Tn. Gerasimova et Av. Konstantinova, PREPARATION OF 4-DICYANOMETHYLENE-2-METHYL-6-P-DIMETHYLAMINOSTYRYL-4(H)-PYRAN (DCM), Sibirskij himiceskij zurnal, (1), 1993, pp. 41-42
ylene-2-methyl-6-p-dimethylaminostyryl-4-(H)-pyran (DCM) was prepared
from 2-methyl-6-p-dimethylaminostyryl-4(H)-pyranone-4 and malononitril
e in boiling acetic anhydride. A pure sample obtained in 58% yield by
chromatography on alumina.