abstract |
Cpds. of formula:- A and B can be substd, are produced from corresp. cpd. having subst. -OR (R = alkyl) by acid treatment to hydrolyse -OR to -OH, or by acylating a cpd. of formula (Z), bond is H with a cpd. producing the gp. Y or by re-arranging the cpd. of formula: (Z), OH is OY, bond is H[. |