| 摘要 |
Halogeno-acetals of ethylenically unsaturated aldehydes are prepared by reaction of an ethylenically unsaturated ester with a halogen cation chosen from Cl+, Br+ and I+ and an alcohol. The products are useful, inter alia, for introducing an alpha , beta -ethylenically unsaturated aldehyde unit into a mono- or polyene radical.
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