AN ESR INVESTIGATION ON GROUP IVB ORGANOMETALLOXY- AND ORGANOMETALTHIO-PYRYL AND THIAPYRYL RADICALS

Article abstract of DOI:10.1016/0040-4020(80)88030-6

The spin adducts of triphenylsilyl, triphenylgermyl and triphenylstannyl radicals with γ-pyrone, γ-thiopyrone, thia-γ-pyrone and thia-γ-thiopyrone have been studied by ESR spectroscopy.The spectral parameters indicate that these radicals adopt the conformation where the O-M or S-M bonds are eclipsed with the 2p_z orbital of the γ-carbon, despite the absence of hindering substituent groups in proximity of the radical centre.The electronic effects of sulphur and oxygen on the spin density distribution are also discussed.