烯酮

In the presence of alkalinity and tetraethyl ammonium bromide, 2,4-dihydroxy benzophenone reacts with allyl glycidyl ether to form an ethylenic derivative of benzophenone, 2-hydroxy-4-(β-hydroxy-γ-allyloxy) propyloxy benzophenone, which can further undergo hydrosilylation with polyhydromethylsiloxane.

在相转移催化剂四乙基溴化按作用下，利用2，4-二羟基二苯甲酮与烯丙基缩水甘油醚在碱性水溶液中的开环加成反应，合成了中间体4-丙氧基－2-羟基二苯甲酮，将其进一步与聚甲基氢硅氧烷进行硅氢化加成反应。

Dihydrojasmone was synthesized from2-hexyl-5-methyl-1,2-oxaborolane,prepared frommethyl vinyl ketone and hexene,via the homologationwith 〓 followed by PCC oxidation and intra-molecular condensation.In stead of the oxidation ofthe C-B bond of 1,2-oxaborolane,fluoride inducedhalogenation of 2-alkoxy-1,2-oxaborolane was found togive 3-halopropanol.

硼氢化甲基乙烯基酮和已烯得到的2-已基-5-甲基-1，2-氧硼杂环戊烷与〓反应，再经PCC氧化，分子内缩合得到二氢茉莉酮。1，2-氧硼杂环戊烷的C-B键除氧化断裂之外，也能够在〓或KF作用下卤化断裂成碳卤键。

A series of 3 - aryl - 3 -( 5,5 - dimethyl - 3 - hydroxy - 2 - cyclohexene - 1 - one - 2 - yl) propanoic ester s were synthesized by reaction between aromatic aldehydes ,5,5- dimethyl -1,3-cyclohexanedione and isopropylidene malonate catalyzed by KF - Al2O3 in alcohols.

在KF-Al_2O_3催化下，将芳香醛3，5-二甲基-1，3-环己二酮及丙二酸亚异丙酯在醇中反应，一锅式合成了一系列的3-芳基-3-(5，5-二甲基-3-羟基-2-环己烯-1-酮-2-基)丙酸酯。

Aromatic constituents of Huangdan Oolong tea were analysed with GC and MS and were compared in different green-making humid conditions.The major aromatic constituents of Huangdan Oolong tea were nerolidol,α-farnesene, linalool and its oxide, geraniol, pheny lacetal dehyde, indole, cis-jasmine lactone β-ionone cis-jasmone, benzyl acetate and so on.At the same temperature,the content of aromatic constituents were different, the aromatic quality in the 75% humid condition was better,which was more fragrant and kept longer.

用GC/MS法分析了黄旦品种乌龙茶的香气组分，并对不同湿度做青环境条件下生产的乌龙茶香气组分进行比较分析表明：黄旦乌龙茶主要香气成分为橙花叔醇、α-法呢烯、芳樟醇及其氧化物、香叶醇、苯乙醛、吲哚、顺-茉莉内酯、β-紫罗酮＋顺-茉莉酮、乙酸苄酯等；在相同温度（23℃），不同湿度做青环境生产的黄旦乌龙茶香气主要特征成分含量和精油总量各不相同，且香气品质以做青环境相对湿度75％为好，香气高且持久。

Some useful fluorine-containing intermedi-ates were synthesized by the reaction of activated methylenecompounds or silyl enol ether with 2,2-dihydropolyfluoro-alkanoates or 2-hydropolyfluoroalk-2-enoates in the presenceof different bases.

进一步研究表明，在氢化钠的作用下，苯乙腈，苄基苯基甲酮也可以与2-氢多氟-2-烯酸乙酯发生亲核加成反应，苄基苯基甲酮的加成中间体经多聚磷酸环化，得到了间位氟烷基取代的α-萘酚衍生物。

Thestercoselectivity of the reaction of propargylide was different completely from that of the reactionof telluronium 3-trimethylsilylalltide with α,β-unsaturaled ketones and trans-trimethysilylacetylenyl-l-benzoyleyelopropane derivatives were obtained.

发现这一反应的立体化学与同样条件下含硅烯丙基碲叶立德和α，β-不饱和酮反应的立体化学完全不同，得到的是又式-2-三甲基硅基乙炔基-1-酮基环丙烷衍生物。

Aiming at the shortcomings of high formaldehyde content and low soaping and crocking fastnesses of currently used pigment printing binder,by60Co-γ radiation polymerization process,the waterborne polyacrylate emulsion containing active keto groups was synthesized from acrylate monomers and diacetone acrylamide.

针对目前所用涂料印花黏合剂存在的色牢度低和甲醛含量高的缺陷，采用钴60-γ辐射法聚合工艺，利用丙烯酸酯单体、双丙酮丙烯酰胺合成出含活性酮羰基的丙烯酸酯乳液；然后同含端酰肼基聚氨酯乳液按一定的比例混合，制备出酮肼交联型丙烯酸酯聚氨酯复合乳液。

The main by-product s and their separation and recovery technologies were discussed for cyclohexanone gas-phase Beckmann rearrangement.

探讨环己酮肟气相Beckmann重排主要副产物及其分离回收方法，研究1-氮杂-2-乙氧基-1-环庚烯、1，3，4，5-四氧吖庚因-2-酮及其同分异十句体等副产物回收利用生成已内酰胺的方法。

The quality of propolis is decided by raw materials, lead-off technology and flavonoid content.

蜂胶的原料、脱铅技术和黄酮类物质的含量共同决定蜂胶产品品质的好坏，而澳洲野生森林保持了独特的物种和最纯净的自然环境，由此孕育的蜜蜂所产出的蜂胶原块含有极丰富的天然生物黄酮物质、萜烯类物质、阿魏酸等在内的数百种珍贵营养成分，既不含农药也不含重金属。

Consequently,in this study we introduced genes that encode the xylose isomerase and xylulokinase precisely under the control of a strong,constitutive glyceraldehydes-3-phosphate promoter by PCR-mediated overlap extension,which is in charge of xylose assimilation;and also we introduced genes that encode the transaldolase and transketolase precisely under the control of enolase promoter,which is in charge of xylose utilization,then transformed plasmid with the two operons into Z.

因此，本文通过代谢工程手段，将负责木糖代谢转化的木糖异构酶基因和木酮糖激酶基因置于强组成型启动子3-P-甘油醛下；同时将负责木糖转化利用的转醛醇酶和转酮醇酶基因置于强组成型启动子烯醇酶下，通过电转的方式将上述四个基因转入到Zymomonasmobilis CP4中，从而在运动发酵单胞菌中构建起一套完整的木糖代谢途径。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。