of the biphenolate ligands. Neophylidene and neopentylidene complexes were found to have predominantly the syn conformation in solution. The [syn]/[anti] equilibrium constant for Mo(N-Aryl)(CHR)[Biphen] complexes increased in magnitude with decreasing size of the arylimido ligand, and decreased upon reducing the steric bulk of the alkylidene substituent. The rates of exchange of syn and anti isomers
分两步制备了两个3,3'-二烷基-5,5',6,6'-四甲基-1,1'-
联苯-2,2'
-二醇(其中烷基= t -Bu,
金刚烷基),并将其拆分作为薄荷醇
磷酸酯衍
生物。将每种双
酚盐的双
钾盐加到各种Mo(N-芳基)(CHR)(OTf)2(
DME)络合物中,生成Mo(N-芳基)(CHR)(双
酚盐)类型的外消旋和对映纯化合物。syn -Mo(N-2,6- i -Pr 2 C 6 H 3)(CHCMe 2 Ph)[(S)-Biphen]和syn -Mo(N-2-CF 3 C 6)的X射线晶体学研究H 4)(CHCMe 3)[(S)-Biad](
吡啶)证明了双
酚盐
配体的绝对立体
化学。发现新叶叉烯和新戊叉基络合物在溶液中主要具有顺式构象。Mo(N-芳基)(CHR)[Biphen]配合物的[syn] / [anti]平衡常数随芳基
酰亚胺配体尺寸的减小而增加,并随着亚烷基取代基的空间体积的减小而减小。通过单参