Dimeric cyclic bis(amino)stannylenes and -plumbylenes - a multinuclear magnetic resonance study
作者:Bernd Wrackmeyer、Carin Stader、Klaus Horchler、Hong Zhou、Dieter Schlosser
DOI:10.1016/s0020-1693(00)84846-x
日期:1990.10
5-tetramethyl-1,3,4,5,2λ 2 -diazadisilastannolidines ( 3 ) and -plumbolidines ( 4 ) (alkyl= t Bu ( a ), i Pr ( b ), Et ( c )) and 5,5-dimethyl-1-trimethylsilyl-3-(R)-1,3,2λ 2 -diazastannolidines ( 5 ) and -plumbolidines ( 6 ) (R=Me 3 Si ( a ), i Pr ( b )) have been prepared. In the case of 3b , 4b , 3c and 4c monomer-dimer equilibria exist at room temperature and above. At low temperature ( 3c , 4c ) the mechanism
摘要1,3-二烷基-4,4,5,5-四甲基-1,3,4,5,2λ2-二氮杂二硅锡萘啶酮(3)和-plumbolidines(4)(烷基= t Bu(a),i Pr( b),Et(c))和5,5-二甲基-1-三甲基甲硅烷基-3-(R)-1,3,2λ2-二氮杂锡烷啶(5)和-plumbolidines(6)(R = Me 3 Si(a ),i Pr(b))已经准备好。在3b,4b,3c和4c的情况下,在室温及更高温度下存在单体-二聚体平衡。在低温(3c,4c)下,通过动态1 H和13 C NMR建立分子内重排的机理(环滑移)。杂环5和6是二聚体,其中与较小体积取代基连接的氮原子选择性地优选桥连位置。(6b)2和(1b)2(二聚体1.3-二异丙基-2,2-二甲基-1,3,2,4λ2-二氮杂硅氮杂环丁烷)优选导致各自由两个五或两个四元环构成的二聚体,而不是导致由五个和四元环构成的二聚体。自然丰度15