situated on opposite sides of the uncoordinated CC double bond. Complex 2a is in equilibrium with its isomer 4a, which shows dynamic NMR behavior on the NMR time scale. Reactions in a 3:1 molar ratio give rhodacyclopentanes, Ar = C6H5; 5b, Ar = C6H4F-p) as the main product. Complex 5a is also obtained from reaction of phenylallene with 2a. Reactions of (4-fluorophenyl)allene with RhCl(PEt3)3, RhClP(i-Pr)3}2
苯丙二烯和(4-
氟苯基)
丙烯与[Rh(μ-Cl)(
PMe 3)2 ] 2(Rh:arylallene = 1:1)的反
应得到Rh(I)与π配位的芳
丙烯,RhCl(η)的配合物2 -CH 2 C
CHAr)(
PMe 3)2(1a,Ar = C 6 H 5;1b,Ar = C 6 H 4 F- p)。1a,b的X射线晶体学已经在
铑中心周围建立了它们的方形平面配位,该中心键合到芳基
丙二烯的2,3-双键上。
配体的芳基和Rh中心位于未配位的1,2-双键的同一侧。
配体中
苯基的邻
氢位置表明,CH基与Rh中心之间发生了相互干扰的相互作用。1a在
苯中的溶解导致与其异构体3a平衡,该异构体3a在
配体的邻位C-H基团与Rh中心之间没有紧密接触。的1个的温度范围内30-55℃的平衡混合物的1 H NMR光谱得到热力学参数3A ↔1a的ΔH °= -5.0 kJ mol - 1和ΔS °= -8 J mol - 1