Method of preparing phthalide

Details Method of preparing phthalide Method of preparing phthalide

1983-01-18

1985-07-09

Fan, Jane T.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30788

Patent

active

045283850

ABSTRACT:
The present invention relates to the hydrogenation of phthalic acid anhydride to phthalide. A nickel catalyst of low nickel content is used as hydrogenation catalyst, and a benzoic acid alkyl ester as solvent. Small amounts of an alkanol can be added to the benzoic acid ester. On the basis of these specific conditions, the formation of by-products such as toluylic or phthalic acids in the hydrogenation is greatly diminished, and phthalide yields are obtained which, if the preferred conditions are maintained, can amount to as much as 90%.

REFERENCES:
patent: 2079325 (1937-05-01), Larchar
patent: 2114696 (1938-04-01), Austin et al.

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