A method for the synthesis of cyclobuta aromatic compounds by cyclizing two ortho dibromoalkyl substituents is described. The invention also provides methods for isolating betulin; lupeol; betulinic acid; 9,10-epoxy-18-hydroxyoctadecanoic acid; 9,10,18-trihydroxyoctadecanoic acid; polyphenolic polymers and fatty acids from birch bark. An intermediate transfer member is adapted such that the toner image is primarily transferred thereto.