Synthetic, nuclear magnetic resonance and X-ray crystallographic studies of conformations of polyorganophosphorus compounds
作者:Jonathan L. Bookham、William McFarlane、Mark Thornton-Pett
DOI:10.1039/dt9920002353
日期:——
three-bond 31P–31P nuclear spin-spin coupling constants in these vary substantially with the bulk of substituents on or near phosphorus, probably as a result of conformation differences. The structures of (Ph2P)2CHCH2PHPh, (Ph2P)2PCHCH2PH(C6H2But3-2,4,6) and [(Ph2P)2CHCH2]2PPh have been determined by X-ray diffraction and suggest that each of these species adopts a conformation in solution that is
ERH 2(E = P或As; R = Ph,CH 2 CH 2 CN,Bu或C 6 H 2 Bu t 3 -2,4,6)和(Ph 2 P)2 C CH 2或( Ph 2 P)2 C CHR'(R'= H或Me)产生三膦(Ph 2 P)2 CHCHR'ERH和五膦[[Ph 2 P)2 CHCH 2 ] 2 ER和(Ph 2 P)2 CHCH(Me)P(Ph)CH 2 CH(PPh 2)2。其中两个键和三个键的31 P – 31 P核自旋自旋耦合常数随磷上或附近的大部分取代基而显着变化,这可能是由于构象差异造成的。(Ph 2 P)2 CHCH 2 PHPh,(Ph 2 P)2 PCHCH 2 PH(C 6 H 2 Bu t 3 -2,4,6)和[(Ph 2 P)2 CHCH 2 ] 2的结构PPh已通过X射线衍射测定,表明这些物质中的每一个在溶液中均采用与固态相似的构象。