After esterification, the ethyl-2-chloro-3-phenylpropionate reacts with diethyl malonate under the catalysis of sodium ethylate, and we obtain the corresponding triethyl ester. The-benzylsuccinic acid is formed by the triethyl ester reacting with concentrate hydrochloric acid and taking place hydrolyzation and decarboxylation reaction at the same time. In order to avoid the formation of cinnamic acid, the sodium ethylate and diethyl malonate must be react sufficiently. The course has simple operation, inexpensive materials and better yield.

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Major procurement of goods: a three-chlorosilanes, dichloromethane, AE activity ester, 3-iodine Silane, special acid, pentyl chloride, triethylamine, thiadiazole, tetrazolylazo acid, 2 - Acetamide, tetrahydrofuran, the four-guanidine, isopropanol, five phosphorus trichloride, sodium vary bitter, acid, sodium phenylacetate, 6-2 silicon n-amine, Ethylacetoacetate , Methyl isobutyl ketone, potassium dihydrogen phosphate, aluminium oxide, DL methionine, N, N-dimethylaniline, NN-diethyl aniline, 4 sodium EDTA, Anhydrous sodium sulfate, ammonium sulfate, potassium sulfate, sodium acetate, sodium carbonate, DMC, formic acid, sodium chloride medicinal, oxalate, protopine, acetone, alcohol, acetic acid, vinegar Ethyl, butyl acetate, methanol, ethanol (anhydrous, industrial, medicinal), formaldehyde, Ye Jian (30%), hydrochloride (industrial-grade, refined grade, reagent level), sulfate (98%), Ammonia, calcium carbonate, chlorine dioxide, 6 - APA ,7-ACA ,7-ADCA ,7-ANCA, sulbactam, ceftazidime activity ester, Deng salt (hydroxymethyl-K, acid precursors Potassium, sodium dihydrogen methyl), resin, the enzyme, water treatment agent, Xiao Mo agent, demulsifier, flocculants, activated carbon, all kinds of medicinal materials, All kinds of additives

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METHODS: Compound azelaic acid cream was prepared with vitamin E and azelaic acid as principal agents;the content of vitamin E was determined by HPLC while the contents of azelaic acid and vitamin C were determined by volumetry.

目的：制備復(fù)方壬二酸乳膏并建立其質(zhì)量控制方法。相關(guān)：癸二酸二辛酯国产精品第99页在线观看看，癸二酸二（2-乙已基）酯已二酯二辛酯伊人一本精品久久久久，已二酸二（2-乙已基）酯鄰苯二酸二辛酯，鄰苯二酯二（2-乙已基）酯已二酸二異辛酯

Water,butylene glycol,cyclomethicone,VP/VA copolymer,glyceryl stearate,glycerin,ppg-15 stearyl ether,titanium dioxide,propylene glycol,cetyl alcohol,citrus aurantium dulcisfruit extract,saccharide isomerate,biosaccharide gum-1,ethoxydiglycol,peg-40 stearate,glycyrrhiza glabraroot extract,morus bombycis root extract,potassium cetyl phosphate,phenoxyethanol,c12-20 acid peg-8 ester,triethanolamine,prunus amygdalus dulcis oil,carbomer,caprylyl glycol,caffeine,disodium edta,methylparaben,chondrus crispus,butylparaben,iris germanica root extract,pentadecalactone,sodium polyacrylate,ethylparaben,sodium hyaluronate,peg-8,propylparaben,citric acid,chlorhexidine digluconate,tocopherol,ascorbyl palmitate,ascorbic acid

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Reaction of 9-bromofluorenewith diethyl malonate and sodium carbonate gives diethyl 2-(9-Fluorenyl)malonate.Aminolysis of diethyl 2-(9-Fluorenyl)malonate in ethylenediamine and propylene diamine give〓 and 〓, respectively.〓 and 〓 were synthesized by the reaction of 9-bromofluorene with oxalyl bisethylenediamine. Copper and nickel complexes of 〓 and 〓 were obtained by the reaction of 〓 and 〓 with copper and nickel salt, respectively, in aqueoussolution and extrusion of two hydrogen ions from the amide groups.

使9-溴芴與丙二酸二乙酯在無(wú)水碳酸鈉存在下反應(yīng)合成出2-(9-芴基)丙二酸二乙酯美女黄毛A片免费观看。2-(9-芴基)丙二酸二乙酯在乙二胺中胺解得到配體〓国产另类自拍，2-(9-芴基)丙二酸二乙酯在1，2-丙二胺中胺解得到配體〓国产爱福利一区，使9-溴芴與草酰二乙二胺作用得到配體〓和〓與相應(yīng)的金屬鹽作用分別得到它們的銅男人干男人的黄色视频、鎳配合物。

The present invention provides an improved method of producing polyester by the polycondensation of polyester forming reactants wherein the improvement comprises utilizing, as the polycondensation catalyst, lithium titanyl oxalate.

本發(fā)明提供了一種由制備聚酯用反應(yīng)物的縮聚反應(yīng)制備聚酯的改進(jìn)方法国产精品看片，其中的改進(jìn)包括使用鈦氧基乙二酸鋰作為縮聚反應(yīng)催化劑色欲aⅴ4无码。

LiBOB was synthesized by an improved solid-state method. H2C2O42H2O was dehydrated to get anhydrous H2C2O4, and H2C2O42H2O was mortared with LiOHH2O. The mixture of H2C2O4 and LiOHH2O was preheated at 60 ℃ for 2 h before adding H3BO3 in several times to be mortared. In vacuum dryer, the mixture of the three starting materials was preheated in two steps: at 70 ℃ for 6 h and then at 100 ℃ for 3 h.

用改進(jìn)的固相法合成一種新型電解質(zhì)鋰鹽－雙乙二酸硼酸鋰：首先將脫去結(jié)晶水的H2C2O4與LiOHH2O研磨混勻，在60 ℃預(yù)熱2 h后分批加入H3BO3美女黄色片在线免费观看，然后131美女爱做视频午夜电影，于真空條件下在70 ℃和100 ℃分別保溫6 h和3 h，得到LiBOB粗產(chǎn)品性欧美XXXX一XXXX极品。

LiBOB was synthesized by an improved solid-state method. H2C2O4·2H2O was dehydrated to get anhydrous H2C2O4, and H2C2O4·2H2O was mortared with LiOH·H2O. The mixture of H2C2O4 and LiOH·H2O was preheated at 60 ℃ for 2 h before adding H3BO3 in several times to be mortared. In vacuum dryer, the mixture of the three starting materials was preheated in two steps: at 70 ℃ for 6 h and then at 100 ℃ for 3 h.

摘 要：用改進(jìn)的固相法合成一種新型電解質(zhì)鋰鹽——雙乙二酸硼酸鋰：首先將脫去結(jié)晶水的H2C2O4與LiOH·H2O研磨混勻一级黄久久，在60 ℃預(yù)熱2 h后分批加入H3BO3，然后黄色91在线国产，于真空條件下在70 ℃和100 ℃分別保溫6 h和3 h全免费午夜一级毛片爽爽爽爽，得到LiBOB粗產(chǎn)品。

It was proved that the sensitivity of analytes could be significantly enhanced by adding small amounts of oxalic acid medium with adjusted nebulizer flow-rate gas, especially for the dements with ionization potential between 9 and 11 eV.

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