base the reaction scheme is shown below in flow diagram i alternatively oximes of formula ii wherein r 8 is c 1 c 6 alkyl may be prepared by reacting a formula ii compound wherein r 8 is hydrogen with a dialkyl sulfate of formula vi in the presence of a base such as sodium hydroxide or an alkali metal alkoxide the reaction scheme is shown in flow diagram ii formula ii oximes wherein r 8 is c o r 11 may be prepared by reacting a formula ii compound wherein r 8 is hydrogen with an acid chloride of formula vii or an anhydride of formula viii as shown in flow diagram iii formula ii hydrazones may be prepared by reacting a 3 alkoxy 2 propenal of formula iv with a hydrazine of formula ix optionally in the presence of an acid catalyst such as acetic acid the reaction scheme is shown in flow diagram iv 3 alkoxy 2 propenal compounds of formula iv may be prepared according to the procedures described by e breitmaier et al in synthesis pages 1 9 1987 maleimide compounds of formula iii are known in the art and may be prepared according to.