CYCLIC DIACETAL DERIVATIVE AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain the subject compound easy in handling since it is odorless, excellent in storage stability, producible from inexpensive nonanedial and useful as a cross-linking agent for a hydroxyl group-containing polymer such as PVA. ;SOLUTION: This compound is a cyclic diacetal derivative of the formula [R¹ and R² are each H or a lower alkyl; (n) is an integer of 2-4], and the compound is obtained by reacting (A) 1,9-nonanedial with (C) an aliphatic alkylene glycol (e.g. ethylene glycol) in the presence of (B) an acidic substance (preferably, activated clay or an acidic ion-exchanging resin) and distilling after the addition of (D) a basic substance (e.g. sodium alcoholate or an organic amine) to the reaction mixture. Preferable uses of the components based on 1mol of the component A are as follows: the component B, about 0.001-1mol; the component C, about 2-100mol; and the component D, about 0.001-1mol.;COPYRIGHT: (C)1998,JPO