查询词典 reaction ring

A novel isomer of furazano energetic compound 3,4-diaminofurazanofuroxan was synthesized by the dimeric ring-close reaction of transitional intermediate 3-amino-4-cyanofurazan oxide after the energetic compound 3-amino-4-chloroximinofurazan was treated with diluent alkali at low temperature, The yield of DAFF isomer could be over 66.3% and its single crystal was cultivated.

将含能化合物3-氨基－4-氯肟基呋咱在低温下用稀碱处理后发生过渡中间体3-氨基－4-氰基呋咱氧化物的二聚关环反应合成了新型呋咱类含能化合物3，4-二氨基呋咱基氧化呋咱异构体，产率达66.3%。

In addition, we studied the ring-closing metathesis of the diene intermediates to access helicenes by screening a wild reaction condition.

我们还对RCM反应关环得到螺旋化合物的方法进行了研究，筛选得到温和的RCM反应条件。

The reducing-coupling reaction of benzoyl chloride under Dy/n-BuBr was complex. Besides diphenyl diketone, benzoin and ring-opening product of THF were also obtained.

苯甲酰氯在Dy/n-BuBr作用下的还原偶联反应较为复杂，除得到二苯基乙二酮外，还得到四氢呋喃开环产物以及安息香。

The influences of reaction parameters were discussed respectively, such as esterification time and temperature, catalyst dosage, ring-closing temperature, dosages of ECH, NaOH, etc.

重点研究了酯化阶段反应温度、反应时间及催化剂用量等影响因素；闭环阶段反应温度、碱的形态及ECH用量对闭环反应的影响。

A novel rearrangement reaction of enol ester epoxide upon treatment of methoxide was first discovered, which could generate two key essential functions for ring cyclization, C5-OH and 7, 11-double bond in one step.

烯醇酯环氧化物在甲醇钠处理下一步反应派生出两个关环所需的重要官能团：C5-OH和7，11-双键；2。

In the reaction of a-stannyl radical addition to carbonyl to form six-membered ring, we constructed a sulfonyl group at the a position of the formyl group to inhibit 1,5-H shift in order to increase the cyclization product yield. We obtained 41 % yield of the cyclization product in this system.

在 a-锡基自由基加成到醛基形成六员环的系统中，我们在醛基的 a 位上加入碸基来抑制 1，5-氢转移并提升环合产物之产率，在这个系统中，我们得到了 41 %的环合产物。

According to the synthetic methods study of the quinolones, it is found that the synthetic method of parent ring is of wide use by the condensation from α-substituted aryl formyl-β-substituted aminoacrylic acid and the inner molecular nucleophilic substitution reaction, which is almost suitable for the quinolones preparation of different rings or different substituted groups in 〓-position.

然后，对其合成方法进行了归纳，发现：由α-取代芳甲酰基-β-取代氨基丙烯酸缩合，经分子内亲核取代反应形成喹诺酮母环的合成方法用途非常广，几乎适用于所有不同环系或〓-位是不同取代基的喹诺酮类衍生物的制备。

The reaction of an azetidine with chloroformate can give either the dealkylated heterocycle or the ring-opened product.

与氯的反应氮杂环丁能给要么dealkylated杂环或环打开产品。

Difluorodiphenylsulfone and 4, 4"-difluorodiphenylketone are sulfonated by 50 % sulfuric acid. A new biphenol monomer containing six-membered ring imide is synthesized by reaction of 1, 4, 5, 8-naphthelenetetracarboxylic acid dianhydride with 3-aminophenol or 4-aminophenol sodium.

以50%发烟硫酸为磺化试剂，以4，4′-二氟二苯砜和4，4′-二氟二苯酮为原料反应得到双磺化的4，4′-二氟-3，3′-二磺酸钠-1，1′-二苯砜和4，4′-二氟-3，3′-二磺酸钠-1，1′-二苯酮。

The formation of 1,3- and 1,6-DMC resulted from methylation at ring carbon 3 and 6, which have identical reaction activities, in 1-methylcarbazole in kerogen matrix with identical rate. The 1,4- and 1,...

相对于1，3-DMC和1，6-DMC而言，1，4-DMC和1，5-DMC显示出相当一致的变化趋势，表明了在1-甲基咔唑进一步的甲基化中，3、6与4、5环碳位上存在竞争性反应过程。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。