Ricardo F Schumacher et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 19(39), 13059-13064 (2013-09-17)
Copper(II) halide mediated cyclization of homopropargyl chalcogenides gave three types of chalcogenophene derivatives. Selective product formation was achieved by controlling solvent, temperature, and atmosphere. By using CuBr2 and 1,2-dichloroethane at room temperature under ambient atmosphere, 4-bromo dihydroselenophene derivatives were obtained