Studies on the Syntheses of Piperazines. IV

By the reaction of dialkylaniline and thiophene with 1-formyl- or 1, 4-diformylpiperazine and phosphoryl chloride, the corresponding aldehydes, i.e. 2-thienaldehyde and p-dialkylaminobenzaldehyde, were obtained. The yield of the product was 59-77% when 1, 4-diformylpiperazine was used and 48-55% when 1-fomyl derivative was used, showing the yield to be better in all cases when 1, 4-diformyl derivative was used.