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Cyclohexannulated [5.3.1]propellanes as precursors to the ABC ring system of paclitaxel (taxolTM) 环己环[5.3.1]推进剂作为紫杉醇ABC环体系的前体
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950001395
M. Banwell, R. Gable, S. Peters, J. R. Phyland
{"title":"Cyclohexannulated [5.3.1]propellanes as precursors to the ABC ring system of paclitaxel (taxolTM)","authors":"M. Banwell, R. Gable, S. Peters, J. R. Phyland","doi":"10.1039/C39950001395","DOIUrl":"https://doi.org/10.1039/C39950001395","url":null,"abstract":"Thermal or silver-ion induced electrocyclic ring-opening of Cyclohexannulated [5.3.1]propellanes such as 7 and 8 provides ABC ring analogues of paclitaxel (taxol) including compounds 10, 11 and 14.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"59 1","pages":"1395-1397"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74291167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Is the most stable gas-phase isomer of the benzenium cation a face-protonated π-complex? 苯阳离子最稳定的气相异构体是面质子化的π配合物吗?
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950002347
M. Glukhovtsev, A. Pross, A. Nicolaides, L. Radom
{"title":"Is the most stable gas-phase isomer of the benzenium cation a face-protonated π-complex?","authors":"M. Glukhovtsev, A. Pross, A. Nicolaides, L. Radom","doi":"10.1039/C39950002347","DOIUrl":"https://doi.org/10.1039/C39950002347","url":null,"abstract":"The recent suggestion, based on gas-phase experimental data, that the most stable isomer of protonated benzene has a face-protonated π-complex structure is not supported by our detailed computations which indicate that the π-complex is a second-order saddle point on the potential energy surface, lying 199 kJ mo–1 higher in energy than the well-established C2vσ-protonated structure.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"5 1","pages":"2347-2348"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74763720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
A new and simple method for the preparation of active Ti-β zeolite catalysts 一种制备活性Ti-β沸石催化剂的简便新方法
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950000023
J. S. Reddy, A. Sayari
{"title":"A new and simple method for the preparation of active Ti-β zeolite catalysts","authors":"J. S. Reddy, A. Sayari","doi":"10.1039/C39950000023","DOIUrl":"https://doi.org/10.1039/C39950000023","url":null,"abstract":"Incorporation of titanium into the framework of zeolite beta was achieved by simply treating Al-β zeolite with an ammonium titanyl oxalate solution followed by air calcinations; the material obtained is a very active catalyst for the epoxidation of olefins.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"96 1","pages":"23-24"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74821155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Induced homolysis of dimethyldioxirane by alkanes and alkyl radicals in oxidation processes. The dramatic role of molecular oxygen and radical inhibitors 氧化过程中烷烃和烷基自由基诱导二甲基二氧环烷均解。分子氧和自由基抑制剂的显著作用
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950001573
A. Bravo, F. Fontana, G. Fronza, A. Mele, F. Minisci
{"title":"Induced homolysis of dimethyldioxirane by alkanes and alkyl radicals in oxidation processes. The dramatic role of molecular oxygen and radical inhibitors","authors":"A. Bravo, F. Fontana, G. Fronza, A. Mele, F. Minisci","doi":"10.1039/C39950001573","DOIUrl":"https://doi.org/10.1039/C39950001573","url":null,"abstract":"The oxidation of alkanes by dimethyldioxirane is dramatically affected by the presence of molecular oxygen and radical inhibitors, supporting the hypothesis of a free-radical mechanism for these extraordinarily selective reactions; the factors affecting the free-radical selectivity are suggested.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"103 1","pages":"1573-1574"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74828490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
New homogeneous rhenium-based metathesis catalysts as models of the rhenium on alumina heterogeneous catalyst 新型均相铼基复分解催化剂作为铼在氧化铝上非均相催化剂的模型
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950000791
D. Commereuc
{"title":"New homogeneous rhenium-based metathesis catalysts as models of the rhenium on alumina heterogeneous catalyst","authors":"D. Commereuc","doi":"10.1039/C39950000791","DOIUrl":"https://doi.org/10.1039/C39950000791","url":null,"abstract":"Bis(2,6-di-tert-butyl-4-methylphenoxy)isobutylaluminium reacts with dirhenium heptoxide to give complexes containing aluminium coordinated with perrhenate and 2,6-di-tert-butyl-4-methylphenoxy ligands which are active new catalysts for the metathesis of alkenes.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"19 1","pages":"791-792"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78705608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Novel intramolecular Michael-type reactions between vinyldiphenylphosphine and pentamethylcyclopentadienyl coordinated to rhodium(III): formation and X-ray structures of heptadentate 10-electron donor ligands 乙烯基二苯基膦与五甲基环戊二烯配位铑(III)之间的新型分子内迈克尔型反应:七齿酸10电子给体的形成和x射线结构
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950001629
L. Barthel-Rosa, V. Catalano, J. H. Nelson
{"title":"Novel intramolecular Michael-type reactions between vinyldiphenylphosphine and pentamethylcyclopentadienyl coordinated to rhodium(III): formation and X-ray structures of heptadentate 10-electron donor ligands","authors":"L. Barthel-Rosa, V. Catalano, J. H. Nelson","doi":"10.1039/C39950001629","DOIUrl":"https://doi.org/10.1039/C39950001629","url":null,"abstract":"The reaction between vinyldiphenylphosphine and [{(η5-C5Me5)RhCl2}2] proceeds via an intramolecular hydroalkyl addition to yield the two isomeric products 1aand 2a.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"40 1","pages":"1629-1630"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76115580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
COS trapping by palladium pyrazolates: addition vs. clathration 吡唑酸钯的COS捕集:加成与包合
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950001955
N. Masciocchi, M. Moret, A. Sironi, G. Ardizzoia, S. Cenini, G. L. Monica
{"title":"COS trapping by palladium pyrazolates: addition vs. clathration","authors":"N. Masciocchi, M. Moret, A. Sironi, G. Ardizzoia, S. Cenini, G. L. Monica","doi":"10.1039/C39950001955","DOIUrl":"https://doi.org/10.1039/C39950001955","url":null,"abstract":"[{Pd(dmpz)2(Hdmpz)2}2](Hdmpz = 3,5-dimethylpyrazole) reacts with COS, both in solution and in the solid state, affording [Pd{SC(O)dmpz}2] and [{Pd(dmpz)2(Hdmpz)2}2]mdot;COS, respectively; the structure of the latter is determined by ab initio methods from conventional X-ray powder diffraction data only.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"30 1","pages":"1955-1956"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74946871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Chemoenzymatic synthesis of analogues of the second messenger candidate cyclic adenosine 5′-diphosphate ribose 第二信使候选环腺苷5′-二磷酸核糖类似物的化学酶合成
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950001359
G. A. Ashamu, A. Galione, B. Potter
{"title":"Chemoenzymatic synthesis of analogues of the second messenger candidate cyclic adenosine 5′-diphosphate ribose","authors":"G. A. Ashamu, A. Galione, B. Potter","doi":"10.1039/C39950001359","DOIUrl":"https://doi.org/10.1039/C39950001359","url":null,"abstract":"A broad substrate specificity for adenosine 5′-diphosphate ribosyl cyclase is demonstrated by cyclisation of ribose-and purine-modified nicotinamide adenine dinucleotide analogues to mimics of cyclic adenosine 5′-diphosphate ribose, generating a straightforward route for structural modification of this important Ca2+-mobilising nucleotide.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"57 1","pages":"1359-1360"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76480511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 22
Excited state electron and energy transfer of a highly fluorescent heterocyclic dye: a laser flash photolysis study of 2,5-dimethyl-3,6-diphenylpyrrolo[3,4-c]pyrrole-1,4-dione 高荧光杂环染料的激发态电子和能量转移:激光闪光光解2,5-二甲基-3,6-二苯基吡咯[3,4-c]吡咯-1,4-二酮的研究
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950000303
V. Srivatsavoy, M. Eschle, J. Moser, M. Grätzel
{"title":"Excited state electron and energy transfer of a highly fluorescent heterocyclic dye: a laser flash photolysis study of 2,5-dimethyl-3,6-diphenylpyrrolo[3,4-c]pyrrole-1,4-dione","authors":"V. Srivatsavoy, M. Eschle, J. Moser, M. Grätzel","doi":"10.1039/C39950000303","DOIUrl":"https://doi.org/10.1039/C39950000303","url":null,"abstract":"The triplet and singlet state properties of the title compound are reported: nitroxyl free radicals and oxygen enhance the triplet yield significantly; electron transfer from the singlet excited state to methyl viologen in acetonitrile produced the corresponding free radicals which recombine with second-order kinetics.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"213 1","pages":"303-304"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76585541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Irreversible rearrangement of half-sandwich ruthenium hydrido-alkynyl complexes to their vinylidene isomers 半夹心钌氢化炔基配合物与偏乙烯异构体的不可逆重排
Journal of The Chemical Society, Chemical Communications Pub Date : 1995-01-01 DOI: 10.1039/C39950001757
I. D. L. Rios, M. J. Tenorio, M. Puerta, P. Valerga
{"title":"Irreversible rearrangement of half-sandwich ruthenium hydrido-alkynyl complexes to their vinylidene isomers","authors":"I. D. L. Rios, M. J. Tenorio, M. Puerta, P. Valerga","doi":"10.1039/C39950001757","DOIUrl":"https://doi.org/10.1039/C39950001757","url":null,"abstract":"The complex [(C5Me5)RuCl(dippe)](dippe = l,2-bis(diisopropylphosphino)ethane) reacts with alk-1-ynes in MeOH in the presence of NaBPh4 yielding the metastable hydrido-alkynyl derivatives [(C5Me5)Ru(H)(CCR)(dippe)][BPh4](R = CO2Me, SiMe3 or Ph), intermediates in the formation of the corresponding vinylidene complexes, to which these compounds rearrange both in solution and in the solid state.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"33 1 1","pages":"1757-1758"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77415794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
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