According to the appraisal of ablate resistant resin,the properties and application of modified phenolic resin s and PAA etc new ablate resistant resin are Introduced.

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Moreover, the polymeric arsine palladium(0) complex is an efficient catalyst for the carbonyl allylation of aldehydes and the coupling reaction of aryl halides with terminal alkynes or Grignard reagent.

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In this study, main chain of 4,4'-Biphenol combine different side chains to discuss polymer ~ polymer which synthesizes by the difference of structure of 1-Bromobutane经典三级人人操、1-Bromoocatane、1-Bromododecane.To examinate luminance property and judge the correction for the structure of polymer ~ polymer by FT-IRav在线官网、NMR-1H免费人成网站免费看视频、UV、PL, in the meanwhile,to investigate into radiation wavelength under the condition of different side chains.

中文摘要 1美女被cao的网站免费。本實(shí)驗(yàn)是利用497人妻a，4'-Biphenol為起始物，與Allyl bromide反應(yīng)小草无码免费视频，產(chǎn)生丙烯基芳基醚化合物，再利用克萊森重排反應(yīng)將丙烯基轉(zhuǎn)至鄰位国产无遮挡又黄又爽不卡，然后在將OH基轉(zhuǎn)變?yōu)椴煌滈L的烷基醚合成出聚合物耤I）在线网址你懂的，以FT-IR、NMR-1H国产原创精品无遮挡v视觉影院、UV91网站在线观看国产一区、PL測定其發(fā)光性質(zhì)及判斷產(chǎn)物結(jié)構(gòu)是否正確，并探討化合物在不同側(cè)鏈之條件下久999，比較其放射波長99热网址。

Bulky and electron-rich MOP-type phosphine ligand 2-ditertbutylphosphino-2'-isopropyloxy- 1,1'-binaphthyl (L1) shows good catalytic activity in palladium-catalyzed α-arylation of 1,3-dicarbonyl compounds.

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Bulky and electron-rich MOP-type phosphine ligand 2-ditertbutylphosphino-2 -isopropyloxy 1,1 -binaphthyl (L1) shows good catalytic activity in palladium-catalyzed α-arylation of 1,3-dicarbony compounds.

富電子、大位阻MOP型烷基膦配體2-二叔丁基膦－2'-異丙氧基－1欧洲美州亚洲妇女操b黄色视频，1'-聯(lián)萘(L1)在鈀催化的1久久精品兔费99国产精品，3-二羰基化合物的α-芳基化反應(yīng)中顯示了較好的催化活性。

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

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From the photophysical behaviors of 1, 3, 4-triaryl-2pyrazoline compound (TPP16) at low temperature, it can be considered that the twisted configuration between pyrazoline ring and the non-substituted phenyl group on the position 1 is the fluorescence configuration of conjugated system Ⅰ, and the twisted configuration between pyrazoline ring and P-nitrobenzene group is fluorescence configuration of conjugated system Ⅱ.

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In thesecond chapter, eleven 1,3,4-oxadizoles bearing chiral pyrazolyl moieties(4a-k) andfive triazolotriazines bearing chiral pyrazolyl moieties(5a-e) were obtained from5-[(1"S)-1",2-diacetyl-oxyethyl]-1-phenylpyrazol-3-carboxaldehyde(1) with arylcar-bohydrazide or (5-aryl-1,2,4-triazin-3-yl)hydrazine through an intramolecular1,3-dipolar cycloaddition in the presence of the non-metal oxidant IBD.

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Based on the experimental results, it could be consequentially concluded that N-methoxycarbonylation of aromatic amines was followed by the exclusive N-methylation of methyl N-aryl carbamates during the reaction process.

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A base-catalyzed novel olefination methodology based on elimination of p-toluenesulfonamide:Treatment of diethyl cyanomethylphosphonate with catalytic amount of basegave the corresponding phosphoryl-stabilized carbanion, which added to the carbon-nitrogen double bond of N-tosyl imines.

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