_p_-Nitrophenylacetic acid has been formed by the nitration of
phenylacetic acid;[1] by the hydrolysis of its ester[2] or its amid,[3]
and by the hydrolysis of its nitrile with hydrochloric acid.[4]
[1] Ber. 42, 3596 (1909).
[2] Ber. 12, 1765 (1879).
[3] Ber. 14, 2342 (1881).
[4] Ber. 15, 834 (1882).