ambo-

prefix designating chiral compounds in which both of the possible molecular configurations are present at an indicated chiral centre or residue but not necessarily in equimolar proportions. Such situations may arise especially with chiral compounds obtained by partial chemical synthesis from chiral precursors in asymmetric reactions. Examples: the amino-acid sequence Phe-ambo-Ala-Leu, representing a mixture of Phe-Ala-Leu and Phe-d-Ala-Leu; and the trivial name 4′-ambo-8′-ambo-α-tocopherol, representing a synthetic α-tocopherol in which C-2 has the natural, (R)-, configuration and C-4′ and C-8′ have both (R)- and (S)-configurations though not necessarily in equimolar proportions. Compare DL-, RAC-.

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