摘要:
The reaction of di(t)butyldichlorostannane with 5 equivalents of magnesium leads to 1,1,2,2,3,3,4-hepta-(t)butyl-4-(chloromagnesio)-tetrastannacyclobutane 1. A mechanism of this reaction is proposed. 1 is structurally characterized by 1D and 2D (119)Sn NMR experiments. New monofunctionalised four membered cyclostannanes could be obtained by derivatisation of 1. X-Ray analysis of 1,1,2,2,3,3,4-hepta-(t)butyl-4-methyl-tetrastannacyclobutane 2 and 1,1,2,2,3,3,4-hepta-(t)butyl-4-chlorpropyl-tetrastannacyclobutane 5 show bent ring systems with folding angles about 157 degrees. (C) 2009 Elsevier B.V. All rights reserved.