STUDIES ON THE CONSTITUENTS OF ACERACEAE PLANTS .13. DIARYLHEPTANOIDSAND OTHER PHENOLICS FROM ACER NIKOENSE

From a mixture of the bark and twigs of Acer nikoense MAXIM. (Aceracea e), nine compounds (1-9) were newly isolated. Compound 1 was identical with acerogenin E, and compounds 8 and 9 were beta-orcinol derivative s. a Acerogenin K (2), a new diarylheptanoid of the cyclic biphenyl ty pe, yielded acerogenin E on oxidation. Acerogenins F (3) through L (7) are new diarylheptanoids of the cyclic diphenyl ether type, whose ske letons and substituents of the diphenyl ether moieties are the same as those of acerogenin A. Their structures were elucidated on the basis of chemical and spectroscopic evidence.