Syntheses of 2.5-dimethoxy-3.4-methylenedioxy- (1g), 2.3-dimethoxy-4.5-methylenedioxy- (1h), and 4.5-dimethoxy-2.3-methylenedioxy-phenole (1i) and their methyl ethers 1j, k and the preparation of 2.3.6-trimethoxy-4.5-methylenedioxy-allylbenzene (1m) and of dl-2-amino-1-(dimethoxy-methylene-dioxyphenyl)-propane derivatives are described. © 1969 Springer-Verlag.