| 摘要 |
NEW MATERIAL:A compound of formula I (R1 is 1-10C alkyl and alkoxy; R2 is cyano, 1-10C alkyl). EXAMPLE:6-Pentyloxy-2-(5-propyl-2-pyrimidinyl)-1,2,3,4-tetrahydronapht halene. USE:A component of liquid crystal composition: it shows good compatibility to other liquid crystal compounds and the use of a small amount added can lower the driving voltage of liquid crystal display elements. PREPARATION:6-Substituted-1,2,3,4-tetrahydronaphthalene-2-carbonitrile of formula II is allowed to react with gaseous hydrogen chloride in an alcohol solvent to form a compound of formula III and the product is allowed to react with gaseous ammonia in an alcohol solvent to give an amidine hydrochloride derivative of formula IV. The condensation reaction of the compound with an acrolein derivative of formula V is carried out in the presence of a base catalyst such as sodium hydroxide to give the compound of formula I .
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