Chemistry of bent bonds. XXVIII. Transition metal complex specificity and sutstituent effects in the transition metal complex promoted rearrangement of phneyl-substituted bicyclo [1.1.0]butanes
Pd(0)-catalyzed cross-coupling of allyl halides with α-diazocarbonyl compounds or N-mesylhydrazones: synthesis of 1,3-diene compounds
作者:Kang Wang、Shufeng Chen、Hang Zhang、Shuai Xu、Fei Ye、Yan Zhang、Jianbo Wang
DOI:10.1039/c6ob00454g
日期:——
With palladiumcatalysis, allyl bromides or chlorides react with α-diazocarbonyl compounds or N-mesylhydrazones to afford 1,3-diene derivatives. The reaction represents a novel and efficient method for the synthesis of 1,3-butadiene derivatives. Mechanistically, the reaction is proposed to follow a pathway involving the formation of a π-allylic palladium carbene complex and subsequent migratory insertion
Effects of ligands on the migratory insertion of alkenes into rhodium–oxygen bonds
作者:Casseday P. Richers、Sven Roediger、Victor Laserna、John F. Hartwig
DOI:10.1039/d0sc04402d
日期:——
Migratory insertions of olefins into metal–oxygen bonds are elementary steps of important catalytic processes, but well characterised complexes that undergo this reaction are rare, and little information on the effects of ancillary ligands on such reactions has been gained. We report a series of alkoxo alkene complexes of rhodium(I) that contain a range of bidentate ligands and that undergo insertion of the
烯烃迁移插入金属-氧键是重要催化过程的基本步骤,但经历该反应的良好表征的配合物很少见,并且关于辅助配体对此类反应的影响的信息很少。我们报道了一系列铑( I )的烷氧基烯烃配合物,其含有一系列二齿配体并且经历了烯烃的插入。我们的结果表明,含有较少供电子辅助配体的配合物比含有较多供电子辅助配体的配合物反应更快,并且具有较大咬角的配体的配合物比具有较小咬角的配体反应更快。外部添加的配体对反应有多种影响,包括抑制产物中的烯烃异构化和加速产物从具有小咬角的辅助配体复合物中的置换。补充计算研究有助于阐明这些插入过程的细节。
Palladium-catalysed reactions of ketenes with allyl acetates or allyl carbonates: novel syntheses of 1,3-dienes and allylated esters
The reaction of arylketenes with allyl acetates of allyl carbonates catalysed by tetrakis(triphenylphosphine)palladium selectively gives 1,3-dienes or allylated esters, respectively, in high yields.
Palladium-complex-catalyzed reactions of ketenes with allylic carbonates or acetates. Novel syntheses of .alpha.-allylated carboxylic esters and 1,3-dienes