Cis-2,5-disubstituted-2,5-dihydrothiofene-1,1-dioxides, generated by a retro Diels-Alder reaction, lead with high stereoselectivity to (E,E)-1,4-disubstituted-1,3-dienes. The efficiency of this method is illustrated by the synthesis of two dienic insect sex pheromones.
                                    通过逆Diels-Alder反应生成的顺式2,5-二取代-
2,5-二氢噻吩-1,1-二氧化物导致高立体选择性生成(E,E)-1,4-二取代-1,3-二烯。该方法的效率通过两种二齿昆虫性信息素的合成来说明。