(C_5H_5)_2NdCl·2LiCl与正丁基锂的反应:[ Li(DME)_3][(C_5H_5)_3Nd(μ-H)Nd(C_5H_5)_3]的合成及其晶体结构

研究了(C5H5)2NdCl.2LiCl与正丁基锂在THF溶液中的反应,并从该反应液中分离到了钕的氢化物[Li(DME)3][(C5H5)3Nd(μ-H)Nd(C5H5)3]1。化合物1经X射线单晶结构测定表明属单斜晶系,空间群P21/c,晶胞参数为:a=0.9670(2)nm,b=2.1001(5)nm,c=2.1279(7)nm,β=90.89(2)°,Z=4,V=4.321(2)nm3,Mr=957.36,Dc=1.47g.cm-3,F(000)=1936,R=0.094,wR=0.100。1的晶胞中包含两个独立的晶体分子,每一分子由阴阳离子对[Li(DME)3]+和[(C5H5)3Nd(μ-H)Nd(C5H5)3]-组成。钕原子与3个η5-C5H5基团配位,且两个(C5H5)3Nd经氢桥键相连构成阴离子。Nd1-H和Nd2-H键长均为0.218(1)nm。

三氯化镱催化丙烯酸酯与呋喃成环反应的研究

The ytterbium chloride catalyzed Diels-Alder reaction of acrylate with furan was studied.The influence of reaction conditions upon the yield and stereoselectivity of the products was discussed emphatically.