316 PRACTICAL ORGANIC AND BIO-CHEMISTRY 



" Liquid " terpineol is made from terpin hydrate by treatment with dilute 

 sulphuric acid and is used largely in perfumery. Terpinenol is found in 

 cardamom and majoram oil. Dihydrocarveol has been detected in oil of 

 .kummel. Pulegone is contained in the essential oils of Mentha pulegium and 

 Jiedeoma pulegioides and dihydrocarvone has been found in kummel oil. 



Menthadiene Group. 



H 2 C 

 HO 



Terpinolene, 

 not natural. 



d and Mimonene, 

 d t /-limonene 



or 

 dipentene. 



!H 3 



o-Terpinene 



CH 3 



a-Phellandrene. 



CH 2 



^8-Terpinene, 

 not natural. 



2, 4 A-Menthad f ene, 

 not natural. 



CH 



CH. 



C 



CH 3 



7-Terpinene. 



GH 3 



Carvone. 



