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Glucopyranose, 1,2-anhydro 3-methyl ether

P. C. Wollwage and P. A. Seib, Preparation and proton magnetic resonance spectra of the methyl ethers of l,6-anhydro-/fi)-glucopyranose, J. Chem. Soc. C, (1971) 3143-3155. [Pg.195]

The selectivity of alkylation of 1,6-anhydrohexopyranoses is lower than drat of acylations. The relative rate-constants for the three hydroxyl groups in 1,6-anhydro-jS-D-glucopyranose (6) during methyla-tion with dimethyl sulfate in 19% sodium hydroxide solution689 are k2 ks k4 = 2.5 1 1.8, so that the formation of pure monomethyl or dimethyl ethers of 6 by this method is of little preparative value (compare Refs. 224 and 671). l,6-Anhydro-/3-D-galactopyranose (12) affords mostly the 2,4-di-O-methyl derivative,690 and 2-acetamido-l,6-anhy-dro-2-deoxy-/3-D-galactopyranose is mainly methylated at 0-4 by the... [Pg.84]

See other pages where Glucopyranose, 1,2-anhydro 3-methyl ether is mentioned: [Pg.88]    [Pg.21]    [Pg.251]    [Pg.59]    [Pg.209]    [Pg.207]    [Pg.28]    [Pg.54]    [Pg.79]    [Pg.83]    [Pg.188]    [Pg.170]    [Pg.180]    [Pg.175]    [Pg.222]    [Pg.214]    [Pg.119]    [Pg.66]    [Pg.79]    [Pg.555]    [Pg.301]    [Pg.127]    [Pg.118]    [Pg.110]   
See also in sourсe #XX -- [ Pg.13 , Pg.69 , Pg.70 ]



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