PH dependent quantum yield in the photocyclizations of n-chloroacetyldimethylaminophenethylamines. Use of 1,3-dimethyluracil and cyclopheta-1,3-diene as simple and convenient actinometers from 2537 Å radiation
1977; Elsevier BV; Volume: 18; Issue: 19 Linguagem: Inglês
10.1016/s0040-4039(01)93243-5
ISSN1873-3581
AutoresNaganori Numao, Tatsuo Hamada, Osamu Yonemitsu,
Tópico(s)Organic Chemistry Cycloaddition Reactions
ResumoThe polyynes C6H2, C8H2, C10H2, and C12H2 in n-hexane exposed to 253.6 nm radiation “disappear” much faster in air-free solutions than in solutions in equilibrium with air. These observations suggest that the disappearance is due to reaction of the polyyne molecules in the ground state with a photolytically produced chemical species which in solutions in equilibrium with air is overwhelmingly scavenged by dissolved O2. Although no hydrogenation products were firmly established the most likely chemical is atomic hydrogen.
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