Process for the preparation of 4,4'-bis[benz(ox, othi or imid)az

Details Process for the preparation of 4,4'-bis[benz(ox, othi or imid)az Process for the preparation of 4,4'-bis[benz(ox, othi or imid)az

1983-04-25

1985-04-02

Hollrah, Glennon H.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548219, 548175, 548328, C07D41310, C07D41710

Patent

active

045089035

ABSTRACT:
A process for the preparation of 4,4'-bis[benz(ox, othi or imid)azol-2-yl]stilbenes of the formula ##STR1## in which R, R.sup.1, R.sup.2 and R.sup.3 are identical or different and denote hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkoxycarbonyl, chlorine, bromine, nitro or sulfo and X denotes oxygen, sulfur or NH, by reacting alkyl (4-halomethyl)iminobenzoates of the formula ##STR2## or their HCl or HBr salts, R denoting C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxyethyl and X denoting Cl or Br, with o-aminophenol, o-aminothiophenol or o-phenylenediamine and allowing the 2-benz(ox, othi or imid)azol-4-ylhalomethylbenzenes obtained thereby to react with an approximately equivalent amount of sodium tert.-butylate. The stilbene compounds obtained thereby are used as optical brighteners.

REFERENCES:
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patent: 3501490 (1970-03-01), Maeder
patent: 3565890 (1971-02-01), Tanaka
patent: 3586673 (1971-06-01), Bloom et al.
patent: 3641044 (1972-02-01), Matter
Elderfield, Ed., vol. 5, Heterocyclic Compounds, Wiley, N.Y., N.Y., (1957), p. 507.
Khim. Geterotsikl. Soedinenii, 1981, 17:463-467, (Vernigor et al.).

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