查询词典 duff

Methods 4-Hydroxy- benzonitrile was treated with sodium hydrogen sulfide and anhydrous magnesium chloride in dimethyl formamide to give thioamide, which was then directly cyclized with ethyl 2-chloroacetoacetate without separation to give ethyl 2-(4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(2) in one-pot; then 2 was formylated with Duff reaction adopting hexamethylenetetramine in trifluoroacetic acid to give ethyl 2-(3-formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(3); finally, the target compound was obtained by the treatment of 3 with hydroxylamine hydrochloride and sodium formate in formic acid.

采用"一勺烩"方法，以4-羟基苯甲腈为起始原料，首先与硫氢化钠和无水氯化镁在N，N-二甲基甲酰胺中反应，所得中间体不经分离，直接加入2-氯乙酰乙酸乙酯进行环合反应，得到2-(4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（2）；然后通过六亚甲基四胺/三氟乙酸进行Duff反应，得到2-(3-甲酰基-4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（3）；再经盐酸羟胺/甲酸/甲酸钠体系脱水得到目标化合物。

Mr. Duff, can you see me?

Mr.Duff，你能看见我吗？

And their onetime feud, which Duff once called "silly," is all in the past.

而她们的不和在Duff的一句"无聊"后成为了过去。

Duff: That's a song that says,'ok, everybody relax and listen.

duff：这就是一首大家放松心情去听的歌。

That system provides only for the Porter/Duff "over" operator.

原来的系统只提供了Porter/Duff的"覆盖"操作。

The main omissions are extended-precision arithmetic; the goto statement; nonstructured forms of switch such as Duff's device; passing struct and union parameters and results by value; and functions with variable numbers of arguments.

而忽略的主要是扩展精度类型的算术运算(long long和long double)； goto 语句；如达夫设备(Duff's device)之类的非结构化switch转移；结构体、联合体参数传递和结果值返回；以及带有变长参数的函数。

Rosie Duff has been raped, stabbed and left for dead in an ancient Pictish cemetery.

Rosie Duff被奸杀了，死在了一间古老的墓地里。

Teen starlet Hilary Duff claims she's never had a problem with her weight, but feels pressure to be thin.

年轻的偶像Hilary Duff声称在她的体重上从没出现过问题，不过在瘦了以后感觉到压力。

Now all cleaned up and studying for a business degree from Seattle University, he's in GN'R supergroup Velvet Revolver, singer of his own rock band Loaded, and even writes a financial column for Playboy.com. So read on if you can't get enough of that wonderful Duff

但现在不但全都戒掉了，还从西雅图大学取得了商业学位，而且在枪与玫瑰以及丝绒左轮，以及他自己的摇滚乐团子弹上膛，甚至还帮Playboy.com写了经济专栏，如果你还不知道Duff有多麼的美好，读吧！！

Keywords 5-nitrosaicy|aldehyde polyphosphoric acid formylation Duff reaction

5-硝基水杨醛；多聚磷酸；甲酰化； Duff反应

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐