A novel 2-substituted-1,3-butadiene compound which may be used as a coupling agent is disclosed, i.e. a 2-substituted-1,3-butadiene compound of the general formula (I) ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 independently represent a halogen, a lower alkyl group, or a lower alkoxy group with the exception of those compounds wherein R.sup.1, R.sup.2 and R.sup.3 are all lower alkyl groups.
本发明公开了一种可用作
偶联剂的新型2-取代-
1,3-丁二烯化合物,即一般式(I)的2-取代-
1,3-丁二烯化合物:##STR1## 其中,R1、R2和R3独立地表示卤素、低碳基或低碳氧基,但不包括R1、R2和R3均为低碳基的化合物。