| abstract |
The present invention relates to compounds of formula (I) wherein R 1 signifies a C 1 -C 15 alkyl moiety or a C 2 to C 18 alkenyl moiety, to their process of production as well as to their use in organic synthesis, especially as intermediates (building blocks) in the synthesis of vitamin A or β-carotene or derivatives thereof, or other carotenoids, e.g. canthaxanthin, astaxanthin or zeaxanthin, preferably vitamin A. |