Experimental
vapor pressures, vaporization, fusion and sublimation
enthalpies of a number of dialkyl benzenedicarboxylates have been
examined by correlation gas chromatography (CGC) experiments in order
to identify a series of experimental measurements that appear to be
internally self-consistent. The compounds studied in this regard include
dimethyl phthalate dimethyl terephthalate, dimethyl isophthalate,
diethyl phthalate, dibutyl phthalate, and bis(2-ethylhexyl)
phthalate. New vaporization enthalpies and liquid vapor pressure equations
(T/K = 298.15 to 550) of several other compounds
are reported also evaluated by CGC experiments. The compounds, the
vaporization, fusion, and sublimation enthalpies and liquid and solid
vapor pressures evaluated are summarized in Table 22 of the text.
The profound effect of substituents at C-5 of glycosyl sialosides on their stereoselectivity is well-known although the exact nature of this effect is somewhat less understood. Presented herein is a comparative study of a range of novel sialyl donors with various O-substituents. It is demonstrated that O-substituents at C-4 and C-7 may also have a significant effect on the reactivity of sialyl donors and on the stereoselectivity of chemical sialylation.
The first synthesis of the repeating unit of S. aureus capsular polysaccharide type 8 is described. The repeating unit is an unusual trisaccharide sequence of three uncommon sugars, all connected via 1,2-cis linkages. The synthetic trisaccharide was equipped with capping methyl groups at the points of propagation of the polysaccharide sequence.
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