A New Method for the Preparation of δ-Alkoxy-α,β-unsaturated Aldehydes and Polyenals
- 1 May 1977
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 50 (5) , 1161-1168
- https://doi.org/10.1246/bcsj.50.1161
Abstract
Dienoxysilanes (2) react with acetals in the presence of TiCl4 and also in the coexistence of TiCl4 and Ti(OiPr)4 to give δ-alkoxy-α,β-unsaturated aldehydes (3–5) in good yields. In the presence of 1,8-diazabicyclo[5.4.0] undec-7-ene or 1,5-diazabicyclo[4.3.0]non-5-ene and molecular sieves 3A or 4A, the elimination reaction of δ-alkoxyl group of α,β-unsaturated aldehydes (3–5) proceeds smoothly to afford the corresponding polyenals in good yields.Keywords
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