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first synthesis
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  首次合成
    The first synthesis of ethyl (+)-(2R,3S,4S,5S)-4,5-epoxy-2,3-dihydroxy-6-methyl heptanoate (5) and ethyl (-)-(2R,3S,4R,5S)-2,3,4,5-tetrahydroxy-6-methyl heptanoate (11) was achieved and the key steps involved the construction of chiral carbon centers by the asymmetric epoxidation and dihydroxylation.
    以不对称环氧化和双羟化反应为构筑手性碳的关键步骤,首次合成了(+)-(2R,3S,4S,5S)-6-甲基-4,5-环氧-2,3-二羟基-庚酸乙酯(5)和(-)-(2R,3S,4R,5S)-6-甲基-2,3,4,5-四羟基-庚酸乙酯(11).
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    First Synthesis of Three Naturally Occurring O-Prenylated Phenylpropanoids
    三种O-异戊烯基苯丙素类天然产物的首次合成
短句来源
    The first synthesis of three naturally occurring phenylpropanoids, boropinol A (1), boropinal C (2) and boropinic acid (3), is described. The reaction of vaniline (4) with prenyl bromide in DMF gave the O prenylated product 5 in 84% yield. Condensation of 5 with Ph 3PCHCO 2Et in DME produced ester 6 in 52% yield.
    以香草醛为起始原料 ,经O 异戊烯基化、Wittig反应、水解、还原、氧化等反应步骤 ,首次合成了三种苯丙素类天然产物boropinolA (1) ,boropinalC (2 ) ,boropinicacid (3) .
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  “first synthesis”译为未确定词的双语例句
    Ultrasound was used during the first synthesis reaction, i.e. reflux reaction, inBPT synthesis process.
    使用超声辐射作用于合成 BPT 的第一步回流反应。
短句来源
    The research result about an influence of ultrasound is the same as theresult of the experiment in first synthesis reaction.
    通过对有无超声辐射下的实验结果对比发现,超声对本反应的促进作用主要表现在对传质过程的强化、促进作用。
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    By analyzing the possible synthetic routes of hexanitrohexaazaisowurtzitane(HNIW), it′s concluded that a threestep strategy is practical, i.e.,the first,synthesis of benzylderivative of hexaazaisowurtzitane,then,transformation of the N-benzyl substituents into intermediate with N-carboxyl groups and at last,nitration of the intermediate.
    本文分析了六硝基六氮杂异伍兹烷的合成途径,认为以六氮杂异伍兹烷的衍生物作合成前体,分三步走的路线(即六氮杂异伍兹烷的苄基衍生物的合成,将六氮杂异伍兹烷N苄基转化为N羧基衍生物和该转化物的硝化)是现实的。
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    A new synthesis method-at polymer synthesis of 15-crown ester-5 by studied in this paper. The first synthesis was addition reaction of polystyrene allyloxtmethylate with tetraethylene glycol and NBS. The second synthesis was cyclization of the first synthetic product.
    本研究给出高分子冠醚化合物的一种新合成方法———用烯丙氧基化的聚苯乙烯作为合成冠醚的前体,在NBS存在下与三缩四乙二醇加成,然后关环生成聚合物支载的15-冠-5。
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  first synthesis
First synthesis of an optically active derivative of 3-selenabicyclo[3.3.1]nonane
      
The first synthesis of 4-oxo-6-(trifluoromethyl)-4H-pyran-2-carboxylic acid a
      
The first synthesis of a conjugate of the dodecaborate anion with
      
First synthesis of α-aminophosphonates from natural porphyrin derivatives by the Kabachnik-Fields reaction
      
First synthesis of dialkyl phosphonate derivatives of sesquiterpene α-methylene-γ-lactone
      
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It is reported that N ethylaniline could be efficiently synthesized from aniline and ethanol in the presence of Raney Ni, and N benzyl N ethyl aniline could be conveniently prepared from N ethylaniline and benzyl chloride with the phase transfer catalyst. The yield of the first synthesis is about 30% more than that reported in the classical method.

报道了以丁二酮和乙二胺为原料,对液相合成2,3-二甲基吡嗪的方法进行了改进。考察了反应温度、溶剂用量和脱氢剂等对反应的影响,确定了合成2,3-二甲基吡嗪的优化条件为:丁二酮∶乙二胺(摩尔比)=1∶1.05;丁二酮∶溶剂无水乙醇(体积比)=1∶10;缩合反应温度:-5℃,时间:1h;脱氢剂:DHKM-12,脱氢温度:80~85℃,时间:1h。2,3-二甲基吡嗪的产率按投料丁二酮计达65%。

The present work reported first synthesis, characterization, catalytic properties, electronic structure and the results of theoretics ab initio calculations of a novel PPGEC. The corelative theoretics calculations and analysis for PPGEC were procured nsing ab initio method like GAUSSIAN-92 program modified and accelerated by the present researching group. PPGEC was successively synthesized applying an one-step in situ electrochemical syntheqing method. PPGEC is determined as (C 4H 3N) 2(Ge(OH)(O ...

The present work reported first synthesis, characterization, catalytic properties, electronic structure and the results of theoretics ab initio calculations of a novel PPGEC. The corelative theoretics calculations and analysis for PPGEC were procured nsing ab initio method like GAUSSIAN-92 program modified and accelerated by the present researching group. PPGEC was successively synthesized applying an one-step in situ electrochemical syntheqing method. PPGEC is determined as (C 4H 3N) 2(Ge(OH)(O 2)Cl 3 species through automainic EA, UV, IR, SEM, ESCA, XRS and ddDTA ttc. measurements. From these to obtain the most stable structure. Theoly is very in agreement with experiments.

新型锗系聚吡咯分子簇络合物的合成、表征及其电子结构的从头算研究刘尚长金旭东闫丽静刘宁徽宋玉林(辽宁大学化学系,沈阳110036)关键词锗配合物;聚吡咯;分子簇配合物;从头算;Gaossion程序.锗及其化合物在半导体、超导体、医药、医疗、保健、化学、...

The first synthesis of A-zeolite with round shape and micro size(1 μm) from the coal industry waste through the solid-phase synthesis approach is introduced and the condition and mechanism of the reaction are discussed in this paper,in which the experimental proof for the solid-phase transforming mechanism in the synthesis of low-silicate zeoliet and the data for the comprehensive treatment and utilization of the large amount of the industrial waste-coal gangue are presented.

首次以煤基工业废料为原料用固相法 (H2 O和Na2 O的摩尔比低于 0 9)合成了具有圆形晶粒形貌的小晶粒 (1μm)A型沸石分子筛 ,其各项质量指标符合行业标准。并对合成的条件及机理进行讨论 ,提供了固相转化机理在低硅类沸石合成领域的实验佐证 ,并为大宗煤工业废渣的综合治理及深层次开发利用提供基础性数据

 
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