Eleven novel 2-alkylthio-5-(5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidine-5-yl)-1,3,4-oxadiazole derivatives (5) and six novel 2-alkylthio-5-(5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidine-5-yl)-1,3,4-thia- diazole derivatives (8) have been designed and synthesized by using 5-amino-3-ethoxycarbonyl-1H-1,2,4-triazole as a starting material.

以5-氨基－1H-1，2欧美老年黄片，4-三唑－3-羧酸乙酯為起始原料jizz免费在线国产，設(shè)計(jì)合成了11個(gè)新型的2-取代硫醚－5-（5，7-二甲基－1免费观看黄视频网站，2，4-三唑并[1午夜福利试看120秒体验区，5-a]嘧啶基）-1，3，4-惡二唑類化合物(5)和6個(gè)新型的2-取代硫醚－5-（5，7-二甲基－1，2欧美日韩二区视频，4-三唑并[1，5-a]嘧啶基）-1，3日韩高清在线一区二区三区，4-噻二唑類化合物(8)九九视频精品在线。

Project Background and Conditions: The company started research new chemical products in 1998. After two years of efforts, a series of pharmaceutical intermediate sulfathiazole leave instructions, including : 3- methyl sulfathiazole leave instructions, 2- sulfathiazole leave instructions ethanoic acid, 2- acetyl sulfathiazole leave instructions, 2-thiofuran amino ethane ,2-thiofuran acetic, 3,4,5- tighter nitrobenzene have been successfully developed. 2-thiofuran amino ethane are the precursors raw materials of series antibiotic analgesic.

二潮吹国产、項(xiàng)目建設(shè)背景及條件：1998年公司開始研究開發(fā)高新精細(xì)化工產(chǎn)品，經(jīng)過兩年的努力看黄色91Av，已成功研制出噻吩系列醫(yī)藥中間體美国特黄视频，包括：3-甲基噻吩、2-噻吩乙酸想看日韩网站、2-乙酰噻吩亚洲精品456在线播放第1集、2-噻吩乙胺538在线视频免费观看国产、2-噻吩乙醇、3日韩黄色AV网，4久久久久国产精品熟女，5-三氯硝基苯等。2-噻吩乙胺系列噻吩產(chǎn)品使用于血小板及血栓有關(guān)的心臟血管病及消炎鎮(zhèn)痛等如氯吡格雷网红干人人干人人操、興孢噻吩鈉、興孢西丁、噻吩洛酸等十幾種新藥的前體原料，是國家政策鼓勵(lì)發(fā)展和有自主知識(shí)產(chǎn)權(quán)的項(xiàng)目亚洲欧洲日韩在线免费视频。

The anion UV cured water soluble prepolymer was synthesized with toluene diisocyanate, dihydroxy compound, dihydroxyalkyl carboxylic acid, and polyurethane acrylate. The structure of the prepolymer was characterized by infrared spectroscopy.

采用甲苯二異氰酸酯先锋av资源网站、聚酯二元醇www.人人干人人艹人人摸、二羥甲基丙酸和丙烯酸羥乙酯合成水性陰離子型聚氨酯丙烯酸酯，用傅立葉紅外光譜證實(shí)了該聚合物的結(jié)構(gòu)。

Two synthetic routes starting from 1,3-dihydroxyacetone and formamidine acetate as well as imidazole-4,5-dicarboxylic acid as starting material were investigated, and the reductive reaction of ethyl imidazole-4-carboxylate was also investigated.

本文對(duì)以1日本香蕉视频在线观看，3-二羥基丙酮和醋酸甲脒為原料和以4，5-二羧酸咪唑?yàn)樵虾铣?(5)-羥甲基咪唑的兩條工藝進(jìn)行了研究并優(yōu)化日韩三级片欧美A片，同時(shí)對(duì)4(5)-羧酸咪唑乙酯的還原反應(yīng)進(jìn)行了探索性實(shí)驗(yàn)。

Dihydroxyacetone; formamidine acetate; imidazole-4,5-dicarboxylic acid; optimizing process; ethyl imidazole-4-carboxylate; reductive reaction; 4(5)-hydroxymethylimidazole

關(guān)鍵字或關(guān)鍵詞組： 1，3-二羥基丙酮污污网址免费观看；醋酸甲脒黃色A级毛片永久免费；4，5-二羧酸咪唑欧美黄色一级A片视频；工藝優(yōu)化2021年国产精品久久；4(5)-羧酸咪唑乙酯；還原反應(yīng)三级中文字幕无码视频；4(5)-羥甲基咪唑

In the presence of catalytic rhodium acetate, ethyl 2-diazo-3-oxo-per fluoroalkanoates, reacted readily with nitriles to give a series of 5-fluoroalkyl substituted 1, 3oxazoles with high regio-selectivity through a metal carbenoid intermediate. The reactions of carbenoids with noncyclic vinyl ethers or cyclic vinyl ethers afforded dihydrofuroates in good to excellent yields. Interestingly, only vinyl C-H insertion compound was obtained concerning of the reaction of carbenoids with 2, 5dimethylfuran due to the steric hindrance of methyl group

醋酸銠分解2-重氮-3-氧代-全氟羧酸乙酯形成的金屬卡賓作為1黄色免费啪啪小电影网站，3-偶極體，可以與一系列芳基或烷基取代的腈反應(yīng)视色,视色,视色影院视色影库，高度區(qū)域選擇性地生成一系列4-乙氧羰基-5-氟烷基取代的噁唑化合物吉泽明步绝顶高潮喷水3小时；也可以與富電子的鏈狀和環(huán)狀的烯基醚反應(yīng)，以優(yōu)良的產(chǎn)率得到一系列氟烷基取代的二氫呋喃類化合物7色在色在线视频；而與2国产色色激情，5-二甲基呋喃的反應(yīng)，由于甲基的位阻作用欧美成免费黄色视频，只得到金屬卡賓對(duì)呋喃3-位烯基碳?xì)滏I插入產(chǎn)物91视频一级片。

The resin which was synthesized by the materials of hydroxy silicone oil , 1, 6-hexamethylene diisocyanate, tolylene diisocyanate, pentaerythritol triarylate and 2-hydroxy ethyl acrylate is able to cure rapidly at room temperature by UV.

本實(shí)驗(yàn)采用溶液聚合的方法，以端羥基硅油中文字幕小说专区亚洲图片、甲苯二異氰酸酯啪啪啪福利视频、六亞甲基二異氰酸酯、丙烯酸—2—羥基乙酯和季戊四醇三丙烯酸酯為原料制備出了新型能夠進(jìn)行快速固化2021色色色、高效的三官能度封端的光固化反應(yīng)體系久久精品国产字幕AV。

A new type of polyaspartic esters secondary amine called PAE-b was prepared from prime amine 4,4'-methylenebis and dialkyl maleates via a Michael Addition Reaction.

通過伯胺4，4'-二氨基環(huán)己基甲烷與馬來酸二乙酯的Michael加成反應(yīng)美国黄色视频黄色视频聊天，合成1種新型聚天門冬氨酸酯仲胺6080新觉伦午夜理论无码。

In this research, liposoluble chlorogenic laurate was synthesized by the acylation with lauroy chloride in the existence of alkali catalyst in non-water phase, and yellowish CGL powders with a yield of 81.24% were obtained under the optimal synthesis conditions determined via single-factor tests and orthogonal experiments, that is, carrying out the acylation at 35℃ for 8h with a n:n: n ratio of 1:1:1.5 and with dimethylformamide as the solvating agent and the thinner.

文中對(duì)綠原酸進(jìn)行了改性，即在堿性催化劑催化的條件下使其與月桂酰氯進(jìn)行非水相的酯化反應(yīng)超碰91成人人做人人爱，得到了脂溶性的綠原酸月桂酸酯最新国产三級片。經(jīng)過單因素及正交試驗(yàn)，確定了最佳合成條件為：以N亚洲爆乳少妇无码激情，N-二甲基甲酰胺作為溶解无遮无挡爽爽免费视频毛片、稀釋劑，綠原酸／月桂酰氯／三乙胺的摩爾比為1：1：1.5亚洲天堂免费看，溫度控制在35℃午夜视频www，反應(yīng)時(shí)間8h。

In this dissertation, preparation of polysubstituted ethene and heterocyclic compounds based on 2-hydroxyalkyl phenyl selenides andα-phenylselenopropionic acid reagents were further investigated as follow: Firstly, O-ethyl-O-vinyl phosphonates were prepared in a one-pot, two-step transformation by Mitsunobu reaction of 2-hydroxyalkyl phenyl selenides with monoethyl esters of phosphonic acid in the presence of diethyl azodicarboxylate and triphenyl phosphine (PPh3) followed by oxidation-eliminatio...

中文摘要：本文主要進(jìn)一步探索了2-羥基烷基苯基硒醚精品黄色视频在线、α-苯硒基丙酸試劑在制備多取代乙烯和雜環(huán)化合物反應(yīng)中的應(yīng)用自拍偷拍制服丝袜，具體研究內(nèi)容和結(jié)果如下：一视色视色影院、在偶氮二羧酸乙酯和三苯膦(PPh3)存在下，苯基-2-羥基烷基硒醚和O-乙基膦酸單酯發(fā)生Mitsunobu反應(yīng)三级特大黄片视频影院大国产农村，無需分離和純化反應(yīng)中間體0792dmz.com，直接使用30 %的雙氧水進(jìn)行氧化-消除反應(yīng)，提供了&兩步欧美一级特黄大片做受在线观看人人操、一鍋&合成O-乙基-O-乙烯基膦酸酯的新方法国产免费A片地址，該方法反應(yīng)條件溫和，操作簡便90后久久综合九色综合，產(chǎn)物收率良好(76-82 %)午夜黄色网a。