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Aldoses are rapidly epimerized at C-2 in the presence of [Ni(H2O)2(tmen)2]Cl2(tmen =N,N,N′-trimethylethylenediamine) and, of the two C-2 epimers, nickel(II) ions form complexes with only the mannose-type epimers (D-mannose, D-lyxose, and D- or L-rhamnose) stereoselectively.
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Tanase et al. (1986) studied this question.
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