group hexyloxycarbonyl group and benzyloxycarbonyl group examples of the olefinic compound represented by the formula 2 include 3 4 diacetoxy 1 butene 3 4 dipropionyloxy 1 butene 3 4 divaleroxy 1 butene 3 4 diisovaleroxy 1 butene 1 cyano 2 propenyl acetate 1 cyano 2 propenyl propanoate 1 cyano 2 propenyl benzoate 1 methoxycarbonyl 2 propenyl acetate 1 methoxycarbonyl 2 propenyl propanoate 1 ethoxycarbonyl 2 propenyl benzoate 1 t butoxycarbonyl 2 propenyl acetate and 1 benzyloxycarbonyl 2 propenyl acetate among them acetates such as 3 4 diacetoxy 1 butane 1 cyano 2 propenyl acetate 1 methoxycarbonyl 2 propenyl acetate 1 t butoxycarbonyl 2 propenyl acetate and 1 benzyloxycarbonyl 2 propenyl acetate are preferable in order to carry out the process of the present invention in an industrial scale the olefinic compound represented by the formula 2 can be produced for example by the following known processes i a process in which 1 3 butadrene is oxidized in the presence of a carboxylic acid see u s pat no 3 723 510 ii a process in which acrolein is converted into the corresponding cyanohydrin and the resulting cyanohydrin is esterified with a carboxylic anhydride such as acetic anhydride propionic anhydride and butanoic anhydride see german patent application laid open no 3634151 and iii a process in which acrolein is converted into the corresponding cyanohydrin the resulting cyanohydrin is solvolyzedwith analcohol such as methanol ethanol propanol isopropanol and butanol and the resulting product is esterified with a carboxylic anhydride such as acetic anhydride propionic anhydride and butanoic anhydride see german patent application laid open no 3634151 the rhodium compound.