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Type: Artigo de periódico
Title: Cleavage of carbon-carbon bonds in a cyclopropene derivative by platinum complexes
Author: Duarte, RA
Dias, GHM
Ursini, CV
Fujiwara, FY
Lenarda, M
Abstract: The compound 1,2-diphenyl-3-(dicyanomethylene)cyclopropene (TRYA) undergoes carbon-carbon double bond cleavage in reactions with [Pt-3(CNBu(t))(6)] (in 2:1 and 1:1 mel ratios) and [Pt(COD)(2)] (in 2:1 mol ratio), to give the propanediylidenediplatinum complexes [Pt-2{mu 2-(PhC)(2)C=C(CN)(2)} (CNBu(t))(4)] (1a) and [Pt-2{mu 2- (PhC)(2)C=C(CN)(2)} (COD)(2)] (1b) (COD = 1,5-cyclooctadiene). However, ring-opening reactions of TRYA with equimolar amounts of [Pt(PR(3))(C2H4)(2)] (R = Ph, and Cy) lead to the insertion of the platinum into the single carbon-carbon bond, forming dinuclear platinacyclobutenes [PtC(Ph)=C(Ph)C=C(CN)(2)(PR(3))](2) (2a, R = Ph and 2b, R = Cy). Complexes 2a and 2b, treated with 2 and 4 equivalents of CNBu(t), give the related mononuclear platinacyclobutenes [PtC(Ph)=C(Ph)C=C(CN)(2)(PR(3))(CNBu(t))] (3a, R = Ph and 3b, R = Cy) and [PtC(Ph)=C(Ph)C=C(CN)(2)(CNBu(t))(2)] (3c). The reaction of [Pt(COD)(2)] with 1 equivalent of TRYA produces the platinacyclobutene [PtC(Ph)=C(Ph)C=C(CN)(2)(COD)] (3d). Furthermore, the COD ligands are readily displaced from 1b and 3d by the addition of an excess of CNBu(t), to afford 1a and 3c.
Subject: cyclopropene
platinum complexes
Country: Brasil
Editor: Soc Brasileira Quimica
Citation: Journal Of The Brazilian Chemical Society. Soc Brasileira Quimica, v. 7, n. 1, n. 75, n. 81, 1996.
Rights: aberto
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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