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Abstract
Unstable addition compounds of the semiacetal type are formed when cotton cellulose is impregnated with glyoxal solution and dried at room temperature. If the dried impregnated fibre, containing an acid catalyst, is heated so as to bring about full acetalization, the product contains both mono- and di-acetals of glyoxal with cellulose. The free aldehyde groups of the monoacetals can be oxidized to carboxyl by means of chlorous acid or reduced with borohydride, and hydrolysis of the oxidized or reduced material liberates glyoxal from the diacetals. Since the latter can be formed only by reactions involving at least two anhydroglucose units, it is almost certain that cross-linking of the cellulose chains occurs.