An improved procedure for p-isopropylbenzoic acid;

The yield of p-isopropylbenzoic acid was up to 93% under above conditions.

Using SnCl4·5H2O as catalyst, isopropanol and p-hydroxybenzoic acid as raw materials, isopropyl p-hydroxybenzoate was prepared via direct esterification.

p-isopropyl benzoic acid,which is used as manufacturing intermediate for an anti-diabetes drug,Nateglinide,has been synthesized by selective oxidation of p-cymene.

1,1,3,4,4,6-hexamethyl-1,2,3, 4-tetrahydronaphthalene (HMT), an intermediate for Tonalide, is synthesized from p-cymene and 2,3-dimethyl-1-butene.

By the action of Ni-Cu catalyst,the mixture of terpinene and citrene was converterd to p cymene in a fixed bed intergral reactor at reaction temperature of 300-500 ℃ and operating pressure of 9-11 Pa.

Separation and determination of ρ-cymene and α-Terpinene in Jing Hua Wei Kang materials and capsules by RP-HPLC;