Continuous process for preparing indolenine compounds
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United States of America Patent
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Feb 22, 1994
Grant Date -
N/A
app pub date -
Jul 3, 1991
filing date -
Jul 3, 1991
priority date (Note) -
Expired
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Abstract
Described is a continuous process for preparing indolenine compounds which comprises charging continuously and simultaneously to a reactor containing an acetic acid reaction medium (1) substituted phenylhydrazine and (2) unsymmetrical ketone from separate sources, continuously discharging from the reactor indolenine product in acetic acid solution, separating acetic acid from the indolenine product, recycling separated acetic acid to the reactor, neutralizing residual acetic acid remaining in the indolenine product with aqueous inorganic alkaline reagent, and separating from the indolenine product an aqueous solution of salts resulting from the preparation and neutralization of the indolenine product.
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