Abstract
The 13C n.m.r.
spectra of nine heptoses and of all of the heptuloses
were recorded and most of the signals were assigned. From these spectra, the
equilibrium compositions of the heptoses and heptuloses
were determined in aqueous solution. Those of the heptoses differ, with one
exception, little from those of the homomorphous hexoses
but some heptuloses occur wholly in the α-pyranose form, and others are predominantly in furanose forms.
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