The acetalization and ketalization of various aldehydes and ketones with glycols using FeCl3 as catalyst were studied. The effects of reaction time, mole ratio of reactants and amount of catalyst on the yield of acetals were investigated.

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A series of p-toluene sulfonylamido acetacylhydrazone derivatives were synthesized from p-toluenesulfonyl chloride which reacted with glycine to get the intermediate p-toluene sulfonylamido glycine, then through the esterification, hydrazinolysis to afford another intermediate p-toluene sulfonylamido acethydrazide, which condensed with different aldehydes to obtain the target compounds that were characterized by IR, 1H NMR, 13C NMR spectra and elemental analysis.

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A series of methyl 2,7,7-trimethyl-5-oxo-4-aryl1,4,5,6,7,8- hexahydroquinoline -3-carboxylate were synthesized by the reaction of aromatic aldehydes,dimedone and methyl acetoacetate using ammonium acetate as catalyst in glycol under microwave irradiation with 82%～98% yields in 4～6 min.

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Organozinc reagents can react with a variety of α,β-acetylenic ketones and aldehydes in the absence of any catalyst. The one-pot reaction affords β-branched Baylis-Hillman type adducts, the multifunctionalized alkenes, in excellent yields with high stereoselectivity.

這種順式親核加成反應(yīng)的發(fā)生是由于該類有機(jī)鋅試劑既具有較強(qiáng)的親核性永久看免费a级毛片，又具有Lewis酸的特性三级片视频图片小说，使有機(jī)鋅中R基團(tuán)從同位進(jìn)攻中心碳原子而形成新的碳碳鍵。

It opens with a citrus blast which very : quickly morphs to a complex citrus / herbal / aldehydic / wood accord: As comp : lex as the opening accord is, it is so smoothly balanced with rosewood, verben : a, and citrus notes… the whole augmented by a judicious use of aldehydes.

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The study found gaseous aliphatic aldehydes , which are carcinogenic and mutagenic, in incense smoke.

研究證明香煙中的氣態(tài)的〈化〉脂肪族的醛，乙醛国产老师开裆喷水视频，是致癌物和誘導(dǎo)有機(jī)體突變的物質(zhì)欧美性爱αV在线视频。

Aldehydes and other carbonyl compounds are most easily polymerized by essentially anionic mechanisms on account of the stability of alkoxide ions.

醛類和其他的羰基化合物，由于烷氧基離子的穩(wěn)定性丝袜交欧美另类，最容易通過本質(zhì)上是負(fù)離子的機(jī)理進(jìn)行聚合。

The asymmetric allylation of aldehydes is one of the most important methods for preparation of chiral homoallylic alcohol, which is the building block in organic synthesis of fine chemistry and drugs.

手性烯丙基醇是一類重要醫(yī)藥中間體又刺激又黄色网站，合成手性烯丙基醇的常見方法是醛的不對稱烯丙基化反應(yīng)在线毛片免费。

The allylation reactions of aldehydes with allyl bromide were carried out in 76%～93% yields with Nd-SnCl2-H2O under ultrasound irradiation at room temperature for 50～60 min.

在Nd-SnCl2-H2O體系中，用烯丙基溴超聲誘發(fā)下進(jìn)行了一系列芳香醛的烯丙基反應(yīng)久久精品国产高潮AV，室溫反應(yīng)50～60min得76%～93%烯丙基化產(chǎn)物在线黄网站；而不用超聲波時(shí)同樣體系中攪拌3～4h高烯丙基醇產(chǎn)率為30%～86%。

The allylation reactions of aromatic aldehydes or ketones with allyl bromide were carried out in 60%～98% yields with Sn/H2O under ultrasound irradiation at room temperature for 45 min.

超聲波作用下黑人AAAAAAAA片免费，Sn/H2O體系中91精品人妻综合导航，芳香醛酮在室溫下進(jìn)行烯丙基化反應(yīng)，45min內(nèi)得到60%～98%的烯丙基化產(chǎn)物