In the present paper, regiospecific aryl nitration and consequent derivation of meso-tetraarylporphyrins were studied.

本論文對(duì)meso-四芳基卟啉芳環(huán)的定位硝化反應(yīng)及其衍生物的合成進(jìn)行了研究中国免费三级片视频网站。

The results of the experiments show that substituted aryl ethers that containing nitro group (-NO2) are easy to take place nucleophilic substitution in the alkaline medium and then aryl etherbond is cleaved.

實(shí)驗(yàn)結(jié)果表明，含-NO_2的取代芳基醚A片视频观看，在堿性溶液中国产一级视频在线观看免费，易發(fā)生親核取代反應(yīng)，從而使芳醚鍵斷裂亚洲日韩熟妇自拍图片。

The reaction of the compound - 3 - triaiylstannyl -1,1 - diphenyl - 2 - propenyl - 1 -ol with ICl,Br2,I2 formed organotin halides ,which reacted with KOH to form organotin oxide or hydroxide.

首次以非碳環(huán)醇-3-三芳基錫基-1jjzzz国产，1-二苯基-2-丙烯基-1-醇[Ph_2 CCH=CHSnAr_3]和鹵素或擬鹵素發(fā)生取代反應(yīng)得到鹵化物，并以此合成了氫氧化物插入阴道视频、氧化物和配合物日韩精品一区二区熟女视频。

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的比例投入人人尻人人操,人人尻人人操,人人尻人人操，發(fā)生硒轉(zhuǎn)移反應(yīng)，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亚洲第一精品在线，提供了一種新的合成二烷氧羰基甲基二硒醚的簡(jiǎn)便方法三级网站免费观看，且反應(yīng)具有條件溫和、產(chǎn)率高肏屄视频在线免费观看、原料易得和選擇性好等優(yōu)點(diǎn)无码精品视频仙踪林。

Analytical results showed that the upper clear liquid of pyrolysis oils was mainly consisted of water-soluble substances,such as phenol,cresol,xylenol,sugars,hydantoins,morpholines,pyranones and pyridine derivatives compounds,etc.,while the lower sediment was mainly insoluble or hardly water-soluble substances,such as the big substituent phenolics(the number of substituent carbon atoms of which is greater than or equal to 2),aryl phosphate esters,fatty acid esters and nitrile compounds,and so on.

研究表明，熱解油上層清液主要是一些較易溶于水的物質(zhì)亚洲精品国产欧美一二，如苯酚国产全黄A一级毛片电瓶、甲酚、二甲酚www.riav7、糖類www.18禁网站、乙內(nèi)酰脲類、嗎啉類免费人人插操摸、吡喃酮類和吡啶類化合物等免费A级不卡在线毛片；而下層沉淀則主要為不溶或難溶于水的物質(zhì)，如大取代基酚類（取代基碳原子數(shù)≥2）黄片免费在线看吗、磷酸三芳基酯類国产自愉怕一区二区、脂肪酸酯類和腈類化合物等。

A series of methyl 2,7,7-trimethyl-5-oxo-4-aryl1,4,5,6,7,8- hexahydroquinoline -3-carboxylate were synthesized by the reaction of aromatic aldehydes,dimedone and methyl acetoacetate using ammonium acetate as catalyst in glycol under microwave irradiation with 82%～98% yields in 4～6 min.

微波輻射下以芳醛免费三级性毛毛片、達(dá)咪酮自拍偷拍第七页、乙酰乙酸甲酯為原料，乙二醇為溶劑亚洲国产男男女女AV网址在线播放，醋酸銨為催化劑合成了一系列2我要看狼友黄色视频，7，7-三甲基-5-氧代-4-芳基-1欧美性爱一页，4你懂得在线免费观看网站，5，6久久久精品94久久不卡，7人成777777免费视频色，8-六氫喹啉-3-羧酸甲酯化合物，反應(yīng)時(shí)間4~6 min国产高清无码一二三四五，產(chǎn)率82%~98%91华人精品自拍。

The invention concerns a process for preparing heterocyclic carbenes of general formula in which R1, R2, R3 and R4 are identical or different and mean saturated or unsaturated, straight-chain, branched or cyclic, unsubstituted or substituted C1-C10 alkyl, C2-C5 alkylidene, C2-C5 alkylidine, C7-C19 aralkyl or C6-C14 alkyl groups, R3 and R4 can also stand for hydrogen or form jointly anellated, substituted or unsubstituted groups with between 3 and 7 carbon atoms and X stands for carbon or nitrogen, R3 being dropped if X is nitrogen.

本發(fā)明涉及一種制備通式Ⅰ的雜環(huán)碳烯的方法，其中在通式Ⅰ中黄网页在线，R1又粗又长又硬的裸交视频、R2、R3和R4是相同的或不同的，并且是飽和的或不飽和的18岁黄网，直鏈欧美性爱视频在线观看精品、支鏈或環(huán)狀的，未取代或取代的C1－C10－烷基免费国产自在线拍、C2－C5－亞烷基人人摸人人色人人操视播放、C2－C5－次烷基、C7－C19－芳烷基或C6－C14－芳基基團(tuán)免费又大又粗又爽的视频，R3和R4可以是氫或它們一起形成具有3－7個(gè)碳原子的稠合的91精品福利区在线观看、取代或未取代的基團(tuán)，X是碳或氮黄色视频久久久久，并且當(dāng)X是氮時(shí)欧美老人激情综合网欧美综合激情，不存在R3。

A series of liquid crystals containing naphthalene 1~13 was synthesized by the reaction of carbonyl compound with Grignard reagent and coupling reaction between phenyl boronic acid and halogen naphthalene .

經(jīng)羰基化合物與格氏試劑反應(yīng)及芳基硼酸與萘基鹵化物偶聯(lián)反應(yīng)合成了系列含萘環(huán)骨架液晶化合物1~13射一射人人操一操；產(chǎn)率在73%~759%18禁片免费网站在线看。

Diaryl nitroxides are even more stable than the dialkyl nitroxides.

二芳基氮氧化物自由基比二烷基氮氧化物自由基還要穩(wěn)定。

In this dissertation, after combining the high stability of C9 diaryl substituted fluorene derivatives with the high carrier mobility and hole-injection ability of pyrene, a series of novel blue-light-emitting materials were designed and synthesized.

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