Helvetica chimica acta
Reactivité de composés carbonylés avec des cétènes en présence d'alkoxydes de titane ou de zirconium. 3e communication
R Hofer, D Evard, A Jacot??Guillarmod
Index: Hofer, Roger; Evard, Daniel; Jacot-Guillarmod, Andre Helvetica Chimica Acta, 1985 , vol. 68, p. 969 - 974
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Citation Number: 3
Abstract
The reaction of ketene or dimethylketene with aldehydes or ketones in the presence of titanium or zirconium alkoxides gives essentially 8-hydroxyesters. By polyinsertion of ketene and aldehydes in the Ti-0 bond, di-, tri-, and tetraesters are formed. An excess of ketene produces acetyl derivatives of esters and 6-alkyl-3, 4, 5, 6-tetrahydro-2, 4-pyrandiones.
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