Question

急！化工英语翻译，追加至100分，不要翻译器，力求通顺。

1.1. General procedure for the selective oxidation of suldes to sulfoxides
To a mixture of various suldes (1 mmol) and DBUH-Br3 (0.1 mmol, 0.039 g) in CH3CN (15 mL), H2O2 30% (v/v)(1.4 mmol) was added gradually. After the completion of the reaction which was monitored by TLC using n-hexane:EtOAc (7:3), the solvent was removed and CH2Cl2 was added and the mixture was washed with water, 5% HCl solution and water , respectively. The organic phase was then dried over anhydrousNa2SO4 and the solvent was removed under reduced pressure. The resulting products were determined by their 1HNMR spectrums and compared with the authentic samples.
The synthesis and X-ray structure of DBUH-Br3 as the catalyst have already been reported elsewhere (Fig. 1).In order to get an insight into the optimum catalytic conditions for the selective oxidation of suldes to sulfoxides,the oxidation reaction of methylphenylsulde by hydrogen peroxide as a model experiment was studied at different temperatures and catalyst/H2O2 ratios. The results are summarized in Table 1. Different solvents were also screened.
for the oxidation of methylphenylsulde, and as the result acetonitrile was found to be the best solvent in terms of activity and selectivity.
In order to show the catalytic role of DBUH-Br3, the reaction of methylphenylsulde was performed in the absence of DBUH-Br3. The reaction was not completed within 24 h . Consequently, it was performed in different molar ratios of the catalyst in the presence of oxidant in order to obtain the optimum reaction conditions .The chemoselectivity of the system was also investigated. Several suldes containing an unsaturated C–C bond,nitrile or an alcoholic group were subjected to the sulfoxidation reaction, and it was observed that the functional groups remained intact during the reaction .
The suggested mechanism of this selective oxidation is shown in Scheme 2. DBUH-Br3 might in situ generate Br2.Subsequently, Br+ can be produced via oxidation with H2O2. The nal step of oxidation involves nucleophilic attack of sulfur of the sulde compound on the Br+ followed by concerted oxygen transfer from water to give the corresponding sulfoxide.
In summary, we have described an efcient method for the selective oxidation of suldes to sulfoxides under very mild reaction conditions. Also, chemoselectivity, easy and clean work-up, green oxidant, high yields and the easy preparation of the catalyst were the remarks of this method which could be the priority of the other existing methodologies.

Answer 1

1.1。 一般程序的选择性氧化,sulfoxides suldes
一个融合多种suldes)和DBUH-Br3(1中毒(0.1中毒在CH3CN 0.039 g),(15毫升),过氧化氢(v / v)30%(1.4中毒)是逐渐增添了。完成后的反应进行了监测的薄层色谱(7:3使用调查表:强弱),溶剂转移,以增加了,其混合物是用水洗,5%的盐酸溶液和水,分别。有机相是在anhydrousNa2SO4又干涸下与溶剂移除减压。产生的产品进行了测定和分析,并与他们1HNMR谱正宗的样品。
x射线结构的合成及DBUH-Br3作为催化剂在其他地方已经被报道(图1)。为了深入了解最佳催化条件对sulfoxides suldes选择氧化,氧化反应的methylphenylsulde用过氧化氢作为一种模型试验的方法研究了在不同温度和催化剂/ H2O2比率。结果,总结了表1。不同溶剂也被挑选的。
氧化methylphenylsulde,作为结果乙腈被发现的最佳溶剂方面的活性和选择性。
为了表示DBUH-Br3催化作用的反应是,methylphenylsulde进行DBUH-Br3缺席的情况下。 反应未能完成24小时内。因此,它被用于不同摩尔配比的催化剂在他面前氧化剂为了获得了最佳反应条件,chemoselectivity网络系统的初步研究。几个suldes债券,含有不饱和12组或一名酒鬼腈产品在受到sulfoxidation反应,观察发现官能团在反应过程中,保存完好。
建议的选择性氧化的机理,并给出所显示的是方案2。DBUH-Br3原位生成Br2可能。 随后,通过油菜素内酯+可以产生与过氧化氢氧化。Th