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The starting material can be obtained according to the procedure of A. R. Todd and F. Bergel, J. Chem. Soc. 1937, 365 by reaction of p-n-heptyloxybenzamidine hydrochloride with α-ethoxymethylene-α-cyanoacetic acid ethyl ester and sodium ethylate in ethanol and then with sodium hydroxide solution. The resulting 5-cyano-4-hydroxy-2-(4-n-heptyloxphenyl)-pyrimidine (melting point 180.8° C; smectic up to 231.5° C. (clearing point)) is treated with phosphorus oxychloride to give 4-chloro-5-cyano-2-(4-heptyloxyphenyl)-pyrimidine having a melting point of 133.3°-134.6° C.

1. customThe starting material can be obtained