Reaction of M(2)(O(t)Bu)(6) (M = Mo, W) with 3 equiv of 2,5-dimethylhexane-2,5-diol (LH(2)) in hexane/THF produces orange crystals of M(2)(&mgr;-L(3))(2), Ia (M = Mo), Ib (M = W), in high yield (80%). Treatment of M(2)(NMe(2))(6) with excess (>8 fold) LH(2) in THF/hexane solution at -20 degrees C produces exclusively green crystals of M(2)(&mgr;-L)(eta(2)-L)(2)(HNMe(2))(2), IIa (M = Mo), IIb (M = W)
M(2)(O(t)Bu)(6)(M = Mo,W)与3当量的2,5-二甲基-2,5
-二醇(LH(2))在己烷/ THF中的反应产生橙色高产率(80%)的M(2)(&mgr; -L(3))(2)晶体,Ia(M = Mo),Ib(M = W)。在-20°C下用过量(> 8倍)LH(2)在THF /己烷溶液中处理M(2)(NMe(2))(6),仅生成M(2)(-mg )(eta(2)-L)(2)(HNMe(2))(2),IIa(M = Mo),IIb(M = W),高收率(75%)。在室温下将IIa和IIb缓慢溶解在
甲苯中,分别缓慢产生Ia和Ib,该过程通过加热(在60摄氏度下t(1/2)= 10分钟)加速。化合物Ia,Ib,IIa和IIb通过(1)NMR,IR,熔点和微量分析进行表征,Ib和IIb也通过X射线晶体学进行表征。在-50摄氏度下向Ia或Ib溶液中添加过量的HNMe(2)在2个月后不