Dipinene, C20H32, resulting from the action of acids on alpha-or beta-pinene has been studied by various investigators since its discovery a century ago by De~ ille,~ who obtained the substance from turpentine oil and sulfuric acid. 4 The delayed revival of active interest in the diterpene group is probably due in part to the fact that the diterpenes are comparatively few and their acids quite common, while the converse is true of the sesquiterpenes. ...
