ELECTROPHILIC SUBSTITUTION IN N-ARYL-2-PYRAZOLINES. 2. REACTIONS WITH ALDEHYDES

Article abstract of DOI:10.1007/BF00513294

Leuco compounds of the triphenylmethane series were obtained by the reaction of 1,3-diphenyl-, 3-methyl-1,5-diphenyl-, 1,3,5-triphenyl-, and 1,5-diphenyl-3-styryl-2-pyrazolines with aromatic and heterocyclic aldehydes.The center of electrophilic attack is the para position of the aromatic ring in the 1 position of the heteroring.