Preparation of alkoxy(iso)violanthrenediones

Details Preparation of alkoxy(iso)violanthrenediones Preparation of alkoxy(iso)violanthrenediones

1988-09-19

1989-11-21

Raymond, Richard L.

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

Organic compounds

Polycyclo ring system containing anthracene configured ring...

C07C 322

Patent

active

048820954

ABSTRACT:
A process for the preparation of bisalkoxy(iso)violanthrenediones involves alkylating the corresponding bishydroxyl compounds in an organic reaction medium with methyl benzoate as the reaction medium.
The ester can easily be regenerated and is stable under the reaction conditions.

REFERENCES:
patent: 2042414 (1936-05-01), Sobatzki et al.
patent: 2140455 (1938-12-01), Howell
patent: 2503823 (1950-04-01), Huber et al.
patent: 4110355 (1978-08-01), Bloom
patent: 4307022 (1981-12-01), Vallette
BIOS 987, pp. 69-70, Indanthrene Brilliant Green B and FFB.

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