4-halogenostilbene derivatives and processes for their preparati

Details 4-halogenostilbene derivatives and processes for their preparati 4-halogenostilbene derivatives and processes for their preparati

1984-10-03

1990-04-17

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitriles

546255, 549563, 560 8, 560 81, 568325, 568661, 570184, 564161, C07C12150, C07C 6976, C07D30308

Patent

active

049182153

ABSTRACT:
Novel compounds of the formula ##STR1## and processes for their preparation are described. X represents bromine or iodine and R.sub.1, R.sub.2 and R.sub.3 have the meaning indicated in the patent claim. The compounds (I) are valuable intermediates for the preparation of fluorescent brighteners of the divinylstilbene type.

REFERENCES:
patent: 3542847 (1970-11-01), Drinkard
patent: 3869500 (1975-03-01), Kominami et al.
patent: 4108887 (1978-08-01), Fleck et al.
patent: 4317782 (1982-03-01), Eckstein et al.
patent: 4380514 (1983-04-01), Seybold
patent: 4440694 (1984-04-01), Bellus et al.

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