sabinene limonene and dipentene as well as mixtures thereof in addition to acidic ion exchange resins a number of acid catalysts may be used both bronsted and lewis including boron trifluoride etherate aluminum trichloride and phosphoric acid moreover reaction temperatures may vary resulting in no substantial effect on product formation methods for isolating i and ii from the above described crude mixtures are not known the instant invention therefore provides for a novel purification isolation process as a result of the process i may be isolated from ii whereby both i and ii are at least about 95 pure the method of isolating i from ii and particularly iii from iv entails heating the above described crude mixture to a temperature of about 50 u00b0 60 u00b0 c followed by the addition of solvents such as chloroform in an amount equal to about one half the volume of the crude mixture subsequently the above obtained crude mixture chloroform solution is stirred and cooled to about room temperature producing a thick oily mixture in which a tan crystalline solid deposits therefrom the crystalline solid is recovered therefrom by filtration and a bpt 2 containing flitrate is obtained via h 1 and 13 c nmr analysis as well as physical property analysis i e melting.