During the course of some work on the optical rotations of substituted glucose derivatives, preparations of the a-and@-methylglucosides of 3-methyl-4, 6-ethylideneglucose were required. Catalytic deacetylation with sodium methylate of 16.5 g. of the nonaystalline triacetate, sp. rot.(D line, 25')+ 84'(CHCL, C, 7.8) gave 10.8 g. of a sirupy mixture of methyl 3- methyl-a-and 8-glucosides. This was shaken with 45 ml. of freshly distilled paraldehyde ...
