Neither during the synthesis from sorbitol and benzaldehyde, nor during hydrolysis experiments, did we encounter another isomer of dibenzylidene-D-sorbitol, such as the one described by Meunier,4 5m. p. 162°. This substance was probably a mixture of diand tri-benzylidene-Dsorbitols.In the experimental part we give improved physical constants of mono-and tri-benzylidene-D-sorbitol and of 5,6-diacetyl-l,3:2,4-dibenzylidene-D-sorbitol. Experimental6 2.4-Monobenzylidene-D-sorbitol.-Vargha8 gives m. p.172-73°, [<*)%> 5.3°. His sample was obviously contaminated with dibenzylidene-D-sorbitol, because he recrystallized from alcohol, in which the latter substance is fairly soluble. We prepared the mono-compound according to his directions, but recrystallized it from 6 parts of water which left the diacetal undissolved. The substance so prepared had m. p. 176-77 °, [a]nD -1.1°( c, 1.0) in water.Anal.• Caled, for Cl3H1806: C8H6CH, 33.33. Found: C6H6CH, 33.1 2.4-Monobenzylidene-D-sorbitol from l,3:2,4-dibenzylidene-D-sorbitol.-Three grams of the diacetal1 was refluxed on the steam-bath with a mixture of 120 ml. 80% alcohol and 67 ml. glacial acetic acid for one hour. The solution was evaporated to dryness under reduced pressure.
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