Preparation of D, L-pantolactone

Details Preparation of D, L-pantolactone Preparation of D, L-pantolactone

1976-07-01

1978-04-04

Raymond, Richard L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30732

Patent

active

040827755

ABSTRACT:
The invention relates to a method for the synthesis of D, L-pantolactone by the reaction of (1) of hydroxypivaldehyde with hydrocyanic acid produced in situ followed by (2) hydrolysis of the cyanohydrin obtained. The pantolactone may then be separated from the reaction mixture. Each of the reactions (1) and (2) are conducted under closely controlled conditions of concentration, temperature, pH and time and, by virtue of these conditions, a yield exceeding 90% may be obtained.

REFERENCES:
patent: 2328000 (1943-08-01), Finkelstein
patent: 2852530 (1958-09-01), Ford
patent: 2863878 (1958-12-01), Lynn
Schmidt, et al., C.A. 79:18140m (1973).
Schmidt, et al., C.A. 80: 133230y (1974).
Ishiguro, C.A. 81:169151h (1974).
Yamamoto, C.A. 82:3820w (1975).
Ito, et al., C.A. 82:155390u (1975).

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