醌氢醌

The different substitutes had an effect on the main form of β-diketones, making the hydrogen donors to chloranil different correspondingly.

二酮类化合物中的不同取代基会影响其主要存在形式，因而使得四氯苯醌夺取氢的对象也有所不同。

In the process, chloranil firstly was excited to singlet state and then a labile hydrogen abstraction interaction between singlet chloranil andβ-diketones was involved to form singlet stable neutral radical pairs.

光照作用下，四氯苯醌首先跃迁至单线态，然后夺取β二酮类化合物分子中的活泼氢，形成单线态中性自由基对。

Molecular configurations in LB films undergo change from keto form to zwitterion assurface pressures increase,companied by intermolecular hydrogen bonds decreaseand intramolecular hydrogen bonds increase.

在LB膜中，随表面压增加，分子间氢键减少，分子内氢键增加，SBC18头基构型在转折区发生醌式→双性离子构型转变。

When surface pressures are lower than the turnover(5～30mN/m),intermolecularhydrogen bonds were formed with keto form and phase transition was higher ca.60℃;most of SBC18 formed intramolecular hydrogen bonds companied withzwitterion form and phase transition was lower ca.48℃ while at surface pressurehigher than the turnover(≥45mN/m),which is caused by the different interchaininteraction arising from various hydrogen bonds for SBC18 LB film deposited atdifferent surface pressures.

低于相应π-A等温线转折(5～30mN/m)时，以分子间氢键为主，头基主要以醌式构型存在，相变温度较高(≈60℃)；高于转折(≥40mN/m)时，以分子内氢键为主，头基主要以双性离子构型存在，相变温度较低(≈48℃)。

Stable Vitamin K 3 is synthesized by addition reaction of raw materials of niacinamide, chlorhydric acid and menadione sodium bisulfite at 25℃.

以烟酰胺、盐酸为原料，在 2 5℃反应得烟酰胺盐酸盐溶液，而后与亚硫酸氢钠甲萘醌发生加成反应，反应的物料配比为：n ∶ n ∶ n =1∶1。

Chicken, Chicken Meal, Whole Ground Brown Rice, Whole Ground Barley, Chicken Liver, Pea Fiber, Chicken Fat (Preserved with Natural Mixed Tocopherols and Citric Acid), Brewers Dried Yeast, Natural Chicken Flavor, Dried Egg Product, Oil Blend (Soybean oil, Olive Oil, Salmon Oil, Evening Primrose Oil; Preserved with Natural Mixed Tocopherols and Citric Acid), Pumpkin, Apples, Sweet Potatoes, Carrots, Spinach, Blueberries, Dried Cranberries, Clams, Whole Ground Flaxseed, Calcium Carbonate, Salt, Potassium Chloride, Taurine, Green Lipped Mussels, Dried Chicory Root Extract, Yucca schidigera extract, Grape Seed Extract, Dried Kelp, L-Ascorbyl-2-Polyphosphate, Glucosamine Hydrochloride, Chondroitin Sulfate, Vitamin E Supplement, Ferrous Sulfate, DL-Methionine, Zinc Proteinate, Zinc Oxide, Manganese Proteinate, Niacin, Copper Proteinate, Folic Acid, Vitamin B12 Supplement, Copper Sulfate, Manganous Oxide, Vitamin A Supplement, Sodium Selenite, Thiamine Mononitrat Calcium Pantothenate, Riboflavin, Pyridoxine Hydrochloride, Biotin, Vitamin D3 Supplement, Menadione Sodium Bisulfite Complex, Calcium Iodate, Dried Lactobacillus acidophilus Fermentation Solubles, Dried Lactobacillus lactis Fermentation Solubles, Dried lactobacillus casei Fermentation Solubles, Rosemary Extract.

创造了一种全新的生产模式：低温焗炉焗制，低温焗烤不仅保存了食物中的营养和矿物质，而且降低了油份，让您的宠物食得更健康。更值得一提的是，通过数年投入大量人力、财力经过不断的尝试，终于于2009年年初研制出适合猫咪的最好食粮，无论从口感、成分配比，营养分析等综合因素，是您可以选择的最好的食材。鸡肉，鸡肉粉，全糙米，全地面大麦，鸡肝，豌豆纤维，鸡脂肪（天然保存溷合生育酚和柠檬酸），干酵母，天然鸡肉香精，干蛋产品，溷合油（豆油，橄榄油，三文鱼油，月见草油，天然溷合生育酚和柠檬酸保存），南瓜，苹果，红薯，胡萝卜，菠菜，蓝莓，小红莓干，蛤，全亚麻籽，碳酸钙，盐，氯化钾，牛磺酸，绿唇贻贝，干菊苣根提取物，丝兰提取物，葡萄籽提取物，干海带，L -抗坏血酸- 2 -聚，氨基葡萄糖盐酸盐，硫酸软骨素，维生素E补充，硫酸亚铁，DL -蛋氨酸，锌蛋白盐，氧化锌，锰蛋白盐，烟酸，铜蛋白盐，叶酸，维生素B12，硫酸铜，氧化锰，维生素A补充剂，亚硒酸钠，硫胺Mononitrat泛酸钙，核黄素，盐酸吡哆醇，生物素，维生素D3的补充，亚硫酸氢钠甲萘醌复合，碘酸钙，干嗜酸乳杆菌发酵米糠，干乳酸乳杆菌萃取物，干乳杆菌萃取物，迷迭香提取物。

With the increase of the TiO〓 content, the H-bonding interaction was strengthened and the characteristic peaks of benzoid, quinoid were shifted. FTIR, Uv-vis, XPS show that the interaction between polyaniline and nanocrstalline is strong.

随着TiO〓粒子含量增加，氢键作用加强，聚苯胺的苯环、醌环等特征吸收峰发生一定程度的偏移。

In this paper, the effect of modifying procedure of the GC electrode on the electrode reaction kinetics of benzoquinone and the modified mechanism of enzyme electrode havebeen studied.

玻碳电极经电化学氧化处理，可提高苯醒电子中继物电极反应的可逆性，其原因在于电极表面氧化生成的羧基与醌基之间形成氢键，提高了电极表面电子冲继物的浓度，降低了异相电荷传递的活化

The present doctoral dissertation was carried out to study the chemical constituents isolated from stems of two medicinal schisandraceous plants.34 compounds were isolated from the ethanol extracts of the stems S.henryi collected in the Jiangxi province by various column chromatographies.27 of them were identified on the basis of spectral analysis.There are 18 lignans,(including 5 dibenzocyclooctadienes,6 aryltetralins,2 tetrahydrofurans,3 diarylbutanes,2 other lignans),3 flavanols,2 glyceroesters,1 naphthoquinone,1 xanthine and 2 steroids,of which 6 compounds were new compounds,and 7 compounds were isolated from this family for the first time.

采用多种色谱技术进行分离纯化，从翼梗五味子藤茎的乙醇提取物中分离到34个化合物，综合运用现代波谱学技术鉴定了27个化合物，包括木脂素类化合物18个(其中联苯环辛烯类木脂素5个，芳基四氢萘类木脂素6个，四氢呋喃类木脂素2个，二芳基丁烷类3个，其他类型木脂素2个)，黄烷醇类化合物3个，甘油酯类化合物2个，萘醌类化合物1个，黄嘌呤类化合物1个，甾体类化合物2个，其中，5个为新化合物，7个为本科首次报道。

METHODS Chlorodehydromethyltestosterone was synthesized from methyltestosterone by cycloxidization with hydrogen peroxide to obtain cycloproxene methyltestosterone, which subjected to chloridization with was hydrochloric acid in the presence of propanone to obtain chloromethyltestosterone, and then was subjected to dehydrogenation with DDQ using PTS as dehydrogenation catalyst in benzene.

以甲睾酮和H2O2环氧化反应得到环氧甲睾酮，再与盐酸在丙酮溶媒中进行氯化反应，得到氯甲睾酮，最后用2，3-二氯－5，6-二氰基对苯醌在PTS催化下脱氢得到脱氢氯甲睾酮。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。