Abstract
Exchange reactions between ( E)-2-dimethyl(chloro)stannyl-3-diethylboryl-2- butene ( 1) and various trimethyl(organyl)stannanes ( 2, 3) have been studied. If the organyl group R is Ph, C 5H 5, 2-thienyl or 3-thienyl ( 2a–d), then the exchange process is accompanied by numerous side reactions. In this case, reaction of 1 with the corresponding organyl lithium compounds is preferable. However, if the organyl group is an alkynyl group (CCt-Bu, CCSiMe 3, CCSnMe 3) ( 3) the elimination of Me 3SnCl leads to new stannacyclopentadienes carrying different substituents. The products are characterized by 1H, 13C, 11B, 29Si, and 119Sn NMR spectroscopy.
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