Tanasescu and Macovskil have assigned the structure of a 1," 3,(i-di-o-nitrobenzylidene- dulci-tot to a substance which they obtained by condensing o-nitrobenzaldehyde and dulcitol through the agency of 7.5% sulfuric acid. They stated that the behavior exhibited by dulcitol in forming this supposed 1, 2: 3, 6-diacetal was a general property of this hexitol and in their communication they assigned l,?:. 5,(i-diacetal structures to the dimethylene- ...