(4-dimethylamino-benzoyl)-malononitrile | 54615-83-7

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: (4-dimethylamino-benzoyl)-malononitrile
• 英文别名: 2-[4-(Dimethylamino)benzoyl]propanedinitrile
• CAS: 54615-83-7
• 化学式: C₁₂H₁₁N₃O
• 分子量: 213.239
• InChiKey: JDUFPKCVGQSTNV-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.6
• 重原子数：
  16
• 可旋转键数：
  3
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.25
• 拓扑面积：
  67.9
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  4-N,N-dimethylaminobenzoyl cyanide 、 丙二腈 在 三乙胺 、 苯 作用下， 生成 (4-dimethylamino-benzoyl)-malononitrile
  参考文献：
  名称：

  Application of time-variable feedback to the input amplifier of pulse magnetic resonance spectrometers: Experimental studies

  摘要：

  Experimental research on the improvement of the sensitivity and time resolution of pulsed magnetic resonance spectrometers is discussed. It is shown that application of a time-variable feedback of a signal to the input of the receiver amplifier can decouple the "fixed" relationship between the quality factor Q and the ringdown time of the resonance system. Experiments were performed with low-frequency, radio-frequency and microwave pulse-type magnetic resonance receivers. Modifications of an S/C-band electron spin echo modulation spectrometer carried out to check the "time-variable feedback" performance are described. It is demonstrated that the application of a time-variable feedback can significantly reduce the ringdown time and improve the recovery properties of the magnetic resonance receiver system. It is also demonstrated that the time-variable feedback can improve the overall receiver sensitivity due to the fact that the working bandwidth of the resonance system can be optimized separately for the transmitting and the receiving mode. Signal values could be increased at least three times and the signal-to-noise ratio about 1.5-2 times. The largest improvement is achieved with the initially overcoupled resonator. Experimental spectra of test samples for different settings of the time-variable feedback are shown.

  DOI：

  10.1007/bf03166126