| abstract |
The invention relates to the β-methylene aldehydes of formula: ##STR1## in which: R 1 and R 2 , which may be identical or different, are chosen from a hydrogen atom and optionally substituted carboacyclic, radicals, n R 3 and R 4 , which may be identical or different, are chosen from a hydrogen atom and optionally substituted carbocyclic, radicals, it not being possible for R 3 and R 4 simultaneously to be a hydrogen atom. n The invention also relates to the use of these compounds for the preparation of compounds of interest, in particular from the retinoid or carotenoid family, and the respective structural analogs thereof. |