作者:Florian Feil、Christian Müller、Sjoerd Harder
DOI:10.1016/s0022-328x(03)00405-4
日期:2003.10
compounds are less stable and show a higher reactivity and faster initiation of styrene polymerization than the analogue α-Me3Si-benzylcalcium complexes. Intramolecular CH activation in a heteroleptic α-methyl-benzylcalcium complex was observed and the product, a calcium complex with a dianionic alkyl/fluorenyl ansa-ligand, was characterized by crystal structure determination.
α甲基benzylcalcium复合物制备的类似物对α-ME 3为哪些程序进行此前报道的Si-benzylcalcium络合物。均配型双的晶体结构(2-ME 2 N-α-ME-苄基)钙·(THF)2和杂(9-ME 3的Si芴基)(2-ME 2 N-α-ME-苄基)钙·确定了(THF)。对于这两种化合物,仅两种非对映异构体之一结晶。通过可变温度NMR光谱估计手性苄基碳的转化障碍。所述α甲基benzylcalcium化合物是不太稳定的,并显示出更高的反应性和苯乙烯聚合的比类似物更快起始α-ME 3Si-苄基钙络合物。观察到在杂配的α-甲基-苄基钙络合物中的分子内CH活化,并且通过晶体结构测定来表征产物,即具有双阴离子烷基/芴基ansa-配体的钙络合物。