Phase transfer catalyzed method for prepared oxybisphthalic comp

Details Phase transfer catalyzed method for prepared oxybisphthalic comp Phase transfer catalyzed method for prepared oxybisphthalic comp

1998-12-14

2000-02-22

Davis, Zinna Northington

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548455, 548461, 549241, C07D40500, C07D20902, C07D20948, C07D30777

Patent

active

060282037

ABSTRACT:
Oxybisphthalic compounds such as 4,4'-oxybis(N-methylphthalimide) and 4,4'-oxybis(phthalic anhydride) are prepared from the corresponding nitro- or halo-substituted phthalic compounds by reaction with an alkanoate or carbonate salt in a non-polar solvent and in the presence of a hexaalkylguanidinium salt as phase transfer catalyst. A carboxylic acid such as 4-chlorobenzoic acid may be used as an additional catalyst. Reaction rates and yields are higher than with other phase transfer catalysts.

REFERENCES:
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patent: 4933469 (1990-06-01), Berdahl et al.
patent: 4946985 (1990-08-01), Stults
patent: 5132423 (1992-07-01), Brunelle et al.
patent: 5153335 (1992-10-01), Stults

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