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Publications (2)2.02 Total impact

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    ABSTRACT: The title compound maleopimaric acid was synthesized by a Diels-Alder reaction between maleic anhydride and Pinus elliottii engelm oleoresin at room temperature and it was characterized by single crystal X-ray diffraction. The white crystals crystallized in the orthorhombic system, space group P2(12121) with cell dimensions: a = 7.6960 (15) A, b = 11.851 (2) A, c = 24.577 (5) A, alpha = 90 degrees, beta = 90 degrees, gamma = 90 degrees, V = 2241.6(8) A(3), and R(1) = 0.0716, wR(2) = 0.1975. The two fused and unbridged cyclohexane rings form a trans ring junction with chair conformation with two methyl groups in axis positions, the anhydride ring is planar. Crystal water existed in the molecular and stabilized the structure through intermolecular hydrogen bonds.
    Natural product research 08/2008; 22(10):854-9. · 1.01 Impact Factor
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    ABSTRACT: Three kinds of O,O-diethyl N-dehydroabietic aminoarylmethylphosphonates were synthesized from natural product derivatives by two steps of solvent-free reactions through imines intermediates and their structures were characterized by IR, (1)H NMR and (31)P NMR spectroscopy. The solvent-free reactions afforded good yields of N-dehydroabietic imines and alpha-aminophosphonates although the strong space block of dehydroabietylamine to amino group. The green approaches resulted negligible waste and the reactions were environment friendly without using noxious solvents.
    Natural product research 08/2008; 22(10):890-5. · 1.01 Impact Factor