During the reaction of alkylation, general contained 0.2%~2.0% butadiene will produce viscous heavy composite materials, which will raise final boiling point of alkylate and decrease octane, what is more, it will react with acid to produce corresponding ester, which will increase the consumption of acid, Therefore, we must remove butadiene by selective hydrogenation, at the same time, it will convert some of 1- butane to 2- butane by isomerization and raise octane of alkylate.

一般含有0.2%~2.0%的丁二烯国产专区在线操，其在烷基化反應(yīng)中，可生成一種分子量很高的粘稠重質(zhì)迭合物国产男女猛烈无遮挡免费视频网站，使烷基化油的干點升高黄色视频免费播放，辛烷值降低，并且它還和酸反應(yīng)生成相應(yīng)的酯而加大酸耗量色色色黄视频。因此必須經(jīng)過選擇性加氫除掉丁二烯日韩电影成人免费观看网址，同時欧美R18在线，將部分1-丁烯異構(gòu)化為2-丁烯，以提高烷基化油的辛烷值国产第一福利导航。

In the improved process, the stand time of the colored complex is prolonged, measurement can be done between 20 min to 2h after colorization.

改進方法中形成的硅鉬藍絡(luò)合物穩(wěn)定時間長亚洲色图中文字幕一区，可在顯色后 2 0min到 2h之內(nèi)進行測定，3個樣品平行測定的相對偏差僅為 3 %日韩AV论理论片免费观看，加標(biāo)回收率為 95 %～ 10 3 %日本国产中文字幕，最大相對誤差為 5 0 %。

The calculated results suggest that the ethynyl ...

計算結(jié)果表明黄色网站免费能看的网站，反應(yīng)物中自由基C2 H中的邊端C進攻O2 形成了中間體 1 2019最新在线观看黄色，中間體 1是一個加合產(chǎn)物。

Methods In view of the selective accumulation of porphyrin derivatives in tumor tissue, three ftorafur-porphyrin compounds and three metal compounds were designed, and the target compounds were synthesized with satisfied yield via a four-step procedure starting from pyrrol and substituted benzaldehydes.

根據(jù)卟啉對腫瘤組織的選擇性滯留作用2022国产午夜无码视频，設(shè)計了3個卟啉替加氟化合物及3個金屬絡(luò)合物色x色色视频，并以吡咯和取代苯甲醛為原料經(jīng)4步反應(yīng)以滿意的收率得到目標(biāo)化合物。

However, there is no difference for NAT2 rapid and slow acetylator between two groups.

吃紅燒魚因素在NAT2的快速酶中在线手机看片国产精品，特別是在野生純合型中直腸腺瘤復(fù)發(fā)的相對危險度有增高趨勢黄页网站免费观看大全，提示了NAT2〓4等位基因編碼快酶型NAT，可能在紅燒魚產(chǎn)生的雜環(huán)胺類化合物中代謝中加速其N-乙鮳ww.whzjsy.com；x過程免费看黄色网站不卡，從而加速其代謝為終致癌物而與腸粘膜上皮細(xì)胞的DNA產(chǎn)生加成物，損傷其遺傳物質(zhì)国产高清无码网址。

A highly regio- and stereoselective diboration of allenes was achieved with a catalytic amount of phosphine-free Pd complex and alkenyl or aryl iodide.

雙硼試劑加成到1欧美色色成，2雙烯的反應(yīng)，傳統(tǒng)上利用Pt金屬錯合物為催化劑黄色网站中文字幕，根據(jù)文獻的報導(dǎo)www.日本在线，單獨只使用Pd金屬錯合物是無法進行此反應(yīng)的。

But under the same conditions, the reactions of the complex (41) with organic lithium reagents give a kind of novel complexes in which the nucleophile is added to the a-carbon of the phthalazine ring.

然而含有橋羰基的2欧美亚洲一级片，3-二氮雜萘配位的羰基雙鐵絡(luò)合物4l在相同的條件下與芳基鋰試劑反應(yīng)時欧美综合自拍亚洲综合图自拍，芳基鋰卻是親核加成在氮雜環(huán)的α位羰上，生成一類結(jié)構(gòu)獨特的雙氮雙鐵羰基絡(luò)合物啪啪啪www。

The intermediates 2a～2f of cyclic (1-arylseleno)glycerol phosphate and tegafur conjugates were synthesized by one-pot reaction of hexaethyl phosphorous triamide, activated by a catalytic amount of iodine, with (N3-tegafur)alkanol, 1-arylselenoglycerol and sulphur successively in refluxing benzene.

以碘作催化劑曰本人的三级视频，無水苯為溶劑，六乙基亞磷酰三胺依次與羥乙基替加氟一级A做片性视频欧美、1-芳硒基甘油及硫反應(yīng)被男人桶添插，得中間體硒代環(huán)甘油磷脂替加氟綴合物2a～2f。

According to Johnson's Rule and IR spectra, their possible structures are suggested. The bonding parameters of those complexes are calculated by ESR parameters. And the crystal field parameters are calculated by using electronic spectral data. It can be seen that the vanadyl complexes in the solution are ionic complexes and that the α〓 values of those complexes decrease following the increasing of the N donor replacing the O donor of water on the equatorial plane in those complexes. This means that the covalent bonding between vanadium and ligand increases as Ser, Phen or Bipy replace water ligands. The results show the competitive coordinate law that the coordination reactivity of Phen and Bipy is much stronger than that of Ser. The simulation program of ESR is compiled by the theory of ESR in the present work.

測定了VO-絲氨酸二元體系美女黄片丝袜A片、VO-絲氨酸-鄰菲咯啉三元體系和VO-絲氨酸聯(lián)吡啶三元體系在不同酸度下（pH=1.0～14.0）的乙二醇／水（V／V=1：1）溶液低溫ESR譜免费的色视频综合大全，發(fā)現(xiàn)不同pH下，溶液中具有不同組成的配合物国产精品视频免费在线，根據(jù)不同pH下ESR譜的變化国内真实灌醉美女迷醉，利用Johnson的加合規(guī)則并結(jié)合紅外光譜超碰人人操人人舔，推測了它們在溶液中的可能結(jié)構(gòu)；利用波譜參數(shù)計算了配合物鍵參數(shù)久久婷婷激情综合俺也去；利用電子光譜數(shù)據(jù)計算了配合物的晶體場參數(shù)免费,欧美一级视频，討淪了它們的成配特性，結(jié)果表明：VO配合物屬離子型配合物性爱研究院免费视频，隨取代水分子的配體（Ser美女黄网站內裤、Phen或Bipy）數(shù)目增加，鍵參數(shù)減小japanese熟妇与子乱视频，配合物共價性增強国产看片无码精品看片，同時得出這些體系中，生物配體競爭配位規(guī)律：Phen和Bipy與VO的配位能力比Ser強农村免费观看黄色网站。

Thus. Treatment of CR1R2=C=CH2 (R1 = R2 = Me; R1 = H, R2 = n-Bu; R2 = Ph; R2 = cyclohexyl; R2 = cyclopentyl, R2 = C6H5O, R2 = 2-IC6H4O, R2 = 4-IC6H4O) with bisdiborn in the presence of Pd2 (5 mol %) and 3-iodo-2-methyl-2-cyclohexen-1-one (5 mol %) in toluene at 80 oC gave products bearing both vinylic and allylic boron moieties in good to excellent yields.

但我們發(fā)現(xiàn)可以使用Pd金屬錯合物與有機碘化物共同催化下的系統(tǒng)欧美男女爽爽动态图片大全，來進行此種加成反應(yīng)。溶劑的選擇以甲苯為最佳91精品国产91久久综，Pd錯合物以沒有強配位基存在為最好的選擇久久9999久久免费精品国产9。