Chemiluminescence-promoted oxidation of alkyl enol ethers by NHPI under mild conditions and in the dark
作者:T.E. Anderson、Alexander A. Andia、K.A. Woerpel
DOI:10.1016/j.tet.2020.131874
日期:2021.2
The hydroperoxidation of alkyl enolethers using N-hydroxyphthalimide and molecular oxygen occurred in the absence of catalyst, initiator, or light. The reaction proceeds through a radical mechanism that is initiated by N-hydroxyphthalimide-promoted autoxidation of the enolether substrate. The resulting dioxetane products decompose in a chemiluminescent reaction that allows for photochemical activation
Acetalization of Heptanal over Al-SBA-1 molecular sieve
作者:K. Venkatachalam、M. Palanichamy、V. Murugesan
DOI:10.1016/j.catcom.2010.09.019
日期:2010.12
Al-SBA-1 (Si/Al = 40 80 and 120) and Al Mg-SBA-1 (Si/(Al + Mg)= 40 and 80) molecular sieves were synthesized and characterized Acetalization of n-heptanal with methanol was studied under autogenous pressure between 80 and 150 C Since protonation of n-heptanal was fast addition of methanol to the same formed hemiacetal slowly whereas conversion of hemiacetal to acetal was fast The catalysts exhibited nearly similar conversion irrespective of their difference in acidity and all of them showed more than 80% conversion either at 80 or 100 C Hence It is evident that the difference in acidity is not so Important in differentiating the activity of the catalysts The large pore size and hydrophilic and hydrophobic properties are suggested to be the main factors that control acetalization (C) 2010 Elsevier BV All rights reserved