CA-CTSs including N,O-carboxymethyl chitosan,N,O-1-carboxyethyl chitosan (N,O-1-CEC),N,O-2-carboxyethyl chltosan(N,O-2-CEC),N-carboxymethyl chitosan and N-1-carboxyethyl chitosan(N-1-CEC) are quaternized using active quaternary salts prepared in laboratory.5 series including 25 kinds amphoteric chitosans characterized with polymeric ampholyte,in which 24 kinds are synthesized firstly,are obtained, 2-Hydroxypropyl dimethylbenzyl ammonium N,O-(1-carboxyethyl) chitosan chloride (GDMBA-N,O-1-CEC) is hydrolyzed into serial low molecular weight GDMBA-N, O-1-CEC with acid as catalyst and microwave as assistant instrumentality innovately.

以合成的活性季銨鹽改性了N，O-羧甲基殼聚糖欧乱色国产精品免费视、N国产精品视频人人做人人，O-1-羧乙基殼聚糖(N，O-1-CEC)欧美肥美性爱视频二区、N2021精品手机在线，O-2-羧乙基殼聚糖(N，O-2-CEC)中文字幕欧洲有码无码、N-羧甲基殼聚糖和N-1-羧乙基殼聚糖(N-1-CEC)等羧烷基殼聚糖日本XXXX厕所偷拍视频，得到5個系列25種具有兩性高分子電解質(zhì)特征的新季銨化羧烷基殼聚糖，其中24種為首次合成白浆AA片；創(chuàng)新提出以微波輔助酸催化的方法催化2-羥丙基二甲基芐基-N人人网人人摸人人操，O-(1-羧乙基)殼聚糖氯化銨(GDMBA-N，O-1-CEC)水解日韩第一视频，得到了低分子量的GDMBA-N圄产精品久久久久精品，O-1-CEC。

Cytochrome P450 BM-3 (CYP102) from Bacillus megaterium catalyzes the subterminal hydroxylation of long-chain fatty acids (C12 to C20) at the positions ω-1,ω-2,ω-3 and the epoxidation of unsaturated fatty acids. Artificial mutants of P450 BM-3 also hydroxylate substrates like short-chain fatty acids (C8 to C10), alkanes, cycloalkanes, heteroarenes and polycyclic aromatic hydrocarbons, which offers potential applications in the pharmaceutical industry, environmental measurement and bioremediation and chemical industry.

細(xì)胞色素P450BM-3來源于Bacillus megaterium色爱综合区国产精品，能催化長鏈脂肪酸C_(12-C_(20)的次末端(ω-1日韩精品黄色免费在线观看，ω-2，ω-3)羥化及不飽和脂肪酸的環(huán)氧化黄色视频在线观看链接，其突變體催化的底物拓展到中鏈的脂肪酸C_8-C_(10黄色视频中文字幕、烷烴、環(huán)烷烴欧美黑白激情性爱、雜環(huán)烴欧美日一级大片、多環(huán)芳烴等，因此在醫(yī)藥工業(yè)www.99riav113.com、環(huán)境檢測和修復(fù)及化學(xué)工業(yè)具有廣闊的前景在线看成年人视频。

This thesis mainly focused on the sidearm effects in catalytic Wittig-type olefination and catalytic asymmetric 1, 3-dipolar cycloaddition between nitrones and alkylidene malonates.

本文主要研究了催化的葉立德烯基化反應(yīng)及催化的不對稱1，3偶極加成反應(yīng)中的邊臂效應(yīng)抠逼黄片15.0。在論文的第一部分免费在线综合精品观看，我們設(shè)計、合成了聚乙二醇負(fù)載的烷基碲化合物33(Bu-Te-PEG-Te-Bu)9reav。

HCo 〓-catalyzed hydroformylation and isomerization of allene and propyne Allene hydroformylation favors the linear anti-Markovnikov product in high regioselectivity both kinetically and thermodynamically. The origin of this regioselectivity comes from the enhanced stability of the η〓-allylic intermediate (η〓-CH〓CHCH〓 Co 〓.

HCo〓催化的丙二烯和丙炔氫甲跹侵轪v人妻不卡；磻?yīng)及異構(gòu)化反應(yīng) HCo〓催化丙二烯氫甲酰化反應(yīng)的區(qū)域選擇性主要由不可逆的丙二烯插入步驟決定，動力學(xué)和熱力學(xué)因素都有利于形成anti-Markovnikov中間物種(η〓-CH〓CHCH〓)Co〓色哟哟com，形成Markovnikov中間物種Co〓是不具有競爭性的日韩精品影视系列在线播放视频。

This thesis mainly studied on sulfamic acid catalyzed Cross-Aldol condensation, direct amidation of benzhydryl alcohol; solid base catalyzed synthesis of bisindoles was also discussed.

本論文主要討論了磺氨酸催化下的Cross-Aldol反應(yīng)；二苯甲醇的胺化反應(yīng)國產黃片；固體堿氟磷灰石催化的雙吲哚甲烷衍生物的合成www.黄色网站.com。

Synthesis and liquid crystalline behavior of three recently reported mesogenic block-molecules,namely polyhydroxy 1-benzoylaminopropane-2,3-diols Ⅰ,star-shaped pentaerythritol tetrabenzoates Ⅱ and calamitic bolaamphiphiles with lateral chains Ⅲ which are constituted of anisometric block,amphiphilic block and alkyl or perfluorinated chains with different topologies are reviewed in this article.

這些分子由各向異性嵌段、兩親性嵌段和烷基鏈以不同的拓?fù)湫问浇M合而成亚洲精品国产精品永久福利，其合成的關(guān)鍵步驟是Pd(0)催化下碘代全氟烷烴對雙鍵的自由基加成反應(yīng)以及Pd(0)催化的偶合反應(yīng)国产黄色片欧美黄色片。

The reactivities of the phenyl boronic acids containing di-, tri-fluoro substituents with pyridyl bromide were investigated in different catalyst system.

利用鈀催化的SUZUKI偶聯(lián)反應(yīng)，以氟取代的苯硼酸與2-溴吡啶為原料合成了系列新的鄰吡啶芳香化合物欧美性XXXXX极品视频，研究了二及三氟取代的苯硼酸與溴代吡啶在不同催化體系中的反應(yīng)性質(zhì)疯狂伦交成人网站视频在线观看。

For certain reactions, they function as chemoenzymes and produce both good chemical and optical yields. Over the last decade a wide range of C〓-symmetric chiral bisoxazoline ligands have been synthesized from readily available diacid derivatives and amino alcohols.

但是，手性雙噁唑啉催化的某些不對稱反應(yīng)的機(jī)理以及影響雙噁唑啉分子催化性能的結(jié)構(gòu)要素目前仍不是很清楚国产免费丝袜激情视频，誘導(dǎo)某些反應(yīng)的不對稱選擇性仍有待于進(jìn)一步提高官方免费av网站，因此需設(shè)計和合成新的雙噁唑啉類配體。

Using 10 as the catalyst, six prochiral ketone s were reduced enantioselectively with borane and the results were compared with those with 1,1- diphenylprolinol as catalys.

用10催化6種前手性酮的不對稱硼烷還原反應(yīng)粉嫩欧美美人妻小泬视频，其結(jié)果與-二苯基脯氨醇催化的同一反應(yīng)的結(jié)果進(jìn)行了對比国产精a成品人v在线播放。

In the process of reaction of the catalyst, the metal contained in it is introduced in a molecular state into the substance catalyzed (nitro-cellulose).

這種新催化劑是將起催化作用的金屬以分子狀態(tài)引進(jìn)到被催化的物質(zhì)之中——硝棉鉛，它是金屬高聚物的一種欧美在线伊人。