Bulletin de la Société Chimique de France最新文献

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Synthesis and cycloadditions of 1-[(tert-butyldimethylsilyl)oxy]alkenyl isocyanates 1-[(叔丁基二甲基硅基)氧]烯基异氰酸酯的合成及环加成
Bulletin de la Société Chimique de France Pub Date : 1998-09-01 DOI: 10.1002/CHIN.199835113
C. D. Tollenaere, L. Ghosez
{"title":"Synthesis and cycloadditions of 1-[(tert-butyldimethylsilyl)oxy]alkenyl isocyanates","authors":"C. D. Tollenaere, L. Ghosez","doi":"10.1002/CHIN.199835113","DOIUrl":"https://doi.org/10.1002/CHIN.199835113","url":null,"abstract":"1-[(tert-Butyldimethylsilyl)oxy] alkenyl isocyanates 1a and 1b have been conveniently prepared from acetyl or propionyl chloride, silver cyanate and tert-butyldimethylsilyl triflate in the presence of triethylamine. They react with electron-deficient acetylenic dienophiles or with tosyl cyanide to give highly functionalised pyridines or derivatives of uracil or thymine in moderate yields. They also cycloadd with 1-(diethylamino)prop-1-yne, an electron-rich dienophile, to yield glutaconimides and pyridine derivatives.","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80710839","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: 0
Ockham's Razor and Chemistry * 奥卡姆剃刀与化学*
Bulletin de la Société Chimique de France Pub Date : 1997-01-01 DOI: 10.1093/oso/9780199755905.003.0010
R. Hoffmann, V. Minkin, B. K. Carpenter
{"title":"Ockham's Razor and Chemistry *","authors":"R. Hoffmann, V. Minkin, B. K. Carpenter","doi":"10.1093/oso/9780199755905.003.0010","DOIUrl":"https://doi.org/10.1093/oso/9780199755905.003.0010","url":null,"abstract":"Nous commencons par retracer l'histoire personnelle de Guillaume d'Ockham, l'homme qui donna son nom au Rasoir d'Ockham. Ses formulations variees du principe de parcimonie sont presentees. Nous choisissons ensuite un mecanisme de reaction et decrivons une histoire personnelle sur la facon dont le Rasoir d'Ockham est engage dans l'etude d'un tel mecanisme. Une petite histoire des methodologies relatives au Rasoir d'Ockham, les principes de moindre action et de moindre mouvement sont ensuite abordes. L'ensemble est remis dans le contexte de l'acceptation par la communaute chimique (et scientifique) du principe comme etant valable d'un point de vue heuristique. Ce n'est pas le cas, a vrai dire, des attitudes philosophiques actuelles envers le Rasoir d'Ockham. Il s'ensuit un dialogue pour et contre. Nous presentons d'abord la discussion a l'interieur de la chimie, du principe fondamental qui sous-tend le Rasoir d'Ockham, a savoir que le monde est simple. Ensuite nous apportons des arguments qui prouvent, de maniere pragmatique, qu'a plus d'un egard, le Rasoir a son utilite sans avoir a postuler que le monde est simple. En poursuivant l'argumentation, nous nous interessons a la multiplicite et a la continuite des mecanismes de reaction concertes, et a la principale composante de l'analyse bayesienne (deux voies dans lesquelles le Rasoir d'Ockham est implique dans les statistiques modernes). Nous rendons, nous l'esperons, leurs merites aux dangers pour l'imagination chimique d'une adhesion rigide au point de vue du Rasoir d'Ockham, sans perdre de vue les profits qui resultent de l'utilisation de ce principe venerable.","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78733348","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: 115
Ab initio/IGLO 29Si NMR studies of trisubstituted silicenium and silylated arenium ions. Comparison with experimental data of claimed ions 三取代硅和硅化arenium离子的从头算/IGLO 29Si核磁共振研究。声称离子与实验数据的比较
Bulletin de la Société Chimique de France Pub Date : 1995-01-01 DOI: 10.1142/9789812791405_0224
G. A. Olah, G. Rasul, H. Buchholz, Xing-ya Li, G. Prakash
{"title":"Ab initio/IGLO 29Si NMR studies of trisubstituted silicenium and silylated arenium ions. Comparison with experimental data of claimed ions","authors":"G. A. Olah, G. Rasul, H. Buchholz, Xing-ya Li, G. Prakash","doi":"10.1142/9789812791405_0224","DOIUrl":"https://doi.org/10.1142/9789812791405_0224","url":null,"abstract":"Ab initio/IGLO (individual gauge for localized orbital) 29 Si NMR studies of trisubstituted silicenium and their related arenium ions have been carried out. Comparison of the obtained results with the reported experimental data indicate that to date no free long-lived trisubstituted silicenium cations have been observed in solution. The reported results in π-donor arene solvents clearly indicate the formation of silylated Wheland intermediates (arenium ions), whereas in previously discussed heteroatom n-donor solvents (such as ethers or nitriles) the related silylated onium (such as oxonium or nitrilium) ions are formed. At the same time due to the high electrophilicity of trivalent silicon and its affinity for oxygen, halogen, etc, counter ions, such as perchlorate or fluoroantimonates, are also unsuitable for the observation of long-lived trisubstituted silyl cations.","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82233577","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: 0
Multinuclear magnetic resonance study of sterically crowded stannylphosphines and stannylamines : stereochemical influences on chemical shielding and spin-spin couplings 立体拥挤的锡酰膦和锡胺的多核磁共振研究:对化学屏蔽和自旋-自旋耦合的立体化学影响
Bulletin de la Société Chimique de France Pub Date : 1994-01-01 DOI: 10.18419/OPUS-7985
Armin Dörr, D. Gudat, Dieter Hänssgen, H. Hens, E. Stahlhut
{"title":"Multinuclear magnetic resonance study of sterically crowded stannylphosphines and stannylamines : stereochemical influences on chemical shielding and spin-spin couplings","authors":"Armin Dörr, D. Gudat, Dieter Hänssgen, H. Hens, E. Stahlhut","doi":"10.18419/OPUS-7985","DOIUrl":"https://doi.org/10.18419/OPUS-7985","url":null,"abstract":"Multinuclear (1H, 15N, 29Si, 31P, 119Sn) NMR data of sterically crowded acyclic stannylphosphines tBu3SnPHY (Y = H, SnMe3, SntBu3, SiMe3; 1-3, 10), (tBu2RSn)2PH (R = Me, Cl; 4, 5), tBu3SnPY2 (Y = SnMe3, SiMe3; 6, 11), PH(SntBu2PHSntBu3)2 (7), SntBu2(PY2)2 (Y = H, SiMe3, PHSntBu3; 8, 9, 12), cyclic stannylphosphines (tBu2SnPY)n (n = 2, Y = H, C3H6Cl, tBu, SnMe3; 13-16; n = 3, Y = H; 18), (Me2SnPSntBu3)2 (17), and stannylamines tBu3SnNHY (Y = H, SnMe3, SntBu3; 19-21) were obtained by various 1D- and 2D-techniques. 31P- and 15N-shieldings may be explained qualitatively in terms of two counteracting influences, viz electronegativity differences and steric requirements of the substituents. In a similar manner, the trends in one-bond coupling 1KSnP and 1KSnM may be rationalized using a simple model based on the deformation of bond angles by sterically demanding substituents. The signs of long-range couplings 2KSnPH and 1KPSnCCH could be determined, which may be useful for future structural studies. Temperature-dependent effects in the spectra of 13, 18 allow conclusions about the conformational dynamics of the molecules.","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88125645","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: 0
Dioxygen ligand transfer from platinum to molybdenum. Isolation of a highly reactive molybdenum (VI) oxoperoxo dimer 二氧配体从铂转移到钼。高活性钼(VI)氧过氧二聚体的分离
Bulletin de la Société Chimique de France Pub Date : 1993-01-01 DOI: 10.1007/978-1-4615-3000-8_34
H. Arzoumanian, José Sanchez, G. Strukul, R. Zennaro
{"title":"Dioxygen ligand transfer from platinum to molybdenum. Isolation of a highly reactive molybdenum (VI) oxoperoxo dimer","authors":"H. Arzoumanian, José Sanchez, G. Strukul, R. Zennaro","doi":"10.1007/978-1-4615-3000-8_34","DOIUrl":"https://doi.org/10.1007/978-1-4615-3000-8_34","url":null,"abstract":"","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88997612","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: 1
Enantioselective cyclizations of acyclic 1,5-diketones 无环1,5-二酮的对映选择性环化
Bulletin de la Société Chimique de France Pub Date : 1987-09-29 DOI: 10.1002/CHIN.198739126
C. Agami*, N. Platzer, H. Sevestre
{"title":"Enantioselective cyclizations of acyclic 1,5-diketones","authors":"C. Agami*, N. Platzer, H. Sevestre","doi":"10.1002/CHIN.198739126","DOIUrl":"https://doi.org/10.1002/CHIN.198739126","url":null,"abstract":"La methyl-4 heptanedione-2,6 est cyclisee en dimethyl-3,5 cyclohexene-2one. Le remplacement du groupe methyl-4 par un groupe isopropyl ou t-butyl conduit a une baisse importante de l'enantioselectivite","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1987-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91468449","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: 2
Trifluoropyruvic acid hydrate in heterocyclic synthesis: synthesis of trifluoromethylated five, six and seven membered heterocycles with two or more heteroatoms 杂环合成中的水合三氟吡酸:具有两个或更多杂原子的三氟甲基化五、六和七元杂环的合成
Bulletin de la Société Chimique de France Pub Date : 1987-06-30 DOI: 10.1002/CHIN.198726070
M. Mustafa, A. Takaoka, N. Ishikawa
{"title":"Trifluoropyruvic acid hydrate in heterocyclic synthesis: synthesis of trifluoromethylated five, six and seven membered heterocycles with two or more heteroatoms","authors":"M. Mustafa, A. Takaoka, N. Ishikawa","doi":"10.1002/CHIN.198726070","DOIUrl":"https://doi.org/10.1002/CHIN.198726070","url":null,"abstract":"","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1987-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91459861","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: 3
Synthesis of new high molecular weight cyclic fluorocarbons and highly branched fluorocarbons such as perfluoro-3,3-diethylpentane 合成新型高分子量环氟碳化合物和全氟-3,3-二乙基戊烷等高支链氟碳化合物
Bulletin de la Société Chimique de France Pub Date : 1987-06-30 DOI: 10.1002/CHIN.198726099
Hsu-Nan Huang, R. Lagow
{"title":"Synthesis of new high molecular weight cyclic fluorocarbons and highly branched fluorocarbons such as perfluoro-3,3-diethylpentane","authors":"Hsu-Nan Huang, R. Lagow","doi":"10.1002/CHIN.198726099","DOIUrl":"https://doi.org/10.1002/CHIN.198726099","url":null,"abstract":"Synthese par fluoration de methylcyclooctane, cyclodecane, cyclododecane, cyclotetradecane, dipropyl-4,4 heptane, diethyl-3,3 pentane","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1987-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80411686","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: 0
Tetrabutylammonium and polymer-supported dihydrogentrifluoride: new reagents for the hydrofluorination of activated acetylenic bonds 四丁基铵和聚合物负载的三氟二氢:活性乙炔键氢氟化的新试剂
Bulletin de la Société Chimique de France Pub Date : 1987-06-23 DOI: 10.1002/chin.198725096
J. Cousseau, P. Albert
{"title":"Tetrabutylammonium and polymer-supported dihydrogentrifluoride: new reagents for the hydrofluorination of activated acetylenic bonds","authors":"J. Cousseau, P. Albert","doi":"10.1002/chin.198725096","DOIUrl":"https://doi.org/10.1002/chin.198725096","url":null,"abstract":"Fluorhydratation de liaisons acetyleniques activees par des groupes nitrile, ester, cetone ou aldehyde. Obtention des isomeres cis- ou -trans des derives fluoroethyleniques correspondants","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1987-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86436326","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: 0
Reagents and synthetic methods. XXVII: Improved synthesis of 2-substituted benzoxazoles induced by trimethylsilyl polyphosphate (PPSE) 试剂和合成方法。二十七:三甲基硅基聚磷酸酯(PPSE)诱导2-取代苯并恶唑的改进合成
Bulletin de la Société Chimique de France Pub Date : 1984-09-04 DOI: 10.1002/chin.198436190
J. Aizpurua, C. Palomo
{"title":"Reagents and synthetic methods. XXVII: Improved synthesis of 2-substituted benzoxazoles induced by trimethylsilyl polyphosphate (PPSE)","authors":"J. Aizpurua, C. Palomo","doi":"10.1002/chin.198436190","DOIUrl":"https://doi.org/10.1002/chin.198436190","url":null,"abstract":"Synthese de R-2 benzooxazoles par action de R-COOH sur l'amino-2 phenol en presence de PPSE","PeriodicalId":9281,"journal":{"name":"Bulletin de la Société Chimique de France","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1984-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73817458","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: 3
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