Abstract
A series of mono-substituted cyclopropanes have been shown to displace ethylene from [(C2H4)PtCl2]2 with formation of substituted (propane- 1,3-diyl)PtCl2 derivatives, displacement being impeded or inhibited by electron withdrawing substituents. From the 1H n.m.r. spectra of the bis-pyridine derivatives (RC3H5)PtCl2(py)2 it is shown that insertion occurs preferentially into the less substituted cyclopropane bond when R = n-C6H13, PhCH2, o-NO2C6H4, or Ph, but for R =p-MeC6H4 the principal product arises from insertion into the more substituted bond in the cyclopropane. trans-1,2-Diphenyl- and trans-1-methyl-2-n-butyl-cyclopropane undergo insertion of PtCl2 into the less substituted cyclopropane bond, but cis-1-methyl-2-n-butylcyclopropane and bicyclo[4,1,0]heptane are preferentially isomerised to olefins. 1,2-Dicyclopropylethane yields a bis-PtCl2 derivative.
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More From: Journal of the Chemical Society, Dalton Transactions
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