Another is the Lewis definition (also 1923): An acid is a chemical that can accept an electron pair from a base, which they share to form a covalent bond.

另一種理論是路易斯理論(也是在1923年發(fā)表)：酸就是能由堿接受一個(gè)電子對形成一個(gè)共價(jià)鍵的化學(xué)物質(zhì)一级黄色夫妻生活a片在线免费观看。

We screened a set of Lewis base organocatalysts derived from chiral pipecolinic acid and tert-butanesulfinamide for the reduction of-N-Cbz-1- phenylpropenamine, including newly designed ones and some of those previously developed in our lab. However, only moderate stereoselectivities, albeit high yields were obtained.

在本課題組前期研究的基礎(chǔ)上，我們篩選并設(shè)計(jì)了一系列以手性哌啶酸和叔丁基亞磺酰胺為母體的有機(jī)小分子路易斯堿催化劑中国AAAA片爽快免费，它們能催化三氯氫硅對-N-芐氧羰基-1-苯基丙烯胺的不對稱還原欧美一级黄片在线播放，獲得很高的收率和中等的對映選擇性，并且具有很好的底物普適性欧洲熟妇色XXXX欧美老妇。

Starting from chiral proline, pipecolinic acid, piperazine-2-carboxylic acid and 1,2-diphenyl amino alcohol, a series of structurally simple and easily prepared amides were developed as highly effective Lewis basic organocatalysts for the asymmetric reduction of imines with trichlorosilane as the reducing agent, which promoted the reduction of N-aryl imines with high yields and excellent enantioselectivities with an unprecedented substrate spectrum.

本文分別由手性脯氨酸欧美大片www、哌啶酸、哌嗪酸以及氨基醇出發(fā)欧美三级在线手机版费观看，設(shè)計(jì)和合成了一系列結(jié)構(gòu)新穎日韩av免费a片网站、合成簡便、性能優(yōu)良的酰胺類有機(jī)小分子路易斯堿催化劑www886ys.com，以廉價(jià)的三氯氫硅為氫源欧美熟妇XXXXX色熟妇Y，用這些催化劑催化亞胺不對稱還原，得到了非常優(yōu)良的收率亚洲精品人成中文毛片、對映選擇性和前所未有的底物普適性亚洲中文字幕第二。

The Lewis base property of MgO was studied quantitatively by infrared spectroscopy with boric acid trimethyl ester as the molecular probe.

采用硼酸三甲酯作為探針分子對MgO的路易斯堿性進(jìn)行了紅外光譜定量研究可以直接看的毛片。

The Soft-Hard Acid-Base Theory was used to interpret the experimental results for the first time, the softness of sulfur, which was a Lewis base, was changed by solvents, and the reactivity of sulfur atom was changed.

結(jié)果表明A片吃奶一区二区三区四区，砷化鎵表面硫化層厚度與所用溶液的極性有關(guān)，用極性小的有機(jī)醇作溶劑可以得到更厚的硫鈍化層在线观看v片免费视频小说。

An ate complex is a salt formed by reaction of a Lewis acid with a base whereby the central atom increases its valence.

酸根型配合物是指路易斯酸與特定的鹼生成的中心原子價(jià)升高的鹽日本人人操人人摸富。