Abstract: Nopol and nopyl ethyl ether were synthesized from β-pinene,and nopyl ethyl ether was oxidized by basic potassium permanganate solution.The results are as follows:(1)The structures of 8 products were identified by GC-MS,they were 2,2-dimethyl-3-(β-ethoxypropionyl)cyclobutanone,cis-2,2-dimethyl-3-(β-ethoxypropionyl) cyclobutaneacetic acid,3-hydroxy-cis-2,2-dimethyl-3-(β-ethoxypropionyl) cyclobutaneacetic acid,1-hydroxy-cis-2,2-dimeth-yl-3-(β-ethoxypropionyl) cyclobutaneacetic acid,2,3-dihydroxy-nopyl ethyl ether,5-hydroxy-2,3-epoxynoyl ethyl ether,1-hydroxy-2,3-epoxynopyl ethyl ether,1,5-dimethyl-2,3-epoxynopyl ethyl ether.(2)Because the isolation of the products was very difficult,so an ester of a main product was isolated through a designed process,and its structure was identified by IR,MS,~1H NMR and~(13)C NMR.It was cis-2,2-dimethyl-3-(β-ethoxypropionyl) cyclobutaneacetate.(3)The results suggested that the first product of this action was 2,3-dihydroxy-nopyl ethyl ether,which could be further cleaved to produce cyclobutaneacetic acid or dehydrated to produce 2,3-epoxide.