Add time:08/30/2019         Source:sciencedirect.com

The conformations of d-glucono-, d-mannono-, d-gulono-, and d-galactono-1,4-lactone in solution were studied by 1H- and 13C-n.m.r. spectroscopy. The two equilibrating, envelope forms [3E(D) and E3(D)] of the lactone ring are weighted strongly in favor of the conformation having the OH-2 group quasiequatorially oriented, except for d-glucono-1,4-lactone. Side-chain CHOHCH2OH groups adopt orientations devoid of unfavorable, 1,3-parallel interactions of OH groups.

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