Tetranortriterpenoids and related compounds. Part 26. Tecleanin, a possible precursor of limonin, and other new tetranortriterpenoids from Teclea grandifolia Engl. (Rutaceae)

Tecleanin and 7-deacetylproceranone, two new tetranortriterpenoids from Teclea grandifolia Engl. (Rutaceae), have been assigned structures (2) and (4) respectively. Tecleanin has the same highly oxidised ring A as limonin but a carbocyclic ring D. A third new limonoid was identified as 7-deacetylazadirone (13).