contain less than 0 10 percent of 2 methyl 2 methylsulfinyl propionaldehyde o methylcarbamoyl oxime sulfoxide by product apparatus the apparatus consisted of 500 ml four necked flask equipped with a thermometer stirrer adapter with two drip tip tubes and a dry ice condenser the two drip tip tubes were connected to separate pumps which regulated the feedrates of the solution and the aqueous peracetic acid solution the reactor was also equipped with a side arm overflow tubing through which the reaction product could be drained as desired into a receiver the reaction temperature in the reactor was maintained at 40 u00b0 41 u00b0 c by a warm temperature bath procedure the 2 methyl 2 methylthio propionaldehyde o methylcarbamoyl oxime solution 29 30 in methylene chloride and 35 aqueous peracetic acid solution were introduced into the reactor at rates of 45 ml hr and 56 ml hr respectively after about 2 hours the accumulated reaction product was allowed to overflow into the receiver kept at 5 u00b0 c through the side drain at 15 minute intervals to maintain a constant volume in the reactor the process was continued in this manner for about 6 hours the sulfone product in the receiver.