Especially , the rearrangement reaction of converting styrene oxide to phenylacetyldehyde were investigated. In this paper, we also studied the method of preparing SO42-/TiO2 by vitriolic titanium boiling regurgitant hydrolyzation and applications of SO42-/TiO2 in the preparation of iso-amyl acetate.

對環(huán)氧苯乙烷經(jīng)分子重排反應制備苯乙醛進行了深入研究；本論文還用硫酸鈦沸騰回流水解法制備了納米SO_4~(2-)/TiO_2固體超強酸粉末欧美肏屄网，并應用于冰乙酸與異戊醇酯化合成乙酸異戊酯的反應免费欧美在线。

RESULTS: 12 compounds were isolated and identified as aurantiamide acetate (1), aurantiamide benzoate (2), physcion (3), scopoletin (4), vanillin (5), coniferyl aldehyde (6), syringaldehyde (7), syringic acid (8), luteolin (9), apigenin (10), azelaic acid (11), dotriacontanic acid (12), respectively.

結(jié)果：從羊耳菊全草的氯仿和乙酸乙酯部分共分離得到12個化合物，分別鑒定為橙黃胡椒酰胺乙酸酯(1)黄色一级无码AV，橙黃胡椒酰胺苯甲酸酯(2)黄页网站视频在线看，大黃素甲醚(3)，東莨菪亭(4)一级欧美黄片在线播放，香草醛(5)aa精品视频在线观看，松柏醛(6)，丁香醛(7)先锋影音无码资源，丁香酸(8)欧美A片久久，木犀草素(9)，芹菜素(10)欧美日韩在线A片一区二区，壬二酸(11)最近免费中文,最近免费中文字幕大全，三十二烷酸(12)。

Using silicotungstic acid as catalyst with the catalyst supported on active carbon,2-methyl-2-ethyl-acetic-1,3-oxathiolane(targeted compound I,an aroma compound with apple flavor )was synthesized by the reaction of ethyl aceto-acetate and 2-mercapto-ethanol.

以活性炭固載硅鎢酸作為催化劑欧美精品欧美极品欧美视频，用乙酰乙酸乙酯與巰基乙醇縮和合成了具有濃郁蘋果香氣的香料化合物2-甲基-2-乙酸乙酯基-1免费1级毛片高1级毛片视频了，3-氧硫雜環(huán)戊烷。

There is no remarkable difference for removing proteins as consideration of de-protein rate at pH 2.5 of hydrochloric acid(69.55%) and trichloro acetic acid(73.73%).

三氯乙酸和鹽酸在pH 2.5時的脫蛋白率分別為73.73%和69.55%熟妇激情内激情内射图片，差異不顯著美女野外后λ式动态图片搜索，實際生產(chǎn)中可用鹽酸替代三氯乙酸進行脫蛋白處理。

A method for the direct determination of auxins, indole acet ic acid,indole-butyric acid and naphthylacetic acid, by gas c hromatography with wide-bore capillary column is described.

建立了一種采用530 μm大口徑毛細管色譜柱欧美巨大XXXX做受高清、不經(jīng)衍生化處理而直接測定吲哚乙酸夜夜爽88888妓女性视频、吲哚丁酸和萘乙酸等植物生長素的氣相色譜分析方法。

Result: The anticancer active component includes: taxol 9.45%麻豆av免费在线、cephalomanine: 9.63%国产ΑV天堂在线观看免费、10- deacetylbaccatinⅢ: 22.64%、total flavonoids: 19.15%. 3. The preparation of Seiadopitysin control Methods: Take dry Ginkgo leaves and extracted three times by sonication with 95% EtOH, solutions were concentrated under vacuum, after defatting by petroleum benzin, the sample was extracted with EtOAc and the solutions were concentrated under vacuum.

金松雙黃酮對照品的制備方法：取干燥銀杏葉以95％乙醇超聲提取3次又黄又粗又长一区二区视频，提取液合并欧美一二区夜夜嗨影音先锋，減壓濃縮，石油醚脫脂后久久久这里精品国产，用乙酸乙酯萃取91无码视频在线专区，萃取液減壓濃縮色妓女网站，經(jīng)硅膠柱(6cm×80cm)層析，石油醚-乙酸乙酯(9∶1～5∶5)梯度洗脫91最新黄色视频网址资源，產(chǎn)物用甲醇多次沖淋欧美日韩国产黄色，再以二甲基甲酰氨溶解，反復重結(jié)晶黄色视频免费入口处在线观看，得黃色粉末結(jié)晶涩涩网站视频。

DPPH method, pyrogallol method and Fenton reaction were used to study the scavenging ability of extracts with 95% ethanol, ethyl acetate, acetone, acetic acid, chloroform, methanol to free radical activity.

方法］應用DPPH法、鄰苯三酚自氧化法和Fenton反應分別研究了濃度95%乙醇亚洲最大黄色一及片、乙酸乙酯操逼视频网站网站视频网站、丙酮、乙酸国产福利不卡、氯仿人人人人人人人人人人艹、甲醇提取物清除自由基活性的能力。

The pots and pans: each batch of take part has joined acetic acid (4%) and the top edge Hing, boiled, 30min 0.5cm, date-stamping, when heated to keep micro-boiling, and finally add acetic acid (4%) to the original volume, placing 24h at room temperature, pour into the above lixivium clean test for forcarbonated.

炊具：每批取二件射视频色草，分別加入乙酸(4%)至距上邊緣0.5cm處国产大全色婷婷五月月天，煮沸30min，加熱時加蓋欧美成了人片A片免费，保持微沸女人腿张开让男人桶爽动态图片，最后補充乙酸(4%)至原體積，室溫放置24h后欧洲免费网站看黄，將以上浸泡液倒入清潔的玻璃瓶中供測試用特级a爱片免费观看。

Purified sucralose-6-acetate which had been recrystallized was hydrolyzed in th system of sodium methoxide/methanol solution, and the mixture was quenched with H+ ion exchange resin, and cake was washed with methanol. The eluate was concentrated to remove methanol and methyl acetate. The aqueous solution was decoloured with active carbon. The filtrate solution was concentrated and crystallized above 38℃for sever hours, the product sucralose was collected.

重結(jié)晶的三氯蔗糖-6-乙酸酯于CH3ONa/CH3OH體系中醇解，用H+型陽離子交換樹脂中和激情的小说视频，蒸去甲醇日韩欧亚自拍视频在线播放免费观看、乙酸甲酯等，在水相中用活性炭脫色亚洲网站A，水溶液經(jīng)濃縮黄网站无码男人免费大全，在38℃以上結(jié)晶數(shù)小時，分離得三氯蔗糖国产小视频一区二区在线播放。

The major occupational hazards factors in printing ink were benzene, toluene, xylene, ethylbenzene, solvent gasoline, methanol, alcohol, isopropyl alcohol, ethyl acetate, butyl acetate, butyl acetate, dichloromethane, etc. 10 of 1224 samples (0.82%) exceeded the national occupational health standards.

印刷油墨中存在的職業(yè)病危害因素種類主要有苯三级艹逼精品、甲苯、二甲苯在线视频区、乙苯国产后入式免费视频、溶劑汽油、甲醇1688在线啪国自产视频、乙醇91不卡在线精品国产、異丙醇、乙酸乙酯、乙酸丁酯可以进去的黄片、二氯甲烷等亚洲zaixianguankan，檢測樣品總數(shù)1224件，超標樣品數(shù)10件成人av小姐网站在线电影，超標率為0.82%一区二区欧美房事。