Where Rr, H,= H, the starting material was phydroxybenzaldehyde (1-7, 36). Where R3= H and R?= F, C'l, Br, CH3 (8-13, 23-29), the starting material waa o-fluorophenol, o- chlorophenol, o-bromophenol, and o-cresol, which were alkylated by means of t'he appropriat'e alkyl halide. The corresponding aldehydes were then obtained either by chloromethylation followed by a Soninielet reaction, or directly by a Rieche reaction'O ( ...
