A kind of method for preparing citral

The present invention provides a kind of method for preparing citral, comprises the following steps：The dimethyl butadiene ether of cis/trans isopentene group 3 occurs Claisen and reset, and obtains the hexadiene of 2,4,4 trimethyl, 3 formoxyl 1,5, and Cope rearrangements are carried out afterwards and obtain citral (aldehyde of 3,72,6 octadiene of dimethyl 1).The method includes adding esters in the feed as side reaction inhibitor and plays a part of adjusting reaction rate.This method selectivity is high, and reaction rate is fast, and the whole flow process residence time is 1~15min.