title: Diterpenoids from Acacia leucophloea: revision of the structures of leucophleol and leucophleoxol.
abstract: The pimarane-type structures previously suggested for leucophleol (1) and leucophleoxol (2), two diterpenoids isolated from Acacia leucophloea, must be amended to the isopimarane-type derivatives 5 and 6, respectively. These corrections were supported on NMR spectroscopic studies and, in the case of 6, by an X-ray diffraction analysis. Moreover, the unpublished complete and unambiguous (1)H and (13)C NMR assignments of 5 and 6 together with those of leucoxol (3), another diterpenoid from the same plant, are also reported.
authors.affiliation: Departamento de Cristalografía, Instituto de Química Física "Rocasolano", Consejo Superior de Investigaciones Científicas (CSIC), Serrano 119, E-28006 Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: del Carmen Apreda Rojas
authors.forename: F H
authors.initials: FH
authors.lastname: Cano
authors.forename: B
authors.initials: B
authors.lastname: Rodríguez
mesh_terms: D000045:Acacia / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D004224:Diterpenes; C435258:leucophleol; C435259:leucophleoxol; C435260:leucoxol