Thirty-one new chiral phosphorus compounds have been synthesized starting from D-camphor,-alpha-phenylethylamine,-Betti base,-1-(4-nitrophenyl)-2-amino- propane-1,3-diol, L-amino acids (such as serine, phenylalanine, proline etc.) and their application as organocatalysts in asymmetric trimethylsilylcyanation of aldehydes and asymmetric borane reduction of prochiral ketones and ketimines were investigated.

該項(xiàng)目從D-樟腦欧美巨大XXXX做受高清、-alpha-苯乙胺、-Betti堿、-氯酶胺、L-氨基酸（如絲氨酸秋葵视频卓版安装、苯丙氨酸、脯氨酸等）出發(fā)合成了31個(gè)新的手性磷化合物亚洲国产AⅤ精品一区二区高清，研究了它們作為有機(jī)催化劑在醛的不對稱硅氰化反應(yīng)欧美大胆人伦姧裸体A片欧、潛手性酮的不對稱硼烷還原反應(yīng)以及亞胺的不對稱硼烷還原反應(yīng)中的催化效果。

The olefmation of benzyl zinc bromides with aromatic aldehydes, which has some theoretical means and good application expectation, has good stereoselectivity and regioselectivity.

烯基化反應(yīng)具有較好的立體選擇性和區(qū)域選擇性久久综合色天天久久18，具有一定的理論意義和較好的應(yīng)用前景樱花aⅴ一区二区三区四区。

Totally, 147 flavor compounds, which comprised of 17 acids, 12 alcohols, 16 aldehydes, 36 esters, 12 furans, 13 ketones, 14 miscellaneous compounds, 8 phenols, 6 pyrans, 4 pyrazines, 3 pyrroles, 6 sulfur-containing compounds, were identified.

共鑒定出147種風(fēng)味化合物，其中酸類17種激情图片!激情小说、醇類12種、醛類16種国产一级无码毛片、酯類36種最新91视屏在线免费、呋喃12種、酮類13種亚洲精品自拍视频网、雜環(huán)化合物14種全国最大的黄色网站、酚類8種、吡喃6種一级毛片免费看高清视频在线、吡嗪類4種日日夜夜,黄色视频、吡咯3種、含硫化合物6種插操水视频。

Chaper 4: Aldehydes, ketones and imines were readily reduced by sodium borohydride with the participation of a small amount of water in good to excellent yields using PEG400 as catalyst at the absence of organic solvents.

第四章：在無溶劑條件和PEG400 催化下狼友视频-首页，在少量水的參與下用硼氫化鈉較容易的還原醛、酮www.xx日本黄色视频.com、和亞胺国产淑女色视频，獲得較高的收率，具有應(yīng)用于大規(guī)模生產(chǎn)的開發(fā)前景操逼视频大全网站。

As open-chain hydroxy aldehydes and hydroxyl ketenes, the monosaccharides are very reactive.

以開鏈的羥基醛和羥基酮形式存在的單糖非衬芸碼v网站；顫娗嗖菔悠得夥芽础?/p>

The reaction of sulfate with aldehydes and ketones has been known for many years.

大家知道硫酸鹽能與醛類和酮類反應(yīng)已有許多年了。

These reactions are therefore used to discern between ketones and aldehydes.

這些化學(xué)反應(yīng)因此被用來區(qū)分醛類和酮類激情一级。

A wide range of carbon-based molecules, such as aldehydes , ketones , and other light hydrocarbons are VOCs.

范圍廣泛的以碳為基礎(chǔ)的分子日本玖玖玖在线视频，如醛，酮色妞网黄污，輕質(zhì)烴都是揮發(fā)性有機(jī)化合物4455免费看大片。

Ketones can participate in many chemical reactions, though to a lesser extent than the related aldehydes.

酮可以參與許多化學(xué)反應(yīng)，雖然它的活性低于與它相關(guān)的醛91视频精彩。

This provides a convenient method for the selective oxidation of alcohols to aldehydes and ketones.

帶給電子取代基和吡啶取代基的底物能順利被氧化人人操人人污。