between 3 8 and 4 25 and at 6 7 ppm to 2 lt of refluxing water 3 ml of 40 aqueous tetrabutylammonium hydroxide 250 ml of salicylaldehyde and 280 ml of trans 1 4 dichloro 2 butene are added while vigorously stirring followed by the dropwise addition of the solution of 83 g of sodium hydroxide in 400 ml of water at such a rate that the ph of the mixture is kept between 7 and 8 ca 25 minutes thereafter the mixture is refluxed for about 6 minutes until the ph is about 7 cooled to 20 u00b0 and the aqueous layer is extracted with diethyl ether the extract is combined with the organic layer washed with 5 aqueous sodium hydroxide dried evaporated the residue distilled and the fraction boiling at 141 u00b0 147 u00b0 0 7 mmhg collected to yield the 2 4 chloro trans 2 butenyloxy benzaldehyde to the solution of 155 7 g thereof in 3 8 lt of methylene chloride 357 g of 85 3 chloro perbenzoic acid are added and the mixture is stirred for one hour and refluxed for 4 days it is cooled filtered and the filtrate washed with methylene chloride and saturated aqueous sodium bicarbonate dried and evaporated below 40 u00b0 to yield the 2 4 chloro trans 2 3 epoxybutyloxy phenyl formate showing nmr peaks at 3 2 3 5 4 1 7 0 and 8 2 ppm to the solution of 229 4 g thereof in 900 ml of methanol is added dropwise 1 1 lt of 10 aqueous potassium hydroxide while stirring under nitrogen and maintaining the temperature between 8 u00b0 and 15 u00b0 after stirring at said temperature overnight and at room.