8-dimethyl-1-phenylnon-7-en-4-ol (I) has been reinvestigated on a quantitative basis. Contrary to a previous report, the major product is not the trans-podocarpa-8,11,13-triene (V) but the hydrophenalene derivative (VII). Oxidation of the mixture with chromic acid, however, enriches the former component as a ketone. Cyclisation of the corresponding diene (IV) gives a preponderance of trans-podocarpatriene (>50%). A
已经定量研究了4,8-二甲基-1-苯基非-7-烯-4-醇(I)的环化。与先前的报告相反,主要产物不是反式-罗汉松-8,11,13-
三烯(V),而是
对苯二酚衍
生物(VII)。但是,用
铬酸氧化该混合物可富集前一种组分酮。相应的二烯(IV)的环化产生大量反式-十二碳烯(> 50%)。已建议对此环化使用非一致的机理。