title: Autocatalytic alkyne cycloadditions: evidence for colloidal Pt catalysis.
abstract: Treatment of the four-membered platinacycle L2Pt(1,8-naphthalendiyl) (1) or the five-membered platinacycle L2Pt(1,12-triphenylendiyl) with excess PhCCPh at 120-150 degrees C gives the coupling products 1,2-diphenylacenaphthalene or 4,5-diphenylbenzo[e]pyrene and the alkyne complex L2Pt(eta2-PhCCPh). Both reactions show an accelerating rate, which has been traced to catalysis of the reaction by colloidal platinum formed by the reaction of O2 with L2Pt(eta2-PhCCPh).
authors.affiliation: Department of Chemistry, University of Missouri, 125 Chemistry Building, Columbia, Missouri 65211, USA.
authors.forename: Rowshan Ara
authors.initials: RA
authors.lastname: Begum
authors.forename: Nripen
authors.initials: N
authors.lastname: Chanda
authors.forename: T V V
authors.initials: TV
authors.lastname: Ramakrishna
authors.forename: Paul R
authors.initials: PR
authors.lastname: Sharp
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D002384:Catalysis; D003102:Colloids / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*
chemical_list: D000480:Alkynes; D003102:Colloids; D010984:Platinum