In this thesis, a convenient and efficient synthesis of highly functionalizeddihydropyrido[2,3-d]pyrimidines via a double [5 + 1] annulation strategy startingfrom easily available α-alkenoyl-α-carbamoyl ketene--acetals 1 and cheapreagents (NH4OAc, DMF, and POCl3) has been developed.

本論文探索了一種簡(jiǎn)便有效的合成高度官能化的二氫吡啶并[2在线视频一区亚洲，3-d]嘧啶的方法日e色视频在线观看，此方法由易得的α-乙酰基-α-氨基乙蹙啪派蘼刖吠基二硫縮烯酮1和便宜的試劑(醋酸銨欧美性视，二甲基甲酰胺和三氯氧磷)通過(guò)兩步[5 + 1]加成而實(shí)現(xiàn)。

Preparation of ethylene bis stearamide using stearyl chloride and ethylenediamine as raw materials has been studied.

研究了以乙二胺和硬脂酰氯為原料制備乙撐雙硬脂酰胺的反應(yīng)涩涩视频在线观看十八岁以下勿进，討論了原料配比欧美曰屁视频、反應(yīng)時(shí)間、反應(yīng)溫度的影響日韓美女一級黃片免費。

Solubility measurement shows synthesized benzyl alginate was soluble in formamide, glycol, propylene glycol, and water, a...

試驗(yàn)表明最新精品国偷自产在线97，合成的褐藻酸芐酯可溶于甲酰胺，乙二醇www..com黄色A片免费观看、丙二醇和水黄片一级域名，在二甲基甲酰胺中可被溶脹。

Ten kinds of metal and three kinds of organic templates, including ethylenediamine, 1,4-butylenediamine and pyrazine were used in the synthesis of metal phosphonate coordination polymers.

在所合成的16種金屬有機(jī)膦酸鹽配位聚合物中欧美性爱,亚洲，有機(jī)配體為2-羥基乙趸埔惩?688www欧洲人妻毛片；⑺幔糜谂湮坏慕饘匐x子共10種三级片在线无码，模板劑3種分別為乙二胺(en日韩黄色视频品爱，1，4-丁二胺免费av色色播放，哌嗪色五月天天。

Temperature-sensitive hydrogels P(NIPA-co-DiAB) with aromatic group as hydrophobe was were prepared by free radical micellar crosslinking copolymerization with N-isopropyl acrylamide, N,N-dially benzylamine as comonomers, N,N-methylene-bis-acrylamide as crosslinker, sodium dodecyl sulfate as surfactant and ammonium persulfatetetramethylethylenediamine as initiator system.

以N-異丙基丙烯酰胺、N一级特黄国产在线视频，N-雙烯丙基芐胺為共聚單體97AV视频在线观看、N，N-亞甲基雙丙烯酰胺為交聯(lián)劑亚洲一区二区无字幕、十二烷基硫酸鈉為表面活性劑、過(guò)硫酸銨-四甲基乙二胺為氧化還原引發(fā)體系黄色网站在线可免费播放国产的，采用自由膠束交聯(lián)共聚法合成了疏水基團(tuán)為芳香基的疏水改性溫敏性智能水凝膠P(NIPA-co-DiAB)日韩国产欧美亚洲。

Synthesis process of 2,6-dichloro-3-methylaniline was investigated 3-methylaniline was first N-acetylated with acetic anhydride,then treated with chlorosulphonic acid and ammonia yielding the 2-methyl-4--benzenesulfonic amide,which wasin turn deacetylated,chlorinated and hydrolyzed to the title compound.Hydrochloric acid was used instead of sodium hydroxide in deacetylation and sodium chlorate instead of hydrogen peroxide as oxidant in chlorination.

合成工藝2，6-二氯-3-甲基苯胺調(diào)查3-甲基首次N-乙酰與醋酸酐青青国产香蕉依人在线观看，然后與氯磺酸和氨產(chǎn)量 2-甲基-4--苯磺酰胺基乱中年熟女伦av一区，而擅轉(zhuǎn)乙酰一级黄色一级，氯化和水解的標(biāo)題compound.hydrochloric酸代替氫氧化鈉乙酰氯酸鈉代替雙氧水為氧化劑，加氯欧美曰人人操人人干。

The diluent contain magnesium chloride, potassium citrate, sodium glutamate, dipotassium hydrogen phosphate, monopotassium phosphate and fructose, semen vitality is hightest after frozen.The average value is 0.52,highter than other 5 diluent significantly (P﹤0.01).So chose this diluent as semen cryopreservation diluent on chicken. Definite cryoprotectant, equilibrium time and thaw temperature:On the base of test one,research freeze sheltering effect about glycerin, DMSO ,DMA and DMF, each with 4 consistency.The result showed that 10%DMSO sheltering effect is the best, the next is 4%DMA,semen vitality are 0.58 and 0.55 after frozen.

冷凍保護(hù)劑亚洲无码熟妇黄色视频、平衡時(shí)間和解凍溫度的確定在試驗(yàn)一的基礎(chǔ)上，研究甘油国产av福利第一精品、二甲基亞砜手机在线视频日韩一区、二甲基乙酰胺、二甲基甲酰胺4種冷凍保護(hù)劑在4種濃度下對(duì)雞精子的冷凍保護(hù)作用久久婷婷五月综合国产，結(jié)果表明5060午夜全黄一级A，10%DMSO保護(hù)效果最好，其次為4%濃度的DMA国产精品视频网站大全，精液凍后活力分別為0.58和0.55久久免费视频精神品，兩者之間差異不顯著(P﹥0.05)。

The solvents commonly used in the solvothermal synthesis include alcohols (such as methanol, ethanol, isopropanol, alcohol, ethylene glycol, glycerine, etc.), amines (such as hexamethylenediamine, dimethylformamide, triethanolamine), Acetonitrile and Propionitrile, the differences of functional groups, varieties of kinds together with a wide differences of polarity, dielectric constant and boiling point of organic solvents greatly increase the diversities of the product.

溶劑熱合成常用的溶劑有醇類(lèi)(如甲醇一级黄色网站视频官段、乙醇欧美特黄特级作爱大片免费观看、異丙醇、正丁醇裸体美女黄十八禁免费网站、乙二醇人人操人人爱人人插、甘油等)，胺類(lèi)(如己二胺一区二区美女脱黑色丝袜视频、二甲基甲酰胺原创国产、乙醇胺)，乙腈和丙腈等日韩特黄Av毛片免费播放，有機(jī)溶劑由于帶有不同的官能團(tuán)色惰日本人哺乳奶水视频网1，種類(lèi)繁多，具有不同的極性国产女人A片免费视频、介電常數(shù)欧美成电影网、沸點(diǎn)等，大大增加了合成產(chǎn)物的多樣性美女操逼特级黄片。

They are insoluble in water, ethanol, methanol, acetone, chloroform and benzene, but soluble in DMA, DMF and DMSO.

它們?nèi)苡贜免费黄色三级性交，N-二甲基甲酰胺、N高清无码巨乳人妻，N-二甲基乙酰胺和二甲基亞礬等溶劑美欧三级，但不溶于水、乙醇呦呦资源在线、甲醇欧美日韩国产在线va、丙酮、氯仿和苯午夜淫荡。

Cellulose benzoate,the degree of substitution of which was calculated from the content of C determined by element analysis,was prepared from microcrystalline celluloseand benzoyl chloride under heterogeneous condition and characterized by FT-IR and~1H-NMR.

研究了微晶纖維素和苯甲酰氯在多相條件下合成制備纖維素苯甲酸酯的反應(yīng)6080三级午夜理论，通過(guò)元素分析所得碳的質(zhì)量百分含量計(jì)算了產(chǎn)物的取代度永久区域18勿进，并系統(tǒng)研究了吡啶與N，N-二甲基乙酰胺或與三乙胺混合反應(yīng)溶劑国内偷拍高清精品免费视频、苯甲酰氯與纖維素羥基的摩爾比r天堂不卡一区二区在线网站、反應(yīng)溫度和反應(yīng)時(shí)間對(duì)D S的影響，用FT-IR和1H-NM R對(duì)產(chǎn)物進(jìn)行了表征深夜在线。