76558-18-4Relevant academic research and scientific papers
AN ELECTRON SPIN RESONANCE STUDY OF THE EFFECT OF THE CYCLOPENTADIENYL LIGAND ON THE PROPERTIES OF TIN(III) RADICALS AND THEIR ADDITION PRODUCTS
Davies, Alwyn G.,Hawari, Jalal A. A.
, p. 221 - 231 (1980)
A series of cyclopentadienyltin(III) radicals have been prepared by the reaction: Bu4-nCpnSn Bu3-nCpnSn-radical+Cp-radical.The substitution reactions of these radicals with alkyl bromides, and their addition reactions with ethylene, biacetyl, 3,6-di-t-butyl-1,2-benzoquinone, and nitrocompounds, have been studied by ESR spectroscopy.The apparent reactivity decreases as the number of Cp ligands increases, and in this, and in the ESR parameters of the Sn(IV) adducts which are formed, the Cp ligands resemble chloro groups rather than alkyl groups.This is supportedby the quadrupole splitting which is observed in the Moessbauer spectra of alkylcyclopentadienyl tin compounds.In η1-Sn(IV) compounds this effect may be ascribed to carbon-metal hyper-conjugation (?-?-interaction), but as yet there is no evidence whether CpSn(III) radicals are ?(η1) or ?(η2-5) bonded.
