查询词典 acetyl bromide

When bromine was used to bromization reaction with 4-acetyl-guaiacol,the product bromide incompletely or super bromide partial,and the selectivity was poor.

使用单质溴与4-乙酰基愈创木酚进行溴化反应时，产物溴化不完全，或者局部过量的溴化，且选择性较差。

In China, We are also the biggest manufacture of Acetyl bromide , Propionyl bromide, Bromoacetyl bromide, 2-bromopropionyl bromide,-1,4-dibromobut-2-ene and Phosphorus tribromide etc.

拥有一支以海归博士、硕士为主的研发队伍和专业外贸营销人才。公司首批通过ISO14001国际环境管理体系认证，并通过IS09001质量管理体系认证。

It is found that when the molar ratio of sulphoxide,pyridine and acetyl bromide is 1∶0.6∶0.4,the catalytic effect on the ring-enlargment is the best,and the yield and purity of the final product can reach 76% and 97% respectively at a pH of 1.8 in toluene under refluxing for about 3.5h.

通过正交实验可得出以下结论：当N，N′-双脲-亚砜为2.5∶1，乙酰溴-亚砜为0.4∶1，吡啶-乙酰溴为1.5∶1，回流时间为3.5h，酸化pH值为1.8时，扩环反应结果最好，总收率可达76%，纯度97%以上。

For example, pulverized wood samples can be treated with acetyl bromide in acetic acid, and the absorbance of the resulting solution at 280 nm can be compared with the absorbance obtained from known lignin standards.

例如，将木屑样品在乙酸环境下与乙酰溴进行反应，再将280纳摩尔所得溶液的吸收率与已知的木质素标准吸收率进行比较。

Penicillin G sulphoxide is esterified by N,N′-bistrimethylsilyl urea under the temperature 55℃ with a molar ratio 2.5∶1 between BSU and sulphoxide,and the ester obtained is ring-enlarged in the toluene under refluxing with the exist of catalyst-pyridine acetyl bromide.

摘 要 本文在制得青霉素G亚砜的基础上，完成了重排酸的扩环反应，重点探讨了扩环反应的最优化条件。青霉素G亚砜与N，N′-双脲在55℃下反应，得到亚砜的酯化物。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。