河北医科大学药学院2018 Ha 0 Ha h ""Hb "Ph Jb≈0(90 degree) Jab≈4-9(45 degree) 421 1Hbr.d,J=10.6Hz,H-5) (IH,br.d,J=3.0Hz,H-5) 422 天然药物化学教研室史清文教授 1
河北医科大学药学院2018 天然药物化学教研室史清文教授 11 O Ha Ph Hb O O Ha Hb Ph O Jab 0 (90 degree) Jab 4-9 (45 degree) 421 (1H, br. d, J = 10.6 Hz, H-5) (1H, br. d, J = 3.0 Hz, H-5) O CH3 O H H CH3 H H HO HO H H5 O CH3 O H H H3C H H HO HO H H5 422
河北医科大学药学院2018 如何计算偶合常数 The spacing between the lines of a doublet,triplet or quartet is called the coupling constant.It is given the symbol J and is measured in units of Hertz (cyeles per second).The magnitude of the coupling constant can be calculated by multiplying the separation of the lines in units (ppm)by the resonance frequency of the spectrometer in mega Hertz. JHz=ppm x MHz (typically 300,400,or 500 MHz) 42 II* 3 00370n品00102 天然药物化学教研室史清文教授 12
河北医科大学药学院2018 天然药物化学教研室史清文教授 12 The spacing between the lines of a doublet, triplet or quartet is called the coupling constant. It is given the symbol J and is measured in units of Hertz (cycles per second). The magnitude of the coupling constant can be calculated by multiplying the separation of the lines in units (ppm) by the resonance frequency of the spectrometer in mega Hertz. . J Hz = ppm ⅹ MHz (typically 300, 400, or 500 MHz) 如何计算偶合常数 423 O O OH OCH3 H3CO HO 3 2 2' 6' 5' 2 3a 424
河北医科大学药学院2018 OH-3 7加6 山u 5 3 428 天然药物化学教研室史清文教授 13
河北医科大学药学院2018 天然药物化学教研室史清文教授 13 OH-3’ 2 3 6 8 O O OH OH OCH3 H3CO OH 2 3 2' 6' 5' 2' 6' 5' 425 O O OH OH OCH3 H3CO OH 2 3 2 3 2' 6' 5' 2' 6' 5' 426
河北医科大学药学院2018 5,4'-Dihydroxyflavone H-2,6 7 6品 13.0 天然药物化学教研室史清文教授 14
河北医科大学药学院2018 天然药物化学教研室史清文教授 14 3 7 5 4' 1' 8 6 4 2 1 O OH O OH 13.0 12.5 8.0 7.5 7.0 6.5 12.82 s OH-5 7.96 d J=8.7Hz H-2', 6' 7.65 t J=8.3Hz H-7 7.13 d J=8.3Hz H-8 6.97 d J=8.7Hz H-3', 5' 6.90 s H-3 6.79 d J=8.3Hz H-6 5, 4'-Dihydroxyflavone 427 O O OCH3 OH H3CO OH 3 2 428
河北医科大学药学院2018 269阳 2528阳 22709 成儿 g日 wo oCm.. OH OH O 429 W型偶合 当两个氢核正好位于英文字母“w”的两 端时,由于空间上很接近,而可发生远 程偶合,但J值很小,仅约为1Hz,称W型 偶合。 430 天然药物化学教研室史清文教授 15
河北医科大学药学院2018 天然药物化学教研室史清文教授 15 H-2, d 5.33 (dd) J=12.9, 2.9 Hz H-3a, d 3.08 (dd) J=12.9, 17.1 Hz H-3b, d 2.79 (dd) J=2.9, 17.1 Hz O O OCH3 OH H3CO OH 3 2 429 W 型 偶 合 当两个氢核正好位于英文字母“w”的两 端时,由于空间上很接近,而可发生远 程偶合,但J值很小,仅约为1Hz, 称W型 偶合。 430