Process for the chemical separation of racemic modifications of

Details Process for the chemical separation of racemic modifications of Process for the chemical separation of racemic modifications of

1973-10-30

1977-01-25

Raymond, Richard L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260477, 260479R, 260519, C07C 9912

Patent

active

040050882

ABSTRACT:
Racemic Modifications of .alpha.-aminocarboxylic acid derivatives, such as of .alpha.-amino-4-hydroxyphenylacetic acid derivatives, are prepared reliably and more economically than in known processes by reacting the DL-form of the derivative in a solvent with cinchonidine, isolating the precipitated cinchonidine salt and hydrolyzing said salt.

REFERENCES:
patent: 3683015 (1972-08-01), Dyson
patent: 3794655 (1974-02-01), Schubel et al.
patent: 3796748 (1974-03-01), Holdrege
patent: 3860631 (1975-01-01), Gleason et al.
patent: 3869505 (1975-03-01), Palmer
Cordes, Dissertation for Doctor of Philosophy at Polytechnic Institute of Brooklyn, June, 1970, University Microfilms, 313 N. First St., Ann Arbor, Michigan.
Greenstein et al., Chemistry of the Amino Acids, vol. 1, John Wiley & Sons, Inc., New York (1961) pp. 718 and 719.

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