In this paper, Claisen condensation of isochroman ?4?one as starting material with diethyl oxalate is carried out to form β?diketone compound of isochroman ?4?one.

以異色滿(mǎn)酮 4為起始原料，經(jīng)Claisen縮合得其β二酮衍生物国内偷拍偷拍讨厌图片视频，再與水合肼進(jìn)行Knorr反應(yīng)環(huán)合成 3 乙氧甲趸粕玏WWXX；?3 肼甲酰基異色滿(mǎn)并吡唑衍生物欧洲熟妇色XXXX欧美老妇，通過(guò)酰肼與糠醛反應(yīng)成腙后欧美大片www，分別與巰基乙酸和氯乙酰氯反應(yīng)合成了標(biāo)題化合物

Cephalotaxine ester of 2-oxo-6-methylheptanoic acid was treated with lithium diisopropylamide and Me O-(1-methoxyisopropyl)glycolate to give a mixture of homoisoharringtonine and its stereoisomers with 56% yield. The four stereoisomers separated by TLC showed identical mass spectra and almost superimposed IR but with different 1H NMR spectra. The configuration of the 2'-C and 3'-C of the four isomers were postulated based upon their 1H NMR spectra as compared with the 1H NMR spectra of isoharringtonine and its stereoisomers.

2-氧代-6-甲基庚酰基三尖杉?jí)A(3)與0-(1-甲氧基異丙基)羥基乙酸甲酯(4)在強(qiáng)堿性試劑二異丙胺鋰存在下欧美三级在线手机版费观看，起親核加成反應(yīng)日韩av免费a片网站，反應(yīng)中間體5在室溫用酸性丙酮水解，得到一種新的三尖杉酯類(lèi)生物堿一一高異三尖杉酯堿(6c)及其立體異構(gòu)體(6awww886ys.com、6b欧美熟妇XXXXX色熟妇Y、6d)的混合物日韩欧美视频一区二区三区，產(chǎn)率56%亚洲精品人成中文毛片、通過(guò)制備薄層層析分得這四個(gè)立體異構(gòu)體，它們的1H NMR和異三尖杉酯堿及其立體異構(gòu)體的1H NMR類(lèi)似日韩欧美综合在线视频，推定了它們的絕對(duì)構(gòu)型可以直接看的毛片。

There are different methyl branch structures correlated with isomerous nonyl of NP in the alkyls. The primary metabolites from the dominant bacteria experiment have alkyl phenols and benzene acetic.

研究結(jié)果表明，活性污泥降解壬基酚的初級(jí)代謝產(chǎn)物主要為C4～C6烷基取代苯酚99久久精品国产首页免费，烷基鏈的結(jié)構(gòu)差異與其母體壬基的異構(gòu)方式有關(guān)在线观看v片免费视频小说，烷基上的支鏈主要為甲基；優(yōu)勢(shì)降解菌群代謝壬基酚的初級(jí)產(chǎn)物除烷基苯酚外巨胸流奶水视频网站，還有苯乙酸等国产日本一区二区在线视频。

Phenetole ;α-oxo-p-ethoxyphenylacetic acid ethyl ester ; ethyl-2-（p-ethoxyphenyl） propenoate ; synthesis

苯乙醚；α-羰基-對(duì)乙氧基-苯乙酸乙酯看亚洲免费美女黄片； 2-對(duì)乙氧基苯基丙烯酸乙酯最新麻豆精品视频；合成

Main production and management projects: piperonyl butoxide, Piperonal aldehyde, C Piperonyl aldehyde, PMK, eucalyptus oil, according to pituitrin, citral, ionone, cubeba oil, Geranium oil, 99 % natural a bit terpineol, pine oil acetate, sassafras oil, natural spices; run: Fragrance, tobacco flavor, food flavor, natural flavor essence seasoning products.

胡椒基丁醚、洋茉莉醛人人揉揉揉揉揉日日、胡椒基丙醛免费人成视頻在线播放、胡椒基甲基酮、桉葉油秋霞理论久久理论电影、按葉素一个人看的免费无码视频网站、檸檬醛性生活黄色网站、紫羅蘭酮、山蒼子油色色色色色色色色色色色色色婷婷、香葉油A片视频网站免费观看、99%天然甲位松油醇、乙酸松油脂av免费真人、黃樟油等天然香料在线日韩素人自拍网站免费观看网址；兼營(yíng)：日化香精、煙用香精久久久综合、食用香精国国内自拍A片免费观看、調(diào)味品香精等天然香精產(chǎn)品等。

Phenyl or m -tolyl selenoamides reacted with functionalized α-haloacetic acid in 1∶1 or 1∶2 molar ratio with no catalyst in various alcohols to undergo a selenium transfer reaction. This reaction in dif-ferent molar ratios furnished the same C—Se—Se—C coupling products with a special structure bis diselenide. A new and facile method for synthesis of such bis(alkoxycarbonyl-methyl) diselenides with the advantages of mild reaction conditions, high yields, easy availability of starting materials and good chemical selectivity was provided.

芳基硒代酰胺與氯乙酸在各種醇中無(wú)催化劑下以1∶1和1∶2的比例投入十八岁一上看的黄片，發(fā)生硒轉(zhuǎn)移反應(yīng)国产黄片精品a片3p，不同原料投入比下的反應(yīng)生成了同一種C—Se—Se—C偶聯(lián)產(chǎn)物——具有多功能團(tuán)的二烷氧羰基甲基二硒醚，提供了一種新的合成二烷氧羰基甲基二硒醚的簡(jiǎn)便方法迷奸视频网站，且反應(yīng)具有條件溫和天堂网av资源www、產(chǎn)率高、原料易得和選擇性好等優(yōu)點(diǎn)九色永久地址。

Resin transfer molding mould was manufactured with bisphenol-A epoxide vinylester resin as matrix,poly as low shrinkage additive and glass fiber tricot as reinforcing material,according to the basic requirement of matrix resin of RTM mould.

根據(jù)樹(shù)脂傳遞模塑模具對(duì)基體樹(shù)脂的基本要求黄片、com好吊操视频，選用雙酚A環(huán)氧乙烯基酯樹(shù)脂為基體，聚乙酸乙烯酯為低收縮添加劑国产真实偷人视频在线看，玻璃纖維經(jīng)編織物為增強(qiáng)材料自拍偷拍15，并加入相應(yīng)的助劑，制備了復(fù)合材料RTM模具一级片的视频。

Regarding polyurethane varnish as host of the formaldehyde absorbent,mainly aminoacetic aicd , casein, tannins, L - glutamate, DL - a - amino acid, urea, hexamethylenetetramine, lignin and molecule are chosen to serve as formaldehyde absorbent.

以硝基清漆為吸收基質(zhì)欧美精品一区二区观看，主要選擇了如氨基乙酸、干酪素久久2视频、鞣質(zhì)99超碰免费、L-谷氨酸、DL-α氨基丙酸欧美伊人久久大香线蕉综合69、尿素一本道在线免费观看无码一区二区、六次甲基四胺、木質(zhì)素日韩妓女精品影院视频播放在线观看、分子篩等作為甲醛吸收劑亚洲精品永久中文字幕，涂布于聚氯乙烯膠片上做甲醛吸收測(cè)試；根據(jù)測(cè)試結(jié)果插插国产，制作的甲醛吸附劑能起到較好的甲醛吸收效果99久久免费精品国产精品九九；并探討了硝基清漆中吸收劑用量的篩選及吸收時(shí)間對(duì)甲醛消除的影響因素。

New ruthenium benzylidene complexes benzylidene[1,3-bis(2,6-dimethylphenyl)-4,5-dihydroimidazol-2-ylidene] [k~2-diphenylphosphinoacetato] monochlororuthenium (46), benzylidene[1,3-bis(2,6-dimethylphenyl)-4,5-dihydroimidazol-2-ylidene][k~2-3-propionato]monochlororuthenium (47), benzylidene[1,3-bis(2,6-dimethylphenyl)-4,5-dihydroimidazol-2-ylidene] [k~2-2-benzonato]monochlororuthenium (48) featured five-membered, flexible six-membered and rigidsix-membered chelating rings respectively are prepared by reactions of complex 41 withcorresponding sodium phosphino-carboxylates. It is confirmed by X-ray crystallographicanalysis that the coordination geometries of complexes 46 and 47 are distorted squarepyramids with phosphino-carboxylate ligands chelating to ruthenium, and the coordinationbetween ruthenium and benzylidene ligands are strengthened.

用二苯基瞵乙酸鹽超碰在线妓女、二苯基膦丙酸鹽又粗又大又长又硬起来了、二苯基膦苯甲酸鹽與釕卡賓配合物41反應(yīng)合成了三個(gè)新的釕卡賓配合物：含五元膦-氧螯合環(huán)的1国产国产成年年人免费看片，3-二-(2，6-二甲苯基)-4欧美三级高清在线，5-二氫咪唑基1-苯亞甲基--一氯合釕(46)狼友视频在线免费、含六元柔性膦-氧螯合環(huán)的[1，3-二-(2AAAAAAAAA性关系视频，6-二甲苯基)-4在线污网站，5-二氫咪唑基1-苯亞甲基--一氯合釕(47)及含六元?jiǎng)傂造?氧螯合環(huán)的[1，3-二-(2欧美性爱直播，6-二甲苯基)-4婷婷五月综合800，5-二氫咪唑基]-苯亞甲基--一氯合釕(48)。X射線(xiàn)單晶衍射分析證明igao日韩无码，配合物46免费涩涩在线视频网、47都為變形的四方錐構(gòu)型，膦-氧與釕形成螯合配位日韩一区在线观看，其中苯亞甲基與釕的配位得以加強(qiáng)美国一级牲交黑大粗硬大片学校。

A series of novel chiral aminophosphine ligands with binaphthyl backbone and partially reduced binaphthyl backbone were synthesized from optically pure NOBIN and H〓-NOBIN respectively. The effects of binaphthyl backbone and substitutes at the phosphorous atom on Pd (0)-catalyzed allylation of racemic 1, 3-dipheylprop-2-en-1-yl acetate with dimethyl malonate were systematically investigated.

從NOBIN出發(fā)合成了一系列膦上含有不同取代基的氮膦配體MAPs以及含有被部分還原的聯(lián)萘骨架的氮膦配體H〓-MAPs，將此兩類(lèi)配體運(yùn)用于鈀催化的乙酸1日韩手机福利写真网站，3-二苯基烯丙基酯與丙二酸二甲酯的反應(yīng)中欧美一级爽爽爽www，考查了膦上取代基和配體骨架對(duì)反應(yīng)的影響。