Synthesis of chrome-complexed dye developers in the presence of

Details Synthesis of chrome-complexed dye developers in the presence of Synthesis of chrome-complexed dye developers in the presence of

1973-11-21

1976-07-20

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260146R, 260208, C09B 4500, C09B 4506, C09B 4516, C09B 4526

Patent

active

039706168

ABSTRACT:
An improved method for preparing a compound of the formula: ##SPC1##
Where each R can be hydrogen, an alkyl substituent, preferably having from 1-6 carbon atoms or an alkoxy substituent preferably having from 1-6 carbon atoms and each R.sup.1 is hydrogen or an alkyl or an alkanol group. R.sup.2 is an alkylene radical having from 1-6 carbon atoms and X represents the atoms to complete a cyclopentyl or cyclohexyl ring.
Metal complexed dyes of the above formula are especially useful in the preparation of photographic image patterns.
The improved feature of the method presented involves the preparation of compounds of formula 1 in the presence of weakly basic anion exchange resins to obtain high yields of especially high purity products.

REFERENCES:
patent: 2708193 (1955-05-01), Pfitzner et al.
patent: 2871232 (1959-01-01), Csendes
patent: 3301845 (1967-01-01), Hosokawa et al.
patent: 3356671 (1967-12-01), Johnson et al.
patent: 3399186 (1968-08-01), Hosokawa et al.
patent: 3551406 (1970-12-01), Idelson

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