FIELD: organic syntheses. SUBSTANCE: invention is connected with chemistry of heterocyclic compounds and, in particular, with synthesis of 2-(2-furyl)- 1,3-dioxalane - intermediate reagent in organic synthesis and substance possessing biological activity. Method consists in that ethylene glycol interacts with furfurol in benzene medium in presence of acid catalyst with 444 value in water 2-3 in proportion 1:1:(0.0002-0.0006), respectively. Known method of preparing acetals of furan series is based on using mildly acting acid catalysts, such as cation-exchange resins because of acidophobity of furan aldehydes. However, this catalyst efficiently accelerating reaction in its beginning loses its activity because of covering its surface with resinification products of furan compounds. It results in retardation of reaction and therefore reaction does not go to the end. Hence low yield - 54%. For that reason, known method employing sulfocation-exchange resin in weight proportion to furfurol 1:5 is low effective. Advantage of method of invention is using more effective catalyst with higher furolane yield (82%) and with no need of additionally adding catalyst and without catalyst filtration step. The method has been approved on large-scale installation with annual productivity 500-1000 kg of product. EFFECT: enhanced efficiency of catalyst.
