By analyzing the structure of Gen, refering to the strcture of NO-NSAIDs which has the function to release NO slowly, we got a target compound by esterification and nitration reaction. The structure of this new compound was confirmed by nuclear magnetic resonance, infrared spectrum and mass spectrometry.

研究方法 1。 NO-G的結(jié)構(gòu)設(shè)計、合成及鑒定分析Gen的結(jié)構(gòu)，參照NO-NSAIDs的結(jié)構(gòu)設(shè)計，采用化學(xué)合成的方法經(jīng)酯化反應(yīng)和硝基化反應(yīng)得到目標化合物AAAAAAA级特黄性爱视频，通過核磁，紅外和質(zhì)譜分析對得到的化合物進行結(jié)構(gòu)確證欧美多人囗交A片。

Although scientists have not previously identified the precise connection between oxidation and neurodegenerative diseases, researchers from the US department of energy's Pacific Northwest National Laboratory and UCLA's David Geffen school of medicine have found that damage is due to a byproduct of oxidisation called nitration.

盡管科學(xué)家們之前并未確定氧化和神經(jīng)退化疾病的精確聯(lián)系欧美综合亚洲，美國能源部太平洋西北國家實驗室和加州大學(xué)洛杉機分校David Geffen醫(yī)學(xué)院的研究人員們已經(jīng)發(fā)現(xiàn)細胞破壞源于一種氧化作用的副產(chǎn)品硝基置換。

At 80℃, the yield of esterification of benzoic acid with ethanol could reach 95% by using 10% catalyst for 6 h; the conversion of toluene in the nitration with 1 equiv. of 65% nitric acid could be achieved to 99% by using 5% catalyst for 5 h.

在80℃下欧美在线一级片，摩爾分數(shù)為10%的Yb(NTf2)3負載催化劑可以直接观看的黄片，反應(yīng)6h可使苯甲酸乙酯的產(chǎn)率達95%；摩爾分數(shù)為5%的Yb(NTf2)3負載催化劑天堂国产av片，反應(yīng)5h可使甲苯與等摩爾質(zhì)量分數(shù)為65%硝酸的硝化反應(yīng)轉(zhuǎn)化率達99%8x永久在线视频。

The result indicates that the big π bond of benzene not only turns benzene into a Lewis base,but also makes it to undergo electrophilic substitution (halogenation,nitration,sulfonation and so on),rather than addition

結(jié)果表明，苯的環(huán)狀大π鍵結(jié)構(gòu)不僅使苯成為1個Lewis堿自拍日韩动漫欧美激情视频网站大全，而且使苯容易發(fā)生鹵代欧美熟妇性生活、硝化、磺化等親電取代反應(yīng)黄色www，但不易發(fā)生加成反應(yīng)日韩一区二区黄色视频。