n propyl isopropyl n butyl sec butyl ter butyl n pentyl neopentyl n hexyl or the like in one embodiment c 1 6 alkyl of r 3 r 4 and r 7 may preferably be yl ethyl n propyl isopropyl n butyl sec butyl or ter butyl in other embodiments r 1 may be c 6 22 aryl or c 6 10 aryl such as phenyl naphthyl acenaphthylenyl anthranyl phenanthryl or the like c 6 22 aryl may optionally comprise a c 1 12 alkyl substituent which may not only be one of the exemplary groups of the above mentioned c 1 6 alkyl but also may be the group such as heptyl octyl nonyl decyl undecyl dodecyl and the isomer thereof in one embodiment c 6 10 aryl of r 5 and r 6 may be phenyl or naphthyl and preferably phenyl in other embodiments c 6 10 aryl may optionally comprise a c 1 6 alkyl substituent which may be one of the exemplary groups of the above mentioned c 1 6 alkyl in one embodiment n represents two groups bound to phenylene of the repeated unit may link to the benzene ring in a ortho meta or para position to one another preferably two groups are linked to in a para position to one another in one embodiment the imidazole derivative comprising a vinyl group is synthesized by the following method providing the aromatic dione compound of formula a aniline and the arylcarboxaldehyde compound comprising the vinyl group of formula b in an acidic condition such as acetic acid via cyclic condensation to obtain the.