Syntheses, structures, and reactions of the first rotational isomers of stable selenobenzaldehydes, 2,4,6-tris[bis(trimethylsilyl)methyl]selenobenzaldehydes, and their η1-tungsten complexes

Article abstract of DOI:10.1016/S0040-4020(97)00550-4

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 η¹-selenoaldehyde tungsten complexes 4a and 4b, respectively. Some reactions of 4a were carried out to give products accompanied by decomplexation.