Product yields of stabilized Criegee intermediates in the ozonolysis reactions of cis-2-butene, 2-methyl-2-butene, cyclopentene, and cyclohexene

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2018,（7）
• 页码范围: 850-856
• 页数: 7页
• 语种: 英文

摘要

Cavity ring-down spectroscopy (CRDS) was utilized in combination with chemical titration with sulfur dioxide (SO2) to quantify stabilized Criegee intermediates (sCIs) producedat low pressures (4-20 Torr) in ozonolysis reactions of cis-2-butene,2-methyl-2-butene,cyclopentene,and cyclohexene.The yield of stabilized sCI,acetaldehyde oxide (CH3CHOO),from cis-2-butene ozonolysis decreased with decreasing pressure and reached to 0,05±0.04 at the zero-pressure limit.The nonsymmetric alkene 2-methyl-2-butene produced two stabilized sCIs,CH3CHOO and acetone oxide ((CH3)2COO),and their total yield decreased with decreasing pressure and reached 0.01±0.03 at the zero-pressure limit.For cyclopentene and cyclohexene,the sCI yields were essentially constant near zero,as expected of endocyclic alkenes.The nascent yields of sCI of various alkenes are compared.