| abstract |
Chroman derivatives of the general formula I ##STR1## where A--B is --CH 2 --CH 2 --(Ia), --CH═CH--(Ib), --CHOH--CH 2 --(Ic) or --CO--CH 2 --(Id), R 1 is --CH 2 --O--R' or ##STR2## where R' is C 1 -C 4 -alkyl or arylmethyl and R" and R'" are each C 1 -C 4 -alkyl, which can also be bonded to form a five-membered or six-membered cyclic acetal, R 2 is C 1 -C 4 -alkyl and R 3 is H or a protective group. |