Progress in pinacol coupling of aldehydes and ketones using low valent titanium is reviewed in recent years.

由低價鈦絡(luò)合物誘發(fā)的片吶醇偶聯(lián)反應(yīng)一级毛片黄色录像，具有良好的化學(xué)選擇性和立體選擇性精品无码久久久久国产精品无码，近幾年來又引起有機(jī)化學(xué)家們的極大興趣與重視亚洲国模私拍人体GOGO图片。

In aprotic solvents magnesium effects pinacol reductive coupling of aldehydes and ketones.

在非質(zhì)子性溶劑欧美片在线免费观看，鎂對頻納醇與醛和酮的還原耦合反應(yīng)也有一定效果。

Now, a convenient, efficient pinacol coupling of aldehydes mediated by zinc in good yields has been carried out in ammonia water in the presence of a little crown ether. Adding a small amount of crown ether was highly effective to enhance the yields of pinacol from 63% to 84%.

本文報道一種簡便精品日韩看片在线观看网站、有效的水相吶偶合反應(yīng)在线观看免费的黄色电影网站，它是在含有少量冠醚的稀氨水溶液中，使用鋅粉促進(jìn)醛基化合物進(jìn)行水相吶偶合反應(yīng)日韩精品合集第一页免费观看，其中加入少量的冠醚有助于提高反應(yīng)的產(chǎn)率2019黄色超碰在线，吶醇產(chǎn)率由63%提高到84%。

5 The pinacol coupling reaction of aromatic aldehydes and ketones was performed in 8-95% yield with magnesium in 0. 1M aqueous NH4CI.

2.4 以蒙脫土K10和鋅的體系中95精品视频，在超聲波作用下日韩se，研究了醛、酮的還原偶聯(lián)反應(yīng)麻豆国产AV无码精品一区二区，于22～30℃反應(yīng)2～3小時外国一级片网站在线观看，產(chǎn)率23～91％。

A reduction-coupling-etherification reaction between aromatic aldehydes or ketones (1) and alcohols ( 2 ) to yield corresponding diether ( 3 ) of pinacol in the presence of tin and chlorotrimethylsilane.

在三甲基氯硅烷婬片A片AAA毛片啊、四氫呋喃體系中日本熟妇BBWHD，芳香醛、酮和醇在金屬錫的作用下發(fā)生還原-偶聯(lián)-醚化反應(yīng)生成相應(yīng)的頻那醇二醚類化合物日韩国产欧美免午夜网。

In Chapter Ⅱ, the pinacol-coupling reactions of carbonyl compounds promoted by dysprosium were described. The reaction of ketones and aldehydes promoted by Dy/n-BuBr were proceeded in anhydrous THF which gave pinacol in high yield.

第二章研究了金屬鏑促進(jìn)下羰基化合物的還原偶聯(lián)反應(yīng)一本大道香蕉8中文在线视频，醛、酮在無水THF中與Dy/n-BuBr反應(yīng)毛片网站在线播放，可高產(chǎn)率地得到頻哪醇女人的屄无遮挡。

The aluminium powder has been used to reduce titanium tetrachloride to generate the low valent titanium reagent which can induce the reductive coupling of aldehydes and ketones to form the corresponding pinacol s.

以價廉易得的鋁粉還原四氯化鈦制得低價鈦，將其用于醛酮還原偶聯(lián)日韩二区视频，合成了6種片吶醇日本精品专区视频在线，其中對稱片吶醇4種，不對稱片吶醇2種www黄ww淫。

In the presence of SnCl2- C6H5Me3NBr and microwave irradiation, the mixture of tin-indium and propargyl bromide reacted quickly with aldehydes in aqueous media to produce the homopropargyl alcohols exclusively in high yields.

在SnCl2 和C6H5Me3NBr存在及微波照射下免费激情A片电影，錫-銦和炔丙基溴的混合物在水介質(zhì)中與醛快速反應(yīng)，生成高產(chǎn)率的單一的高炔丙醇A级片一区二区。

Promoted by metal dysprosium, aldehydes and ketones could react smoothly with propargyl bromide to afford the corresponding homopropargylic alcohol s in good to excellent yields, and no allenic alcohols were found.

在金屬鏑的促進(jìn)下福利精品在线，醛、酮可與炔丙基溴反應(yīng)国产69AV视频，高選擇性高產(chǎn)率地得到相應(yīng)的高炔丙醇国产污污自拍视频观看，沒有發(fā)現(xiàn)連二烯醇的存在。

Promoted by metal dysprosium, aldehydes and ketones could react smoothly with propargyl bromide to afford the corresponding homopropargylic alcohols in good to excellent yields, and no allenic alcohol s were found.

當(dāng)用苯基炔丙基溴代替炔丙基溴與醛亚洲最大天堂在线观看视频、酮反應(yīng)時国模大胆私拍啪啪AV，主要得到了相應(yīng)的連二烯醇，而沒有發(fā)現(xiàn)高快丙醇的存在性爽交刺激视频在线，由此提出了六元環(huán)過渡態(tài)的反應(yīng)機(jī)理