Extractives from East African timbers. Part II. Ptæroxylon obliquum

Abstract

Extraction of the timber of Ptæroxylon obliquum(Thunb.) Radik. has given the known chromone heteropeucenin methyl ether (I) and also two new chromones, ptæroxylin and alloptæroxylin. A fourth compound, obliquin, has been identified as an æsculetin derivative, and a fifth, umtatin, has been characterised but not further studied. The new compounds have been allocated structures and their phytochemical significance is discussed.