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The title compound of karounidiol (C30H48O2), a main active triterpene component of snakegourd seed, was isolated from unsaponifiable matter of the seed oil of Trichosanthes kirilowii Maxim., and characterized by X-ray diffraction analysis. It crystallizes in orthorhombic system, space group P212121 with C30H48O2CH3OHH2O (C31H54O4), a = 7.515(1), b = 14.407(1), c = 27.799(2) , V = 3009.8(5) 3, Z = 4, Dx = 1.087 g/cm3, Mr = 490.77, F(000) = 1088 and = 0.086 mm-1. The final R = 0.0840 and wR = 0.2289 for 2752 observed reflections (|F|2 ≥ 2|F|2). The molecular crystal structure of karounidiol shows relative stereochemistry of (3,13,14, 20)-3,29-dihydroxy-13-methyl-26-norolean-7,9(11)-diene. The molecule is composed of five six- membered rings with ring junctures of A/B trans, C/D trans and D/E cis.
The title compound of karounidiol (C30H48O2), a main active triterpene component of snakegourd seed, was isolated from unsaponifiable matter of the seed oil of Trichosanthes kirilowii Maxim., And characterized by X-ray diffraction analysis. It crystallizes in orthorhombic system, space group A = 7.515 (1), b = 14.407 (1), c = 27.799 (2), V = 3009.8 (5) 3, Z = 4, Dx = 1.087 g / cm3, Mr = 490.77 , F (000) = 1088 and = 0.086 mm-1. The final R = 0.0840 and wR = 0.2289 for 2752 observed reflections (| F | 2 ≥ 2 | F | 2). The molecular crystal structure of karounidiol shows relative stereochemistry of (3,13,14,20) -3,29-dihydroxy-13-methyl-26-norolean-7,9 (11) -diene. The molecule is composed of five six- membered rings with ring juncts of A / B trans, C / D trans and D / E cis.