24 リンデレンとその関連化合物のNMRスペクトル

抄録

Recently, Takeda and coworkers have elucidated the structures of linderene (I), which is a sesquiterpenic component of the root of Lindera strychnifolia Vill., and its dihydrogenated products, dihydrolinderene (II) and isodihydrolinderene (III). Here are presented the proton magnetic double and (or) triple resonance studies of I, II, and III in deuteriochloroform and pyridine-d_5 at 100 mc field to make the full interpretation of the spectra of these compounds. The proton spin-decoupling experiments were performed by using a Varian HA-100 spectrometer with two Hewlett-Packard HP-200ABR audio-oscillators and on HP-5212A electronic counter in the frequency sweep and TMS locked mode. As a result, the spectra of I, II, and III were revealed to correspond well to their chemical structures. Particularly, the proton spin-decoupling experiments on II evidently showed the β-configuration of the cyclopropane ring. Several long-range spin couplings in the molecules examined were found also. Incidentally, the spectrum of isolinderoxide (IV), another minor sesquiterpenic component isolated from the same plant, in which the β-configuration of the cyclopropane ring was determined by the degradation, was also studied to show that its structure is correct.