制备了一系列的三(三乙基膦)-连接的有机铑(I)配合物,并研究了它们与电子贫芳基腈和二芳基酮的反应。[(PEt 3)3 Rh(Ar)](Ar =苯基(1a)或邻-茴香基(1e))与过量的电子贫芳基Ar'C≡N(Ar'= p -CF 3 C 6 H 4或3,5-bis(CF 3)C 6 H 3)形成Rh(I)亚氨基络合物{(PEt 3)3 Rh [N═C(Ar)(Ar')]}(2h - j) 。相反,3,5-bis(CF 3)C 6 H 3 CN没有插入芳基铑(I)配合物[(PEt 3)3 Rh(Ar)](Ar = p -CF 3 C 6 H 4(1f)或3, 5-双(CF 3)C 6 H 3(1g)),含有更多的贫电子芳基。腈插入的动力学数据与涉及初始配体解离,随后经典的迁移插入的途径最一致。亚胺基络合物2i - j在较高温度下通过β-芳基消除而分解,同时电子侧差的芳基3,5-双(CF 3)C
Steric and Electronic Effects Influencing β-Aryl Elimination in the Pd-catalyzed Carbon–Carbon Single Bond Activation of Triarylmethanols
作者:James R. Bour、Jacob C. Green、Valerie J. Winton、Jeffrey B. Johnson
DOI:10.1021/jo302592g
日期:2013.2.15
An analysis of the palladium-catalyzed activation of carbon–carbonsingle bonds within triarylmethanols has led to a greater understanding of factors influencing the β-aryl elimination process responsible for C–C bond cleavage. A series of competition reactions were utilized to determine that β-aryl elimination of aryl substituents containing ortho-substitution proceeds with significant preference
Protolytic defluorination of trifluoromethyl-substituted arenes
作者:Anila Kethe、Adam F. Tracy、Douglas A. Klumpp
DOI:10.1039/c0ob01276a
日期:——
Bronsted superacids. The products from these reactions suggest the formation of reactive electrophiles, such as carbocations, acylium cations or equivalent electrophilic species. As such, Friedel-Crafts-type reactions occur between these species and arene nucleophiles. NMRstudies were done, and the results suggest the formation of an acyl group from the trifluoromethyl groups in the superacid.