Studies in vacuum-ultraviolet photochemistry. Part II. 2,2,4-Trimethylpentane

Abstract

2,2,4-Trimethylpentane has been photolysed at 123·6 and 147 nm at substrate pressures of 1–55 Torr, and conversions of 0·02–0·4%. Use of radical scavenging techniques show the existence of three molecular primary C₈H₁₈→ i-C₄H₈+ i-C₄H₁₀(i), → CH₄+ C₇H₁₄(ii), → C₃H₆+ neo-C₅H₁₂(iii), C₈H₁₈→ Me + C₇H₁₅(iv), → Bu^t+ Buⁱ(v), → Prⁱ+ neo-C₅H₁₁(vi) processes (i)–(iii). In addition to processes (i)–(iii), radical processes (iv)–(vi) also occur. Deactivation of the excited molecular and radical primary products is incomplete, and secondary fragmentation reactions occur.