uncoordinated SH function at the dangling arm of the ligand. If the SH functions of a potential tripod ligand are deprotonated the resulting thiolate functions are found to strongly coordinate in compounds such as [η3-CH3C(CH2PPh2)2(CH2S)}(CO)3Mo]– which are obtained as their lithium and sodium salts 6. These highly reactive species may be stabilized by encapsulating their alkali counter ions in cryptands and
三脚架
配体 R C( PPh2)( X)( Y) (1),其中 X,Y =
SA烷基,SBzl 在 –40 °C 下用 Li/NH3/THF 选择性地还原 SBzl 功能,生成 R C( PPh2)( X )( Y) (2) (X, Y =
SA烷基, SH)。在这些混合供体组
配体中,SH 函数是最不配位的,因此 [η2-CH3C( PPh2)(
CH2SEt)( SH)}(CO)4Mo] (5) 是一种稳定的化合物,在
配体的悬臂。如果潜在的三脚架
配体的 SH 官能团去质子化,则发现所得的
硫醇盐官能团在化合物中强烈配位,例如 [η3-CH3C( PPh2)2( S)}(CO)3Mo]– 作为其
锂和钠盐 6. 这些高活性物质可以通过将它们的碱反离子封装在穴状
配体和相应的盐中,用 [2,1,1] 穴状
配体 (7a) 和 [2,