tert-butoxide 叔丁醇(28)   叔丁醇     New Synthesis Technology of Sodium tert-Butoxide     叔丁醇钠合成新工艺 短句来源     Ethidene was introduced at the position of C17 of DHEA by Wittig reaction to getsteroid D. When potassium tert-butoxide was used as alkali, the reaction reached theyield of 95.0%; sodium hydride being as alkali and the yield 66.0%.     以DHEA为原料,通过Wittig反应在脱氢异雄酮(DHEA)17位上引入亚乙基得到甾体D,其中以叔丁醇钾为碱,收率95.0%,以氢化钠为碱,收率66.0%。 短句来源     In the experiment,sodium amide, sodium triphenyl methane, and sodium tert-butoxide are selected as catalyst for synthesis of instead 2-cyano-2-(p-nitro phenyl)ethyl acetate to displace the high dangerous catalyst sodium hydride.     实验选用氨基钠、三苯甲醇钠和叔丁醇钠作催化剂 ,以代替高危险性的催化剂氢化钠来合成 2 -氰基 - 2 -对硝基苯基乙酸乙酯。 短句来源     5 - Ethynyl - 4 - methyl - 2 - sulfomethyl- pyrimidine was prepared using potassium tert - butoxide as catalyst to obtain 68% yield at room temperature.     使用新制的叔丁醇钾作为催化剂制备5-乙炔基-4-甲基-2-硫甲基嘧啶,在室温条件下获得了68％产率。 短句来源     Three compounds of 2-fluoro-4-(trans-4-alkylcyclohexyl)phenylboronic acid were synthesized using 1-(trans-4-alkylcyclohexyl)-3-fluorobenzene,n-butyllithium,tributyl borate,and potassium tert-butoxide as reactants,their yields were 52%～56%,and their structures were confirmed by IR and ~1HNMR.     以1-(反式-4-烷基环己基)-3-氟苯与丁基锂、硼酸三丁酯、叔丁醇钾为反应物合成了2-氟-4-(反式-4-烷基环己基)苯基硼酸化合物3个,总收率为52%~56%,分别用IR,1HNMR对其结构进行了鉴定。 短句来源 更多          “tert-butoxide”译为未确定词的双语例句     4,12-dibromo[2,2]paracyclophane is allowed to react with benzophenone imine in sodium tert-butoxide base and Pd-DPPFcatalyst to produce 4-benzophnoni mine- 12-bromo[2,2]paracyclophane     4-二苯甲酮亚胺-12-溴-[2，2]环仿在酸性条件下水解为4-氨基-12-溴-[2，2]环仿。 用左旋樟脑磺酸与胺成盐进行拆分得到(-)-4-氨基-12-溴-[2，2]环仿和(+)-4-氨基-12-溴-[2，2]环仿。 短句来源     The key intermediate for the synthesis was 2-O acetyl-3, 4-di-O-benzyl 6-deoxy-a-L-talopyra nosyl chloride, which was converted into the target compound by ring closure with potassium tert-butoxide.     首先合成(?) 脱氧塔罗糖的衍生物(5),再经过一系列反应得到2-O-乙酸基-3,4-(?) 短句来源     The condensation reactions of α,α-diacetyl ketene dithioacetals with arylaldehydes catalyzed by sodium tert-butoxide were performed. These reactions were affected by the alkylthio groups.     在碱性条件下 ,α,α-二乙酰基二硫缩烯酮和芳醛的缩合反应受烷硫基的影响 . 短句来源 查询“tert-butoxide”译词为用户自定义的双语例句     我想查看译文中含有：的双语例句 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。   tert-butoxide Crucial for the success of the C-N bond forming reaction is the use of potassium tert-butoxide as base and reaction temperatures >amp;gt; 120°C. 例句来源       Infrared absorption spectra and the structure of lithium tert-butoxide in electron-donor solvents 例句来源       Regioselectivity of reductive debromination of substituted pentabromobenzenes with sodium tert-butoxide in DMSO 例句来源       A system aluminum (and titanium) tert-butoxide-tert-butyl hydroperoxide (1 : 2) under mild conditions (20 °C, 1 h) oxidizes aliphatic and alkylaromatic sulfides and diphenyl sulfide to the corresponding sulfones in yields close to ～100%. 例句来源       Liquid-phase oxidation of sulfides by an aluminum (and titanium) tert-butoxide-tert-butyl hydroperoxide system 例句来源       更多                    The title compound was synthesized from L-rhamnose by a series of steps. The key intermediate for the synthesis was 2-O acetyl-3, 4-di-O-benzyl 6-deoxy-a-L-talopyra nosyl chloride, which was converted into the target compound by ring closure with potassium tert-butoxide. The 1H NMR spectrum of the anhydro sugar was determined by the use of single frequency decoupling. The new compounds obtained in the synthesis were identified by their 1H NMR spectra,elemental analysis,mass spectra and optical r...             以L-鼠李糖为原料.首先合成(?)脱氧塔罗糖的衍生物(5),再经过一系列反应得到2-O-乙酸基-3,4-(?)-O-(?)基-6-脱氧-α-L-塔罗吡喃糖氯代物(9),在叔丁醇钾的作用下,化合物9很容易关环得到最终产物1,2-内醚糖. 文摘来源          Methyl (3,5 di tert butyl 4 hydroxyphenyl) propionate,an intermediate for the preparation of tetrakis [3 (3,5 di t butyl 4 hydroxyphenyl) propionyloxymethyl] methane by one step method,was synthesized with 2,6 di tert buty phenol and methyl acrylate in the presence of potassium tert butoxide in a 15 liter stainless batch tank reactor.The optimum technological conditions were determined and excellent yield and selectivity w...             在１５升的不锈钢反应釜中以２，６－二叔丁基苯酚、丙烯酸甲酯为原料，在叔丁醇钾催化剂存在下，对一步法合成抗氧剂１０１０的中间体３，５－二叔丁基－４羟基苯丙酸甲酯的工艺条件进行了研究，优化了反应条件。结果表明，在较佳的条件下，反应的选择性及收率分别超过９８％、９５％。 文摘来源          The reaction of producing potassium tert butoxide from potash and tert butyl alcohol is an intensive reversible reaction.Because the reaction equilibrium favors the formation of alcohol,potassium tert butoxide can not be obtained without removing the water formed during the reaction.So a technology integrating azeotropic reaction distillation in boundary film and a packed column having large surface area is applied.The ...             采用在界面上将反应和共沸精馏结合为一体的工艺和具有大比表面积的填料塔，获得了强可逆反应的目的产物。将该工艺和设备应用于由氢氧化钾制取叔丁醇钾的反应，小试和放大试验研究表明，氢氧化钾的转化率达到９３％以上。它比传统金属钾制取叔丁醇钾有明显的技术、经济、安全优势。 文摘来源   << 更多相关文摘         相关查询:  对查询结果不满意

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