Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Patent
1985-03-21
1987-08-04
Torrence, Dolph H.
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
558404, 558406, 560 11, 560 41, 560 81, 562429, 562449, 562488, 564156, 568 34, 570184, C07C12166, C07C 69616
Patent
active
046847448
ABSTRACT:
Stilbene derivatives of the formula ##STR1## wherein X is chlorine or bromine, R.sub.1 is hydrogen, carboxyl, cyano, C.sub.1 -C.sub.6 -alkyl or a non-chromophorically esterified carboxyl group, and R.sub.2 and R.sub.3 independently of one another are each hydrogen, unsubstituted or non-chromophorically substituted C.sub.1 -C.sub.6 -alkyl or C.sub.3 -C.sub.4 -alkenyl, or a non-chromophoric substituent of the 2nd order.
They are valuable intermediates for producing optical brighteners of the 4,4'-disubstituted stilbene series.
REFERENCES:
patent: 4108887 (1978-08-01), Fleck et al.
patent: 4145362 (1979-03-01), Brepoels et al.
patent: 4196229 (1980-04-01), Fleck et al.
patent: 4440694 (1984-04-01), Bellus et al.
Artz Klaus
Meyer Hans R.
Reinehr Dieter
Weber Kurt
Ciga-Geiby Corporation
Fishman Irving M.
Mansfield Kevin T.
McC. Roberts Edward
Torrence Dolph H.
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