Cyclitols characterization

Cyclic stresses/strains, 13 481-483 Cyclic stress-strain curves, 13 491 Cyclic structures, nonaromatic, 15 5 Cyclic thermomechanical characterization, of shape-memory polymers, 22 358-362 Cyclic trimer ketone peroxides, 14 292 Cyclic trioxides, 18 448 Cyclic voltammetry, 9 580 Cyclitols, 4 710 Cyclization(s)... 

Carbohydrates are minor components of wine which contribute to sensorial properties and play and important role in the different reactions occurring during fermentation and aging. Whereas monosaccharides and polyalcohols are rather well-known, more research is necessary on disaccharides, oligosaccharides and non-phenolic glycosides. The presence of cyclitols in wines and wine derivatives can constitute a useful tool to characterize their origin. Among all the studies related to carbohydrates in wine, polysaccharides have been the most important focus in the last years. 

Cyclohexylidene derivatives of 1,2-diob. Whereas 1,2-diols had traditionally been characterized by reaction with acetone to produce the acetonide or isopropylidene derivatives, Micovic and Stojiljkovic recommended conversion of sugars and other polyols into their cyclohexylidene derivatives because of the ease with which these substances crystallize. Angyal et al. explored the behavior of inositol (1) and found that this cyclitol gradually dissolved in a mixture of cyclohexanone and benzene containing p-toluenesulfonic acid on boiling under a Dean-Stark water separator. 

The cyclopentane cyclitols have been characterized by nuclear magnetic resonance. The conformational analysis of cyclopentene and of poly-substituted cyclopentanes has been discussed. 

In addition to the conversion of the three cyclitols to the same bromohy-drins, Muller 46) found further evidence for isomerization. When the reaction mixture from mi/o-inositol or scyllo-mositol was treated with Ba(OH)2, he was able to isolate iso-inositol, which has since been shown to be DL-inositol 107). It is to be noted that inversion of any two adjacent carbon atoms of scyllo-inositol would give DL-inositol, while inversion of any one carbon atom would give m /o-inositol. Inversion of the stereochemically equivalent carbon atoms (number 1) of m /o-inositol would give DL-inositol. Muller also isolated an ill-characterized pseudo-inositol. ... 

A new digalactosyl cyclitol from the seed balls of sugar beet has been characterized as 0,-ef-D-Gal p(l- 6)-0- -D-Gal p(l- 2)-1-D-chiro-A series of cyclitol derivatives (23)-(25) have been... 

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