abstract |
FIELD: organic chemistry. SUBSTANCE: method involves coupling of diazotized methanylic acid with resorcinol-formaldehyde resin at mass ratio (0,88-0,98): 1, respectively, at 8-12 C and at pH 5,505,9. Yield of dye is 90-93,4% . EFFECT: enhanced yield of dye. 1 tbl |