Metallation of 2-(alkenyl)pyridines by rhodium(III)
作者:Robert J. Foot、Brian T. Heaton
DOI:10.1039/dt9790000295
日期:——
Metallation of 2-(CHR2CR1)py (py = pyridine) occurs on reaction with [Rh2X6(PBun3)4] to give [[graphic omitted]R2CR1)py}X2(PBun3)2](R1,R2= H or Me; R1= H, R2= Ph or C6H4OMe-p; X = Br or Cl). The stereochemistry of these products has been established by n.m.r. measurements and the mechanism of these reactions is discussed. The reaction of [R[graphic omitted]HCH)py}Br2(PBun3)2]. with the excess of HBr
与[Rh 2 X 6(PBu n 3)4 ]反应生成2-(CHR 2 CR 1)py(py =吡啶),得到[R 2 CR 1 ] py} X 2(PBu)n 3)2 ](R 1,R 2 = H或Me; R 1 = H,R 2 = Ph或C 6 H 4 OMe- p; X = Br或Cl)。这些产物的立体化学已经通过核磁共振测量确定,并讨论了这些反应的机理。[R H] py} Br 2(PBu n 3)2的反应。HBr过量会导致[Rh 2 Br 6(PBu n 3)4 ]的重整,而等摩尔量的HBr则不会发生反应。与溴反应产生不寻常的取代,得到[H CBr] py} Br 2(PBu n 3)2 ]。
Rhodium-catalyzed coupling reactions of ?- or ?,?-substituted vinylpyridines with alkenes via C?H bond activation
作者:Yeong-Gweon Lim、Jung-Bu Kang、Kieseung Lee、Yong Hae Kim
Isomerisation of 2-(alkenyl)pyridines by Group 6 metals
作者:Brian T. Heaton、David J. A. McCaffrey
DOI:10.1039/dt9790001078
日期:——
hexacarbonyls and [M(CO)4(nbd)](M = Cr, Mo, or W; nbd = norbornadiene) are described. Isomerisation of the alkenyl side chain occurs with 2-(CR1MeCR2)-, 2-(CH2CR1CH2CH2)- and 2-(CH2CHCH2CH2CH2)-C5H4N (R1, R2= H or Me) to give complexes of the type [M(CO)4L][L = 2-(prop-2′-enyl)- or 2-(substituted prop-2′-enyl)-pyridine] which have, in some cases, also been prepared directly from L; L is always bidentate