METHOD FOR PREPARATION OF N-ALKYL-O-ALKYL URETHANES Russian patent published in 2009 - IPC C07C269/00 C07D307/42 C07C271/12 C07C271/16 C07C271/26 

FIELD: chemistry.

SUBSTANCE: invention is related to method for preparation of N-alkyl-O-alkyl urethanes of general formula I: , II, where R, R¹ stand for alkyl groups of normal or branched structure with number of carbon atoms from 1 to 8, arylalkyl or alcoalkyl, and also heterylalkyl groups, which consists in the fact that alcohol R¹OH interacts with symmetrical disubstituted urea II, where R, R¹ have the same meaning that in formula I, at increased temperature, which is characterised by the fact that process is carried out in continuous or periodical mode and additionally tin-organic catalyst is introduced in amount from 0.01 to 1 mole % at the ratio of reagents urea: aliphatic alcohol 1:(1÷60) mole and temperature from 140 to 220°C.

EFFECT: application of this method makes it possible to increase yield of N-alkyl-O-alkyl urethanes of general formula I, process performance at optimal conditions and with reduced time of reaction mass soaking in column.

1 cl, 11 ex