The So‐called coal tar resins are defined and their preparation from vertical retort tar and pitch is described. The resins are divided into resinols, resinoic acids, resinenes, and resinamines, about 99% consisting of resinenes. The importance of dxygen in these compounds is discussed. Further fractionation of resinencs by precipitation and chromatography and the analyses of the fractions are reported. It appears that the resinols react during the distillation of tar to give higher molccular wegiht resinous compounds.
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Green et al. (1948) studied this question.