Flash Vacuum Pyrolysis of Acetylenic Esters: A Mechanistic Study

Publication date: Available online 30 January 2020Source: Journal of Analytical and Applied PyrolysisAuthor(s): Nouria A. Al-Awadi, Asaad S. Mohamed, Osama M. Habib, Fatma H. Al-Awadhi, Nader A. Al-Jalal, Yehia A. IbrahimAbstractProducts from flash vacuum pyrolysis of eleven acetylenic esters are reported in this study. The mechanism of their pyrolysis is proposed based on the products isolated. These reveal a combination of two main mechanistic approaches. Esters with β-hydrogens favor a retro-ene reaction via a six-membered transition state, the absence of such β-hydrogen leads to a carbene intermediate followed by insertion and cyclization.Graphical Abstract

Source: Journal of Analytical and Applied Pyrolysis - January 30, 2020 Category: Chemistry Source Type: research