The selective formation of antimony‐carbon bonds via organic superbase catalysis under metal‐ and salt‐free conditions is reported. This novel approach utilizes electron‐deficient stibine, Sb(C6F5)3, to give upon base‐catalyzed reactions with weakly acidic aromatic and heteroaromatic hydrocarbons access to a range of new aromatic and heteroaromatic stibines, respectively, with loss of C6HF5. Also, the significantly less electron‐deficient stibines, Ph2SbC6F5 and PhSb(C6F5)2 smoothly underwent base‐catalyzed exchange reactions with a range of terminal alkynes to generate the stibines of formulae PhSb(C≡CPh)2, and Ph2SbC≡CR [R = C6H5, C6H4‐NO2, COOEt, CH2Cl, CH2NEt2, CH2OSiMe3, Sb(C6H5)2], respectively. These formal substitution reactions proceed with high selectivity as only the C6F5 groups serve as a leaving group to be liberated as C6HF5 upon formal proton transfer from the alkyne. Kinetic studies of the base‐catalyzed reaction of Ph2SbC6F5 with phenyl acetylene to form Ph2SbC≡CPh and C6HF5 suggested the empirical rate law to exhibit a first‐order dependence with respect to the base catalyst, alkyne and stibine. DFT calculations support a pathway proceeding via a concerted σ‐bond metathesis transition state, where the base catalyst activates the Sb‐C6F5 bond sequence through secondary bond interactions.
Synthesis and characterization of some new mixed pentafluorophenyl organoantimony(III and V) derivatives
作者:Sanjeev K. Shukla、A. Ranjan、A.K. Saxena
DOI:10.1016/j.poly.2005.09.027
日期:2006.4
Abstract Some new mixed triorganoantimony(III) compounds bearing pentafluorophenyl and hydrocarbon based organic groups of the type R 2 R′Sb (where R = C 6 F 5 , R′ = CH 3 , C 6 H 4 CH 3 - p , C 6 H 5 ; R = C 6 H 5 , R′ = C 6 F 5 ) were synthesized using either appropriate organomagnesium halide and pentafluorophenylantimony(III) chloride or pentafluorophenylmagnesium bromide and organoantimony(III)
摘要一些带有五氟苯基和R 2 R'Sb型烃基有机基团的新型混合三有机锑(III)化合物(其中R = C 6 F 5,R'= CH 3,C 6 H 4 CH 3-p,C 6 H 5; R = C 6 H 5,R′= C 6 F 5)是使用合适的卤化有机镁和氯化五氟苯基锑(III)或溴化五氟苯基镁和氯化有机锑(III)合成的。这些衍生物与卤素(Br,Cl)进行氧化加成反应,生成相应的三有机锑(V)二卤化物。这些化合物的范霍夫系数'i'和摩尔电导数据表明,它们本质上是单体的且不导电。通过元素分析,IR,NMR(1 H,13 C和19 F)和FAB质量分析对化合物进行表征。
Pentafluorophenyl derivatives of phosphorus, arsenic, and antimony and their complexes with rhodium, palladium, and platinum
作者:R. D. W. Kemmitt、D. I. Nichols、R. D. Peacock
DOI:10.1039/j19680002149
日期:——
2, or 3) have been prepared in high yield by an improved method using pentafluorophenyl-lithium. The reactions of these ligands with various rhodium, palladium, and platinum compounds have been investigated and displacement reactions indicate that the complexes L2PtCl2 increase in stability in the order of ligands (L), Me2S < (C6F5)3P < (C6F5)Ph2As < (C6F5)2PhP < tris(2,6-di-fluorophenyl)phosphine <
化合物(C 6 F 5)n Ph 3- n X(X = P,As或Sb;n = 1、2或3)已通过使用五氟苯基锂的改进方法高产率制备。已经研究了这些配体与各种铑,钯和铂化合物的反应,置换反应表明,配合物L 2 PtCl 2的稳定性按配体(L)的顺序增加,Me 2 S <(C 6 F 5)3 P <(C 6 F 5)Ph 2 As <(C 6 F 5)2 PhP <三(2,6-二氟苯基)膦<环辛-1,5-二烯