1,4-Diselenine synthesis by Diels–Alder reaction of a novel exocyclic 1,2-diselone: X-ray crystal structure of (5,6-dimethoxycarbonyl-1,4-diselenine-2,3-dithiolate)Ni(dppe) [dppe = 1,2-(Ph2P)2C2H4]

Abstract

The salt (NBu₄)₂[Zn(dsit)₂] 6 has been converted into the polymer (C₃S₃Se₂)_n 7 which is a source of the reactive 1,2-diselone 8, trapping of which with dimethyl acetylenedicarboxylate affords the 1,4-diselenine derivative 9, which is subsequently transformed into the 1,4-diselenine-2,3-dithiolate species 11, characterised by the X-ray crystal structure of a nickel complex 12.