Galactitol , acetyl derivatives

Proton coupling-constants were determined65 for the tri-O-acetyl derivatives of bis(ethylsulfonyl)-a-D-lyxopyranosylmethane [2,6-anhydro-l,l-bis(ethylsulfonyl)-l-deoxy-D-galactitol] (29) and bis(eth-... 

A number of methyl or benzyl ether derivatives of galactitol have been prepared and converted into acetyl derivatives for mass spectral study. HN.m.r. investigation of the product obtained from chloroacetaldehyde diethyl acetal and galactitol (see Vol. 1, p. 46) has shown it to be the 1,3 4,6-di-0-acetal derivative, which on boiling with ethanolic sodium hydroxide yielded the polycyclic acetal-ether (3). ... 

The formation of anhydro-derivatives from alditols under methanolysis conditions has been investigated, and xylltol, D-arabinltol, L-fucitol, D-glucltol, galactltol, 2-acet imldo-2-deoxy -D-galactltol, and the alditol of N-acetyl-neuramlnic acid were prone to anhydride formation, whereas 2-amlno-2-deoxy-D-galactitol... 

The glycal diols (9) and (10) were selectively acetylated at 0-3 yja their dibutylstannylene derivates, and l,5-anhydro-4,6-0-benzylidene-D-galactitol(ll) reacted preferentially at 0-3 with benzoyl or p-toluenesulphonyl diloride in pyridine at -IS C Activation of this position by intramolecular hydrogen bonding is thought to be responsible. ... 

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