Disproportionation‐combination ratios of small alkyl radicals formed by the mercury‐photosensitized hydrogenation of olefins in the gas phase

摘要: Disproportionation-combination ratios have been obtained for small alkyl radicals produced in the mercury-photosensitized hydrogenation of ethylene, propylene, butene-1, butene-2, and isobutene. For conditions favoring thermalized radicals, kd/kc (ethyl, ethyl) = 0.14, (isopropyl, isopropyl) 0.69, n-propyl) 0.41, (2-butyl, 2-butyl) 0.77, n-butyl) 0.45, (t-butyl, t-butyl) 3.1. The results are consistent with (n-propyl, 0.15 (n-butyl, 0.14. general agreement between these disproportionation-combination those where photolytic radical sources used indicates that under appropriate conditions, H atom addition to olefins is a suitable source study may be especially useful larger which clean precursors not available.