13C NMR spectra for a variety of isoflavones are presented and analysed. The novel isoflavone, Millettin (Xa) is shown to be closely related to Auriculatin (II). While comparison of the 13C NMR spectra did not readily prove the orientation of the fused pyran ring, the use of acetylation shifts showed unambiguously that the fusion in linear, rather than angular.
给出并分析了各种异黄酮的13 C NMR光谱。小说中的异黄酮Millettin(Xa)与Auriculatin(II)密切相关。尽管13 C NMR谱图的比较不能轻易证明稠合吡喃环的方向,但是乙酰化位移的使用清楚地表明融合是线性的,而不是角度的。