The broad-band decoupled and DEPT 13C NMR spectra (Table 1 ) displayed 30 carbons signals as eight methyls, ten methylenes, six methines including one oxymethine, and six quaternary carbons including one hydroxy bearing carbon. It showed shielded C-12 ( dC
23.4) and deshielded C-13 and C-27 ( dC 49.5 and dC 16.3, respectively), characteristic of a hopane/isohopane type triterpene (Mahato and Kundu, 1994). H-3 (dH 3.18) exhibited long-range HMBC correlations with C-4 (dC 38.9), C-23 (dC 28.0) and C-24 (dC
15.4); H3-23 (dH 0.95) showed HMBC correlations with C-24 (dC 15.4), C-4 (dC 38.9), C-3 (dC 79.0) and C-5 (dC 55.0), while H3-24 (dH 0.74) showed correlations with C-23 (dC 28.0), C-4 (dC 38.9), C-3 (dC79.0) and C-5 (dC 55.0), supporting OH at C-3.
The broad-band decoupled and DEPT 13C NMR spectra (Table 1 ) displayed 30 carbons signals as eight methyls, ten methylenes, six methines including one oxymethine, and six quaternary carbons including one hydroxy bearing carbon. It showed shielded C-12 ( dC23.4) and deshielded C-13 and C-27 ( dC 49.5 and dC 16.3, respectively), characteristic of a hopane/isohopane type triterpene (Mahato and Kundu, 1994). H-3 (dH 3.18) exhibited long-range HMBC correlations with C-4 (dC 38.9), C-23 (dC 28.0) and C-24 (dC15.4); H3-23 (dH 0.95) showed HMBC correlations with C-24 (dC 15.4), C-4 (dC 38.9), C-3 (dC 79.0) and C-5 (dC 55.0), while H3-24 (dH 0.74) showed correlations with C-23 (dC 28.0), C-4 (dC 38.9), C-3 (dC79.0) and C-5 (dC 55.0), supporting OH at C-3.
การแปล กรุณารอสักครู่..