Pyrazoline compounds

Details Pyrazoline compounds Pyrazoline compounds

1992-11-30

1994-05-03

Willis, Jr., Prince

Compositions

Organic luminescent material containing compositions

Optical brightening compositions

252 87, 252 875, 25230121, 8109, 811558, C09K 1106

Patent

active

053085450

ABSTRACT:
The invention relates to pyrazoline compounds of formula ##STR1## wherein R.sub.1 is hydrogen or methyl, R.sub.2 and R.sub.3 are each independently of the other methyl, ethyl or hydroxyethyl, R.sub.4 is hydrogen or chlorine, R.sub.5 and R.sub.6 are each independently of the other hydrogen or methyl, R.sub.7 is hydrogen, methyl or phenyl, n is 0 or 1, with the proviso that, if n is 0 and R.sub.4 to R.sub.7 are hydrogen, R.sub.2 is methyl and R.sub.3 is hydroxyethyl, and X.sup..crclbar. is a C.sub.1 -C.sub.3 alkanoate, C.sub.1 -C.sub.4 alkanephosphonate, C.sub.1 -C.sub.4 alkanesulfonate, phosphite, sulfamate or glycolate anion and, if R.sub.1 is methyl, X.sup..crclbar. is also a methosulfate, chloride or bromide ion, to the preparation of said compounds, to the use thereof as fluorescent whitening agents, and to novel hydrazine intermediates of formula ##STR2## wherein R.sub.2 and R.sub.3 are methyl, ethyl or hydroxyethyl, and the acetone hydrazones and salts thereof.

REFERENCES:
patent: 3852275 (1974-12-01), Domergue et al.
patent: 3925367 (1975-12-01), Boehmke et al.
patent: 4263431 (1981-04-01), Weber et al.
patent: 4432886 (1984-02-01), Meyer
17 Organikumo 237-238, VEB Deutscherverlag der Wissenschaften, Berlin (1988).
Houben-Weyl, vol. XI(2), pp. 205-206, F. Moller, Elimierung der Amino Gruppe (date unknown).
Hoober-Weyl, vol. XI(1), p. 990, F. Moller, Amine durch Spaltung (date unknown).

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