Abstract
p-Nitrophenylserine butyl ester when reduced with calcium borohydride, gave a compound which could have had structure A, B, or C. Spectropolarimetric, IR and NMR evidence indicated structure IV, a calcium boroxazolidine related to A. A zwitterionic boroxazolidine II was synthesized from threo-1- p-nitrophenyl-2-aminopropane-1,3-diol and ethyl borate.
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