The favorable positions for borate ester formation of ascorbic acid are 3,5-OH groups which yields a 6-membered ring, even though 13B NMR chemical shifts of the borate ester of ascorbic acid suggested the existence of a 5-membered ring.
N. Obi, M. Katayama, J. Sano, Y. Kojima, Y. Shigemitsu and K. Takada, New J. Chem., 1998, 22, 933 DOI: 10.1039/A804680H
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