Abstract: Nopol was synthesized from β-pinene,and nopyl acetate was synthesizd from nopol.Nopyl acetate was (oxidized) by acidic aqueous chromic anhydride,and 2 main products were identified by IR,MS,1H NMR and 13C NMR.They are 4-(1-methyl-1-hydroxy-ethyl)-1-cyclohexene-1-ethanolacetate and 4-(1-methyl-1-hydroxyethyl)-1-cyclohexene-1-ethanol.The former was obtained from cleavage of the four-membered ring followed by hydration,which was the main product of 50%-60% GC content of all the products.The latter was the hydrolyzate of the former.Several other products with comparatively high GC content,mainly 3 groups of isomers have been identified by GC-MS.They are (2,3-)epoxynopyl acetate,1-hydroxy-2,3-epoxynopyl acetate and 5-hydroxy-2,3-epoxynopyl acetate.Results suggested that the four-membered ring of nopyl acetate cleaved first,then hydrated.Other products were mainly obtained from epoxidation of the double bond,and further oxidation of tertiary hydrogen on C-1and C-5.