Benzaldehydes of the formula ##STR1## can be obtained by reaction of substituted .beta.-amino-styrenes of the formula ##STR2## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.8, R.sup.9, R.sup.10, m, n and o have the scope of meaning indicated in the description, with oxygen in the presence of a Cu compound in the solution of an aprotic polar solvent at 0.degree.-120.degree. C.
式子##STR1##的
苯甲醛可以通过式子##STR2##的取代.beta.-
氨基
苯乙烯与氧在无极性极性溶剂的溶液中,在存在Cu化合物的情况下,在0℃-120℃的温度下反应获得。其中,R1,R2,R3,R4,R5,R8,R9,R10,m,n和o的含义范围如说明中所示。