摘要:
Compounds of the formula ##STR1## wherein R and R' are alkyl C.sub.1 -C.sub.4 are useful as color formers for pressure- and heat-sensitive copying materials.
摘要:
Ketonimine dyes of the formula selected from: ##STR1## wherein X.crclbar. is a chloride, bromide, thiocyanate, sulfamate, formate, acetate, lactate, hydrogen sulfate or dihydrogen phosphate ion; and ##STR2## wherein Y is a sulfate or hydrogen phosphate ion are hydrosulfite bleachable dyes for paper.
摘要:
Compounds of the formula: ##STR1## wherein R and R.sup.1 are alkyl C.sub.1 -C.sub.4 are useful as color formers for pressure- and heat-sensitive copying materials.
摘要:
A process for the preparation of triphenylmethane compounds by oxidation using as the catalyst a mixture of vanadium and molybdenum in a solvent medium of acetic acid plus a cosolvent.