苄腈能发生傅克酰化反应吗?文献报道：苄腈与 溴乙酰 溴在 三氯化铝 催化下发生傅克酰化反应 具体操作步骤：The reactor was charged with 2.5 mL of 1,2-dichloroethane, AlCl3 (0.55 g, 4.14 mmol), 2-bromoacetyl bromide (1.21 g g, 6.0 mmol) was added dropwise at 0 ° C, followed by the dropwise addition of benzonitrile (0.52 g, 5.0 mmol) at one time. After the addition was complete, the cooling was stopped and stirring was continued for 4 h, the temperature was raised to room temperature, the deionized water was added to quench the excess of AlCl3, The organic layer was separated and evaporated to dryness, and the crude product was purified by column chromatography to give Compound 1-1 (0.9g, 80 percent). TLC：检测反应显示无新点产生（分别在0℃、20℃、50℃反应检测） 请教：请各位大神帮忙分析一下在该反应中不反应的原因有哪些呢？查看更多3个回答 . 15人已关注
请教光电探测器噪声电流怎么测?本人新入门光电探测器，有一些参数不知道怎么测，想请教下相关领域专业人员 1. 探测器的带宽。在计算散粒噪声的时候，要用到暗电流Id和带宽B（见以下公式），这里的带宽是什么概念？怎么测出来的？ in=sqrt(2*e*Id*B) 我看到有些资料里面写着带宽可以用电阻和电容来计算（见以下公式），难道要 测试 电化学阻抗谱吗？ B=1/(2*pi*R*C) 2. 总的噪声电流要怎么测？我看有的文章说是用暗电流的快速傅里叶变换随时间变化来测试？这个测试原理是什么呢？（参考文章如下） The total noise currents of PPDs with 30 or 70 nm thick C60 layer were measured from the fast Fourier transform of dark current as a function of time under −0.2 V bias, as shown in Figure 3c. 参考文章：Adv. Funct. Mater. 2017, 27, 1703953查看更多2个回答 . 15人已关注
第1天
关注盖德视界
添加小助手
