Vaalens sesquiterpenes of Catha transvaalensis; structure of vaalens-5 using the COLOC n.m.r. pulse sequence
Abstract
Catha transvaalensis(Celastraceae), a rare relative of Catha edulis which is the source of the psychotomimetic drug khat, contains at least six related extractives. The major member of the group, vaalens-5, is shown with the help of the n.m.r. pulse sequence COLOC to be the 1,6diacetyl-9-(E)-cinnamoyl-1,4,6,9,15-pentahydroxydihydroagarofuran (1).