Separation and identification of methyl ethers of D-glucose and D-glucitol by gas–liquid chromatography

Abstract

The separation by gas–liquid chromatography of the methyl ethers of D-glucose and of D-glucitol is described.

Carbon-13 and Proton Nuclear Magnetic Resonance Studies of Cellulose Nitrates

“…A schematic presentation of the eight possible AHG units of a cellulose derivative is presented in Figure 1 along with the standard method of labeling the carbon atoms.11 Only for the case of DS = 3, i.e., complete substitution, does a cellulose derivative normally have all uniformly substituted AHG units designated (2,3,6). The examples are cellulose trinitrate and cellulose triacetate.…”

“…The fractions of monosubstituted AHG units in the cellulose derivative are designated as (2), (3), and (6). Similarly, (2,6) and (2,3) represent the fractions of the disubstituted AHG units.…”

“…(1 + kK3){ 1 + kK6)] = k?K2K3K3/d (5) ( where ( 2), (3), and (6) are the fractions of AHG units with substituents only in the positions named. Similarly, (2,3) designates the fraction of AHG units containing substituents only in the 2 and 3 positions.…”