Intermediates, procedure for their preparation and their use in the synthesis of vitamins A and E

摘要

preparation of new intermediates, vitamins a and e are dihalogu00e9no acetals of methyl - 3 - hydroxy - 3 (or 6 of hexanal with hydroxy 3 methyl 3 - 5 al bed or bed 3 hydroxy 3 methyl 5.;these intermediaries are condensed and dehydration after deshydrohalogu00e9nation beta ionone or directly on the 2-methyl - hept-2-ene one 6 to synthesize vitamins a and e, respectively.