to the other two hydroxyl groups to give a compound vii and so as to serve as a leaving group in the following ether bonding reaction next the organic chromophore d is coupled followed by desilylation to afford a compound ix the following scheme 3 illustrates the synthesis path of an optical polymeric compound by incorporation of the organic dye molecular material obtained through the reactions illustrated in scheme 1 or 2 into a polyimide backbone in scheme 3 linear polyimide is used as an optical polymer main chain to incorporate organic chromophore groups as side chains to the polyimide main chain the mitsunobu reaction is accomplished using triphenylphosphine pph 3 and diethyl azodicarboxylate dead the organic chromophore d is a well known organic chromophore with maximum absorption at 350 u02dc 600 nm wavelength the synthesis reactions illustrated in schemes 1 through 3 will be described in greater detail by means of the following examples to a 1 l 2 neck flask containing 400 ml of benzene was added 31 g 0 2 mol of 3 5 dihydroxybenzoic acid 71 g 0 6 mol of 1 6 hexane diol and 1 9 g 10 mmol toluene sulfonic acid as a catalyst and the mixture was vigorously stirred the reactor was equipped with a dean stark apparatus and the benzene was refluxed for about 6 hours while raising the temperature of the reactor using a thermal coil to remove water after sufficiently removing the benzene the organic fraction was dissolved with ethylether neutralized with aqueous sodium hydrogencarbonate and washed several times with water the remaining water was removed from the organic fraction using magnesium sulfate followed by concentration to obtain a white solid compound the resulting solid compound was recrystallized.