OrganometallicsPub Date : 2024-12-23eCollection Date: 2025-01-13DOI: 10.1021/acs.organomet.4c00457
Xin Yu, Toby J Woods, Thomas B Rauchfuss
{"title":"Synthesis of [Fe<sub>2</sub>[(μ-SeCH<sub>2</sub>)<sub>2</sub>NH](CN)<sub>2</sub>(CO)<sub>4</sub>]<sup>2-</sup> and Related Iron Selenoates.","authors":"Xin Yu, Toby J Woods, Thomas B Rauchfuss","doi":"10.1021/acs.organomet.4c00457","DOIUrl":"10.1021/acs.organomet.4c00457","url":null,"abstract":"<p><p>The dianion [Fe<sub>2</sub>[(μ-SeCH<sub>2</sub>)<sub>2</sub>NH](CN)<sub>2</sub>(CO)<sub>4</sub>]<sup>2-</sup> ([<b>2</b>]<sup>2-</sup>) is of interest for the preparation of the selenide analog of the active site of the [FeFe]-hydrogenases. The obvious route for its synthesis by cyanation of Fe<sub>2</sub>[(μ-SeCH<sub>2</sub>)<sub>2</sub>NH](CO)<sub>6</sub> (<b>3</b>) fails for reasons that this paper explains and resolves. We show that CN<sup>-</sup> cleaves Se-C bonds in <b>3</b>. For example, treatment of Fe<sub>2</sub>[(μ-SeCH<sub>2</sub>)<sub>2</sub>NH](CO)<sub>6</sub> with NEt<sub>4</sub>CN followed by CH<sub>3</sub>I gives substantial amounts of Fe<sub>2</sub>(μ-SeCH<sub>3</sub>)<sub>2</sub>(CO)<sub>6</sub>. Authentic [<b>2</b>]<sup>2-</sup> can be obtained by cyanation of Fe<sub>2</sub>[(μ-SeCH<sub>2</sub>)<sub>2</sub>NH](CO)<sub>5</sub>(pyridine). The <sup>77</sup>Se NMR data for [<b>2</b>]<sup>2-</sup> and <b>3</b> are reevaluated and explained. Attempts to prepare Fe<sub>2</sub>[(μ-SeCH<sub>2</sub>)<sub>2</sub>NH](PPh<sub>3</sub>)<sub>2</sub>(CO)<sub>4</sub> (<b>9</b>) by Me<sub>3</sub>NO-induced decarbonylation of <b>3</b> also suffers from degradation of the organoselenium ligand. Complex <b>9</b> was prepared instead by photosubstitution. The protonation of [<b>2</b>]<sup>2-</sup> and [Fe<sub>2</sub>[(μ-SCH<sub>2</sub>)<sub>2</sub>NH](CN)<sub>2</sub>(CO)<sub>4</sub>]<sup>2-</sup> are compared: the selenium compounds are more basic. The structure of [HFe<sub>2</sub>[(μ-SCH<sub>2</sub>)<sub>2</sub>NH](CN)<sub>2</sub>(CO)<sub>4</sub>]<sup>-</sup> was determined crystallographically.</p>","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"44 1","pages":"307-314"},"PeriodicalIF":2.5,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11734109/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OrganometallicsPub Date : 2024-12-23DOI: 10.1021/acs.organomet.4c0047810.1021/acs.organomet.4c00478
Jennifer V. Obligacion*, Ana C. Albéniz and Mio Kondo,
{"title":"Experimental Studies of Reaction Mechanisms in Organometallic Chemistry and Catalysis","authors":"Jennifer V. Obligacion*, Ana C. Albéniz and Mio Kondo, ","doi":"10.1021/acs.organomet.4c0047810.1021/acs.organomet.4c00478","DOIUrl":"https://doi.org/10.1021/acs.organomet.4c00478https://doi.org/10.1021/acs.organomet.4c00478","url":null,"abstract":"","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"43 24","pages":"3087–3090 3087–3090"},"PeriodicalIF":2.5,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OrganometallicsPub Date : 2024-12-20DOI: 10.1021/acs.organomet.4c0044910.1021/acs.organomet.4c00449
Nathan J. Lin, Kelly L. Gullett, Ushindi K. Muna, Ryan Galloway, Matthias Zeller and Suzanne C. Bart*,
{"title":"Breaking and Entering: Diazene Cleavage and Insertion into U(III)–Si Bonds","authors":"Nathan J. Lin, Kelly L. Gullett, Ushindi K. Muna, Ryan Galloway, Matthias Zeller and Suzanne C. Bart*, ","doi":"10.1021/acs.organomet.4c0044910.1021/acs.organomet.4c00449","DOIUrl":"https://doi.org/10.1021/acs.organomet.4c00449https://doi.org/10.1021/acs.organomet.4c00449","url":null,"abstract":"<p >Treatment of trivalent [K(18-crown-6)][U(I)<sub>2</sub>{(Si(SiMe<sub>3</sub>)<sub>2</sub>SiMe<sub>2</sub>)<sub>2</sub>O}] (<b>1-crown</b>) with aryl diazenes generated a series of uranium(IV) species of the form [(THF)U(I)<sub>2</sub>{N(R/R′)Si(SiMe<sub>3</sub>)<sub>2</sub>SiMe<sub>2</sub>}<sub>2</sub>O] (R = R′ = Ph (<b>2-Ph</b>), 4-FC<sub>6</sub>H<sub>4</sub> (<b>2-F</b>), 4-MeC<sub>6</sub>H<sub>4</sub> (<b>2-Tol</b>), 4-OMeC<sub>6</sub>H<sub>4</sub> (<b>2-Mes</b>), and R = 4-MeC<sub>6</sub>H<sub>4</sub>, R′ = Ph (<b>2-TolPh</b>). Activation of an ortho-substituted diazene, (2,4,6-Me<sub>3</sub>C<sub>6</sub>H<sub>2</sub>N)<sub>2</sub> (MesN═NMes), forms <b>2-Mes</b>, [K(18-crown-6)][U(I)<sub>3</sub>{N(Mes)Si(SiMe<sub>3</sub>)<sub>2</sub>SiMe<sub>2</sub>}<sub>2</sub>O] (<b>2-MesKI</b>), and ([K(18-crown-6][U(I)(NMes)(N[Mes]-3,3,5,5-Me<sub>4</sub>2,2,6,6-(SiMe<sub>3</sub>)<sub>4</sub>-tetrasil-3-oxane)]) (<b>3-Mes</b>). The increased sterics of this <i>ortho</i>-substituted substrate slowed insertion, facilitating the observation of <b>3-Mes</b> by in situ NMR spectroscopy. The redox potentials of the aryl diazenes (R–N═N–R′) were studied using cyclic voltammetry to elucidate their electronic contributions toward their reactivity with <b>1-crown</b>. The reaction of <b>1-crown</b> and (<i>Z</i>)-11,12-dihydrodibenzo[<i>c</i>,<i>g</i>][1,2]diazocine is also described, forming the [(THF)U(I)<sub>2</sub>{[N(C<sub>7</sub>H<sub>6</sub>)]<sub>2</sub>Si(SiMe<sub>3</sub>)<sub>2</sub>SiMe<sub>2</sub>}<sub>2</sub>O] (<b>2-diazonine</b>) and {(THF)<sub>2</sub>U(I)<sub>2</sub>[N(C<sub>7</sub>H<sub>6</sub>)]<sub>2</sub>}<sub>2</sub> (<b>4</b>) dimers.</p>","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"44 1","pages":"289–299 289–299"},"PeriodicalIF":2.5,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143085913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OrganometallicsPub Date : 2024-12-19DOI: 10.1021/acs.organomet.4c0044010.1021/acs.organomet.4c00440
Mariia V. Melnik, Vladimir N. Mikhaylov, Alexander S. Novikov, Mikhail A. Kinzhalov, Alexander S. Bunev, Mariya A. Kryukova, Viktor N. Sorokoumov and Irina A. Balova*,
{"title":"Alkynylated Palladium(II) and Platinum(II) Acyclic Diaminocarbene Complexes and Their Intramolecular Cyclization via trans-Chlorometalation","authors":"Mariia V. Melnik, Vladimir N. Mikhaylov, Alexander S. Novikov, Mikhail A. Kinzhalov, Alexander S. Bunev, Mariya A. Kryukova, Viktor N. Sorokoumov and Irina A. Balova*, ","doi":"10.1021/acs.organomet.4c0044010.1021/acs.organomet.4c00440","DOIUrl":"https://doi.org/10.1021/acs.organomet.4c00440https://doi.org/10.1021/acs.organomet.4c00440","url":null,"abstract":"<p >This study presents the synthesis of <i>N</i>-alkynylated acyclic diaminocarbene (ADC) complexes of palladium(II) and platinum(II) and their intramolecular cyclization via <i>trans</i>-chlorometalation. The reactions of propargylamines with <i>bis</i>-isocyanide complexes of Pd(II) and Pt(II) produced the desired ADC complexes in good yields. The NH,NH-diaminocarbene complexes were unstable in solution and underwent intramolecular cyclization into chlorometalated products. These findings provide a novel route to stable <i>N</i>-alkynylated ADC complexes with potential applications in catalysis and medicinal chemistry. The complexes synthesized exhibit promising structural and reactive properties suitable for further exploration.</p>","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"44 1","pages":"268–278 268–278"},"PeriodicalIF":2.5,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143085129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OrganometallicsPub Date : 2024-12-19DOI: 10.1021/acs.organomet.4c0046810.1021/acs.organomet.4c00468
Daniel Y. Zhou, Kelsey S. Zimmerman, Paige M. Gannon, Sebastian M. Krajewski, Werner Kaminsky, Benjamin S. Mitchell* and Alexandra Velian*,
{"title":"Synthesis and Reactivity of Iron and Cobalt Bis(amidophosphine selenide) Complexes","authors":"Daniel Y. Zhou, Kelsey S. Zimmerman, Paige M. Gannon, Sebastian M. Krajewski, Werner Kaminsky, Benjamin S. Mitchell* and Alexandra Velian*, ","doi":"10.1021/acs.organomet.4c0046810.1021/acs.organomet.4c00468","DOIUrl":"https://doi.org/10.1021/acs.organomet.4c00468https://doi.org/10.1021/acs.organomet.4c00468","url":null,"abstract":"<p >We report the synthesis of two metal bis(amidophosphine selenide) complexes, ML<sub>2</sub> (M = Fe, Co; L = SePPh<sub>2</sub>N<sup>(−)</sup>Tol), and investigate their reactivity toward ligand binding and oxidation with oxygen atom transfer reagents, pyridine-<i>N</i>-oxide and mesityl nitrile oxide. The oxidative strength of the reagent dictates the nature of the reactivity: either the ligand is oxidized, leading to the formation of a bimetallic mixed-ligand complex [MLL′]<sub><i>n</i></sub>, (L′ = OPPh<sub>2</sub>N<sup>(−)</sup>Tol), or the metal center is oxidized, resulting in a bimetallic μ-oxo complex [FeL<sub>2</sub>]<sub>2</sub>(μ<sub>2</sub>-O). This study defines a chemical space in which amidophosphine selenide ligands maintain their structural integrity.</p>","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"44 1","pages":"335–339 335–339"},"PeriodicalIF":2.5,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143085290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OrganometallicsPub Date : 2024-12-19DOI: 10.1021/acs.organomet.4c0047010.1021/acs.organomet.4c00470
Krishna Prasad Gnyawali, Mina Son, Donghun Hwang, Nuwan Pannilawithana, Mu-Hyun Baik* and Chae S. Yi*,
{"title":"Scope and Mechanism of the Ruthenium-Catalyzed sp3 C–H Coupling Reaction of 2-Alkylindoles with Enones for the Synthesis of Carbazole Derivatives","authors":"Krishna Prasad Gnyawali, Mina Son, Donghun Hwang, Nuwan Pannilawithana, Mu-Hyun Baik* and Chae S. Yi*, ","doi":"10.1021/acs.organomet.4c0047010.1021/acs.organomet.4c00470","DOIUrl":"https://doi.org/10.1021/acs.organomet.4c00470https://doi.org/10.1021/acs.organomet.4c00470","url":null,"abstract":"<p >The catalytic system consisting of a cationic Ru–H complex <b>1</b> and 3,4,5,6-tetrachloro-1,2-benzoquinone (<b>L1</b>) was found to be highly effective for the dehydrative sp<sup>3</sup> C–H coupling reaction of 2-alkyl substituted indoles with enones to form 2,4-disubstituted carbazole products. The analogous coupling reaction of 2-alkylindoles with linear enones bearing the cyclic olefinic group afforded tetracyclic carbazole products. A normal deuterium kinetic isotope effect was measured from the coupling reaction of 1,2-dimethylindole versus 1-methyl-2-(methyl-<i>d</i><sub>3</sub>)indole with (<i>E</i>)-3-penten-2-one (<i>k</i><sub>H</sub>/<i>k</i><sub>D</sub> = 2.5). The Hammett plot was constructed from the reaction of <i>para</i>-substituted indoles 5-X-1,2-dimethylindole (X = OMe, Me, H, F, and Cl) with 4-phenyl-3-buten-2-one (ρ = −1.6 ± 0.2). The density functional theory (DFT) calculations were performed to obtain a complete energy profile for the coupling reaction. The combined experimental and DFT computational data revealed a detailed mechanistic path that features an initial coupling of indole and enone substrates, the turnover-limiting heterolytic sp<sup>3</sup> C–H activation step, and the subsequent cyclization and dehydration steps. The catalytic method provides an efficient synthesis of carbazole derivatives from the dehydrative sp<sup>3</sup> C–H coupling reaction of readily available indole with enone substrates without employing any reactive reagents or forming wasteful byproducts.</p>","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"44 1","pages":"325–334 325–334"},"PeriodicalIF":2.5,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143085482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OrganometallicsPub Date : 2024-12-18DOI: 10.1021/acs.organomet.4c0041510.1021/acs.organomet.4c00415
Gabriel J. Jobin, Brady J. H. Austen and Marcus W. Drover*,
{"title":"1,4-Diphosphorinane Synthesis at a Cationic Aluminum(III) Center","authors":"Gabriel J. Jobin, Brady J. H. Austen and Marcus W. Drover*, ","doi":"10.1021/acs.organomet.4c0041510.1021/acs.organomet.4c00415","DOIUrl":"https://doi.org/10.1021/acs.organomet.4c00415https://doi.org/10.1021/acs.organomet.4c00415","url":null,"abstract":"<p >Lewis acidic group 13 cations are useful mediators of small-molecule and catalytic reactivity alike. Previous work has elaborated on the use of bulky β-diketiminate Al(III) cations for the cycloaddition and intermolecular coupling of alkene substrates, giving new [Al]–C bonds. Motivated by a desire to prepare aluminum/phosphorus-containing ambiphilic ligands, here we probe the intramolecular reactivity of mono- and diphosphines bearing a pendent alkene group. Despite the drive for Al–P bond formation (as shown by control experiments), reaction of a specialized allyl-appended diphosphine results in rapid cyclization, producing an aluminum-bound 1,4-diphosphorinane (six-membered ring). Together, this contribution offers a complementary route toward this class of molecule and emphasizes the importance of substrate design characteristics such as phosphorus/alkene(β-carbon) linker length to accessing productive cyclization. The subsequent reactivity of this heterocycle, including coordination chemistry with gold(I), are additionally shared.</p>","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"44 1","pages":"148–157 148–157"},"PeriodicalIF":2.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143085390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OrganometallicsPub Date : 2024-12-18DOI: 10.1021/acs.organomet.4c0030410.1021/acs.organomet.4c00304
Finn Kraft, Marcel Sommer, Aleksandr Y. Pereverzev, Jana Roithová*, Thomas Auth* and Konrad Koszinowski*,
{"title":"Dissecting Transmetalation Reactions at the Molecular Level: Aryl Transfer in Copper-Tetraarylborate Complexes","authors":"Finn Kraft, Marcel Sommer, Aleksandr Y. Pereverzev, Jana Roithová*, Thomas Auth* and Konrad Koszinowski*, ","doi":"10.1021/acs.organomet.4c0030410.1021/acs.organomet.4c00304","DOIUrl":"https://doi.org/10.1021/acs.organomet.4c00304https://doi.org/10.1021/acs.organomet.4c00304","url":null,"abstract":"<p >Boron–copper transmetalation reactions are practically important, but their detailed mechanisms remain elusive. To improve our understanding of these transformations, we have analyzed the systems Cu<sup>+</sup>/(BAr<sup>X</sup><sub>4</sub>)<sup>−</sup> (Ar<sup>X</sup> = <i>p</i>-X–C<sub>6</sub>H<sub>4</sub> with X = OMe, Me, H, F, Cl, CF<sub>3</sub>) by a combination of NMR spectroscopy, ESI-mass spectrometry, gas-phase experiments, and quantum chemical calculations. By probing the gas-phase fragmentation of mass-selected adducts of the type [Cu(BAr<sup>X</sup><sub>4</sub>)(BPh<sub>4</sub>)]<sup>−</sup> and [(MeCN)<sub>2</sub>Cu<sub>2</sub>(BAr<sup>X</sup><sub>4</sub>)]<sup>+</sup>, we obtain intimate insight into the microscopic reactivity of these model complexes. In all cases, transmetalation reactions occur, the relative efficiency of which depends on the electronic properties of the aryl groups, the charge of the complex, and the number of solvent molecules bound to the latter. Specifically, electron-rich aryl groups show a higher tendency toward being transferred to copper than their electron-poor counterparts, whereas the addition of individual MeCN molecules diminishes the propensity toward transmetalation. The quantum chemical calculations are essential for the interpretation of the experimental results by providing structural and thermochemical information. The trends derived from the present gas-phase models promise to help in the mechanistic analysis of boron–copper transmetalation in solution.</p>","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"44 4","pages":"547–559 547–559"},"PeriodicalIF":2.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acs.organomet.4c00304","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143473682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OrganometallicsPub Date : 2024-12-18DOI: 10.1021/acs.organomet.4c0041210.1021/acs.organomet.4c00412
Joseph Q. Nguyen, Lauren M. Anderson-Sanchez, Joseph W. Ziller and William J. Evans*,
{"title":"Synthesis and Structure of Silyl-Substituted Bis(cyclopentadienyl) Scandium(III) Halide Complexes","authors":"Joseph Q. Nguyen, Lauren M. Anderson-Sanchez, Joseph W. Ziller and William J. Evans*, ","doi":"10.1021/acs.organomet.4c0041210.1021/acs.organomet.4c00412","DOIUrl":"https://doi.org/10.1021/acs.organomet.4c00412https://doi.org/10.1021/acs.organomet.4c00412","url":null,"abstract":"<p >Despite the importance of bis(cyclopentadienyl) scandium(III) halide complexes as precursors in the development of scandium metallocene chemistry, relatively few examples of this class have been structurally characterized. Since the cyclopentadienyl ring substitution pattern and the halide identity can have a major influence on organoscandium complex synthesis and reactivity, it is critical to have a variety of well-characterized [(C<sub>5</sub>R<sub>5</sub>)<sub>2</sub>ScX]<sub>n</sub> starting materials (R = H, alkyl, silyl; X = halide) available for exploration of this area. To remedy this deficiency, reactions between ScX<sub>3</sub> (X = Cl and I) and 2 equiv of a variety of potassium cyclopentadienide reagents have been examined. This has provided, in good crystalline yield, the compounds [C<sub>5</sub>H<sub>3</sub>(SiMe<sub>3</sub>)<sub>2</sub>]<sub>2</sub>ScI, [C<sub>5</sub>Me<sub>4</sub>(SiMe<sub>3</sub>)]<sub>2</sub>ScI, [C<sub>5</sub>Me<sub>4</sub>(SiMe<sub>2</sub><i><sup>t</sup></i>Bu)]<sub>2</sub>ScI, {[C<sub>5</sub>H<sub>4</sub>(SiMe<sub>3</sub>)]<sub>2</sub>Sc(μ-I)}<sub>2</sub>, {[C<sub>5</sub>H<sub>4</sub>(Si<i><sup>i</sup></i>Pr<sub>3</sub>)]<sub>2</sub>Sc(μ-I)}<sub>2</sub>, and {[C<sub>5</sub>H<sub>3</sub>(SiMe<sub>3</sub>)<sub>2</sub>]<sub>2</sub>Sc(μ-Cl)}<sub>2</sub>, each of which has been characterized by X-ray crystallography, elemental analysis, NMR spectroscopy (<sup>1</sup>H, <sup>13</sup>C{<sup>1</sup>H}, <sup>29</sup>Si{<sup>1</sup>H}, and <sup>45</sup>Sc), and infrared spectroscopy. The study has also revealed the facile cocrystallization of the oxide {[C<sub>5</sub>H<sub>3</sub>(SiMe<sub>3</sub>)<sub>2</sub>]<sub>2</sub>Sc}<sub>2</sub>(μ-O) and hydroxide {[C<sub>5</sub>H<sub>3</sub>(SiMe<sub>3</sub>)<sub>2</sub>]<sub>2</sub>Sc(μ-OH)}<sub>2</sub> impurities from preparations of [C<sub>5</sub>H<sub>3</sub>(SiMe<sub>3</sub>)<sub>2</sub>]<sub>2</sub>ScI using samples of ScI<sub>3</sub> that presumably contain an oxide contaminant.</p>","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"44 1","pages":"137–147 137–147"},"PeriodicalIF":2.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143084998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
OrganometallicsPub Date : 2024-12-18DOI: 10.1021/acs.organomet.4c0043810.1021/acs.organomet.4c00438
Angelika Neitzel, Tobias Ludwig, Dirk Bockfeld, Thomas Bannenberg and Matthias Tamm*,
{"title":"Importance of Ligand Fine-Tuning: Alkyne Metathesis with Molybdenum Alkylidyne Complexes Supported by Phenyl-tert-butoxysilanolate Ligands","authors":"Angelika Neitzel, Tobias Ludwig, Dirk Bockfeld, Thomas Bannenberg and Matthias Tamm*, ","doi":"10.1021/acs.organomet.4c0043810.1021/acs.organomet.4c00438","DOIUrl":"https://doi.org/10.1021/acs.organomet.4c00438https://doi.org/10.1021/acs.organomet.4c00438","url":null,"abstract":"<p >The phenyl-<i>tert</i>-butoxysilanols Ph(<i>t</i>BuO)<sub>2</sub>SiOH and Ph<sub>2</sub>(<i>t</i>BuO)SiOH were prepared and used for the synthesis of the molybdenum 2,4,6-trimethylbenzylidyne complexes [MesC≡Mo{OSi(O<i>t</i>Bu)<sub>2</sub>Ph}<sub>3</sub>] (<b>1</b>) and [MesC≡Mo{OSi(O<i>t</i>Bu)Ph<sub>2</sub>}<sub>3</sub>] (<b>2</b>) from <i>mer-</i>[MesC≡MoBr<sub>3</sub>(dme)] (dme = dimethoxyethane, Mes = 2,4,6-trimethylphenyl). The molecular structures of <b>1</b> and <b>2</b> were determined by X-ray diffraction analysis, revealing a secondary molybdenum–oxygen interaction and a chelating κ<sup>2</sup><i>O</i>,<i>O</i>′ coordination mode of one of the siloxide ligands in the case of <b>1</b>. Treatment of <b>1</b> and <b>2</b> with an excess of 3-hexyne (EtC≡CEt) afforded the corresponding propylidyne (EtC≡Mo) complexes, which are in equilibrium with labile metallacyclobutadiene complexes as evidenced by variable-temperature NMR spectroscopy. Single crystals of [(Et<sub>3</sub>C<sub>3</sub>)Mo{OSi(O<i>t</i>Bu)Ph<sub>2</sub>}<sub>3</sub>] (<b>2-MCBD</b>) have been isolated at low temperature, providing a rare example of a crystallographically characterized molybdenacyclobutadiene. The alkylidyne complexes <b>1</b> (<i>n</i> = 1) and <b>2</b> (<i>n</i> = 2) complete the series of available alkyne metathesis (pre-)catalysts [RC≡Mo{OSi(O<i>t</i>Bu)<sub>3–<i>n</i></sub>Ph<sub><i>n</i></sub>}<sub>3</sub>] (<i>n</i> = 0–3), and their catalytic performance in the metathesis of internal and terminal alkynes was investigated and compared, if available, with the previous members of this series (<i>n</i> = 0, 3).</p>","PeriodicalId":56,"journal":{"name":"Organometallics","volume":"44 1","pages":"255–267 255–267"},"PeriodicalIF":2.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acs.organomet.4c00438","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143085392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}