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The title compound 6?-chloro-4?-methylene-3 H-spiro [isoben zofura-1,3?-isochroman], C_(17)H_(13)ClO_2, was prepared and characterized by IR, NMR, HRMS and single-crystal X-ray diffraction. This compound has a bisbenzannulated [5,5]-spiroketals skeleton. It crystallizes in orthorhombic, space group P212121 with a = 13.383(3), b = 7.6120(17), c = 13.793(3) ?, Z = 4, Dc= 1.275 g/cm~3, μ = 0.28 mm~(–1), F(000) = 592, wR = 0.1443 and R = 0.0557. The preliminary biological test showed that the title compound has good anti-bacterial activities in vitro. 相似文献
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利用直观推断法(heuristc)讨论了离散效应在高斯光束第Ⅱ类相位匹配(PM)二次谐波振荡(SHG)过程中的影响,导出了适用于任意离散参量B和聚焦参量ξ的高斯光束第Ⅱ类PMSHG转换效率的孔径积分公式. 相似文献
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