Abstract
The photochemical decomposition of (PhCH 2) 3SnMe and (PhCH 2) 3SnCl has been investigated by steady-state and time-resolved chemically induced nuclear polarization (CIDNP) 1H spectroscopy of the methylene protons using 308 nm pulses of an excimer laser and a 250 MHz NMR spectrometer. From the sign of the polarization it is concluded that (PhCH 2) 3SnMe reacts like other comparable tin compounds via triplet radical pairs; the CIDNP effects are not influenced by the solvent. In contrast the CIDNP effects of (PhCH 2) 3SnCl are solvent dependent: in C 6D 6 the polarization is accounted for by a singlet radical pair precursor, while in CDCl 3 both singlet and triplet radical pairs are formed. The formation of singlet radical pairs during the reaction of (PhCH 2) 3SnCl in C 6D 6 may be interpreted as evidence for stannylene formation.
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