6-Aminocaproic acid is prepared by (a) reacting a 5-formylvaleric acid ester with water in the presence of an acid agent at 30 DEG -200 DEG C. and (b) reacting the 5-formylvaleric acid thus obtained with excess ammonia and hydrogen in the presence of a hydrogenation catalyst and of a solvent which is inert under the reaction conditions at 50 DEG -150 DEG C. under superatmospheric pressure.
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