the present invention will be described in more detail by way of examples but it should not be construed to be limited thereto in examples crystalline nematic phase transition point and nematicisotropic phase transition point are abbreviated to cn point and ni point respectively trans 4 pentylcyclohexanecarbonitrile 200 g 1 1 mol anhydrous ethanol 77 g 1 7 mol and toluene 200 ml were introduced into a reactor purged with nitrogen gas and agitated at 5 u00b0 c followed by passing hydrogen chloride gas through the mixture until it was saturated with the gas further agitating it in a nitrogen current at room temperature for 3 days adding anhydrous ethanol 2 l to the reaction mixture cooling it down to 5 u00b0 c then passing ammonia gas therethrough with stirring under cooling until it was saturated with the gas further agitating the resulting material at room temperature in nitrogen current for 5 days filtering the reaction mixture and concentrating the filtrate in an evaporator under reduced pressure to obtain trans4 pentylcyclohexanecarboxamidine hydrochloride 239 g 1 0 mol this trans 4 pentylcyclohexanecarboxamidine hydrochloride 69 g 0 30 mol and dimethyl methoxymalonate 48 g 0 30 mol were added to a solution of sodium methylate 56 g 1 0 mol dissolved in anhydrous methanol 1 l followed by heating the mixture under reflux with stirring for 5 hours thereafter cooling the resulting material mixing it with 6n hydrochloric acid 500 ml agitating the mixed liquid at room temperature for 20 minutes filtering the liquid under suction through.