- Ruthenium-catalysed selective transetherification of substituted vinyl ethers to form acetals and aldehydes
-
The water-soluble ruthenium allenylidene complex [{RuCl(μCl)(C=C=CPh2)(TPPMS)2}2] Na4 catalyses the selective transformation of substituted linear and cyclic vinyl ethers with MeOH, under mild non acidic conditions, to give acetals, while aldehydes and ketones are obtained in a CHCl3/H2O mixture, which allows for easy recycling of the catalyst. NMR studies showed that the reaction follows a transetherification mechanism rather than simple acid-catalysed hydrolysis. ( Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003).
- Saoud, Mustapha,Romerosa, Antonio,Carpio, Sonia Manas,Gonsalvi, Luca,Peruzzini, Maurizio
-
-
Read Online
- PYROLYTIC TRANSFORMATION OF THE VINYL MONOETHERS OF DIOLS IN THE PRESENCE OF ALKALIS
-
The alkaline pyrolysis of the vinyl monoethers of diols takes place at 170-250 deg C and is accompanied by cycloacetalization (ethylene glycol, 1,3-propanediol), by processes involving cleavage of the C-O bonds (diethylene glycol, 1,4-butanediol), and also by the release of hydrogen, carbon dioxide, methane, ethane, acetylene, and C3 to C5 hydrocarbons.Distillation of ethylene glycol vinyl monoether with potassium hydroxide, sodium hydroxide, and lithium hydroxide can result in explosion as a result of the vigorous and exothermic release of gas.
- Trofimov, B. A.,Oparina, L. A.,Parshina, L. N.,Lavrov, V. I.,Grigorenko, V. I.,Zhumabekov, M. K.
-
p. 1424 - 1428
(2007/10/02)
-