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1857 W. A. Miller Elements Chem. III. 307 Many of the nitro-acids obtained in this manner are yellow, and yield salts which have a yellow colour.

1955 Jrnl. Chem. Soc. 3446 The cis- nitro-acid..on reduction gives about equal quantities of cis- and trans-amino acid, thus indicating that some stereomutation occurs during reduction.

1992 J. March Adv. Org. Chem. (ed. 4) xi. 628 The mechanism is illustrated for the case of β-keto acids, but it is likely that..α-cyano acids, α-nitro acids, and β,γ-unsaturated acids behave similarly.