title: Metal-templated diyne cyclodimerization and cyclotrimerization.
abstract: Reaction of [Pt(CH3)2(COD)] (COD = 1,5-cyclooctadiene) with Ph2PCCCCPPh2 led to a mixture of [{Pt(CH3)2}2(mu-Ph2PC4PPh2)2] (1) and [{Pt(CH3)2}3(mu-Ph2PC4PPh2)3] (2). Reaction of [PtCl2(COD)] with Ph2PCCCCPPh2 led to a mixture of the thermally unstable compounds [{PtCl2}2(mu-Ph2PC4PPh2)2] (3) and [{PtCl2}3(mu-Ph2PC4PPh2)3] (4) which transform into [{PtMe2}2{mu-C8(PPh2)4}] (5) and [{PtMe2}3{mu3-C12(PPh2)6}] (6) containing 8-membered diene-diyne and 12-membered triene-triyne rings, respectively. Compound 2 can be converted to [{PtMe2}3{C12(PPh2)6}] (7) by heating with CuCl at 80 degrees C, while 1 can be heated without significant cycloaddition.
authors.affiliation: Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6.
authors.forename: Maria Paz
authors.initials: MP
authors.lastname: Martin-Redondo
authors.forename: Ludmila
authors.initials: L
authors.lastname: Scoles
authors.forename: Brian T
authors.initials: BT
authors.lastname: Sterenberg
authors.forename: Konstantin A
authors.initials: KA
authors.lastname: Udachin
authors.forename: Arthur J
authors.initials: AJ
authors.lastname: Carty