title: Perthio- and perseleno-1,3-butadienes, -but-1-ene-3-ynes, and -[3]-cumulenes: one-step syntheses from 1,4-dilithio-1,3-butadiyne.
abstract: [reaction: see text] Treatment of 1,4-dilithio-1,3-butadiyne (1) with dichalcogenides RSSR or RSeSeR affords dithio- and diseleno-1,3-butadiynes (2, 3), perthio- and perseleno-[3]-cumulenes (4, 5), perthio- and perseleno-1,3-butadienes (6, 7), and/or perthio- and perseleno-but-1-ene-3-ynes (8, 9). The products can be controlled by stoichiometry and temperature, by the presence or absence of oxygen, and by choice of the "R" group. By X-ray crystallography, hexa(methylthio)-1,3-butadiene is highly twisted, with a torsion angle [Phi(CCCC)] of 84.7 degrees and an elongated C(2)-C(3) distance of 1.484(3) A.
authors.affiliation: Department of Chemistry, State University of New York at Albany, Albany, New York 12222, USA. eb801@albany.edu
authors.forename: Eric
authors.initials: E
authors.lastname: Block
authors.forename: Frank
authors.initials: F
authors.lastname: Tries
authors.forename: Chunhong
authors.initials: C
authors.lastname: He
authors.forename: Chuangxing
authors.initials: C
authors.lastname: Guo
authors.forename: Mohan
authors.initials: M
authors.lastname: Thiruvazhi
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Toscano