is as crude product in the next step the above crude product of 4 1 methyl heptyloxy 4 39 hydroxy azobenzene 16 5 g was heated with lauryl bromide 16 g in ethanol in the presence of koh 3 6 g under reflux for 10 hours followed by passing a toluene solution of the product through an alumina chromatographic column and recrystallizing from heptane to obtain 4 39 dodecyloxy 4 39 1 methyl heptyloxy azobenzene this product had a m p c i transition point of 49 u00b0 c and exhibited a monotropic sc i point of 38 u00b0 c further the spontaneous polarization of the metastable sc phase thereof was 20 0 nc cm 2 at 36 u00b0 c 4 39 dodecyloxy 4 39 1 methyl heptyloxy azobenzene 7 g obtained in the above paragraph i was added to a mixed solution of acetic anhydride 80 ml acetic acid 20 ml and 30 hydrogen peroxide 4 g followed by agitating the mixture at about 40 u00b0 c for 7 hours further adding 30 hydrogen peroxide 4 g agitating for 7 hours adding water agitating for 3 hours extracting the resulting material with benzene purifying by passing through an alumina chromatographic column and recrystallizing from ethanol containing ethyl acetate to obtain the objective product 5 2 g this product exhibited a c sc point of 39 5 u00b0 c a sc sa point of 47 8 u00b0 c a sa ch point of 48 2 u00b0 c and a ch i of 50 4 u00b0 c the spontaneous polarization of sc phase metastable state at 24 u00b0 c was 30.