Abstract: Eight chiral thewnotropic liquid crystals in two series of biphenyl compounds were synthesized with an advanced method.The yield of p-alkoxylphenol,an intermediate in the series,is higher by 20 percent than reported,and the approach was improved in the pre-paration of p-chlorobiphenyl which is an important intermediale in the synthesis of biphenyl type liquid crystals.By using these compounds,long temperature range color liquid crystal materials were obtained.