SYNTHESES, STRUCTURES, AND REACTIONS OF THE FIRST ROTATIONAL ISOMERS OF STABLE SELENOBENZALDEHYDES, 2,4,6-TRIS[BIS(TRIMETHYLSILYL)METHYL]SELENOBENZALDEHYDES, AND THEIR ETA(1)-TUNGSTEN COMPLEXES

摘要

Deselenation of a cyclic polyselenide mixture, Tbt(s)CHSe(n) 5, resulted in the formation of Tbt(s)CHSe 3a, which gave its head-to-tail dimer 12 upon concentration of the reaction solution although it was stable in a dilute solution. Thermolysis of 12 gave an equilibrium mixture of 12, 3a, and its rotational isomer Tbt(a)CHSe 3b, and 3b was isolated as a solid stable even in air. Reaction of 3a and 3b with W(CO)(5) . THF gave the corresponding eta(1)-selenoaldehyde tungsten complexes 4a and 4b, respectively. Some reactions of 4a were carried out to give products accompanied by decomplexation. (C) 1997 Elsevier Science Ltd. [References: 98]