Reactions and properties of some trimethyleneplatinum(IV) complexes: V. The kinetics and mechanism of formation from arylcyclopropanes |
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| Authors: | Razak J Al-essa Richard J Puddephatt Mohammed A Quyser Charles FH Tipper |
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| Institution: | Donnan Laboratories, The University, Liverpool, L69 3BX Great Britain |
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| Abstract: | The kinetics of the reaction of arylcyclopropanes (4-XC6H4C3H5, X = H, Me, EtO) with either Pt2Cl2(μ-Cl)2(C2H4)2] or {H2)} in tetrahydrofuran to give in each case {H2)}4] and ethylene or cyclopropane, respectively, have been studied. The reactions are essentially first order in both arylcyclopropane and platinum complexes. The order of reactivity follows the series X = EtO > > Me > H, and Pt2Cl2(μ-Cl)2(C2H4)2]> {H2)}4] and the rate is accelerated in polar solvents. Mechanisms in which the arylcyclopropane first coordinates to platinum and then undergoes ring opening reactions are proposed. |
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