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- The spiropyrans with a nitro group at the benzopyran moiety showed reverse photochromic behavior, others were normal photochromic compounds. 在苯并吡喃部分含有硝基的螺吡喃显示出逆光致变色行为,其它的则为普通光致变色化合物。
- Nitro compound: Any of a class of chemical compounds in which the nitro group (-NO2) forms part of the molecular structure. 硝基化合物:分子结构中含有硝基(-NO2)的任何一类化合物。
- Nitramines are substances which contain a nitro group bonded to nitrogen. 含有与氮原子相连的硝基的物质称为硝胺。
- Complete transformation of the nitro group to chloropicrin takes place in the reaction. 硝基在反应中完全转变成氯苦。
- Halogenated aromatic nitro - group compounds 卤代芳硝基物
- By Maillard reaction we mean the reaction taking place between amine - group compounds and carboxides. 关拉德反应是指氨基化合物和羰基化合物之间发生的反应。
- Synthesis of triclosan from 2,4 Dichlorophenol and 2,5 Dichloro nitrobenzene usually involves such procedure as etherization,reduction of nitro group,diazotization and hydrolysis. 其合成一般是以2,4二氯苯酚和2,5二氯硝基苯为原料,经过醚化、硝基还原、重氮化、水解等几步反应。
- Methods The product was synthesized from 1-(4-nitrophenyl)piperazine by Boc protection,reduction of nitro group,acylation,hydrazinolysis and cyclization. 方法以1-(4-硝基苯基)哌嗪为起始原料,经Boc保护、硝基还原、酰化、肼解、环合制得目标化合物。
- The results showed that o-nitro aryl ethers containing nitro group(-NO2)would become unstable in the alkaline medium,and nucleophilic substitution was easy to take... 发现邻硝基苯氧丙酸亲核取代的异常情况,推测可能是分子内邻基参与的亲核取代反应。
- The application of monohydroxy or carboxy group compound to fluoro rubber were analyzed. 对一羟基或羧基化合物在氟橡胶胶料中的应用进行了研究。
- Finally,the carbon nanotubes/epoxy group compound microwave absorbing material was analyzed and its microwave absorbing mechanism was discussed. 最后,本文对碳纳米管/环氧树脂基复合吸波涂层材料进行了研究,探讨了碳纳米管复合吸波涂层材料的吸波机理。
- Donors such as amine and phenolic groups,when positioned ortho to a nitro group,are always involved in intramolecular hydrogen bonding. 在硝基邻位上存在的氢键给体如胺基,酚基时,总与硝基形成分子内氢键。
- The various chemical ways of mutual conversion of amino and nitro groups were reviewed with 60 refercens. 综述了氨基与硝基相互转换的各种化学途径,并对其中的重要方法进行了讨论与评述。参考文献60篇。
- Abstract: Four timing group compounds which are used to prepare functional DIAR couplers are presented,and the physical properties and structures of the compounds are identified by IR,1HNMR,MS and etc. 文摘:制备了四只DIAR成色剂的定时基化合物，通过了红外、核磁、质谱对该化合物的结构及物理性质的测定。
- Applied during hemodialysis, the effect rate were 8.3%, 71.4%, 68.2% respectively in midodrine hydrochloride tablet group compound amino acid group, 50% glucose group. 在透析中出现症状后应用，有效率分别为：盐酸米多君8.;3%25，复方氨基酸71
- Four timing group compounds which are used to prepare functional DIAR couplers are presented,and the physical properties and structures of the compounds are identified by IR,1HNMR,MS and etc. 制备了四只DIAR成色剂的定时基化合物，通过了红外、核磁、质谱对该化合物的结构及物理性质的测定。
- The addition of keto group influences the properties of acrylic resin.When the keto group compound is under 6 percent in polymer solids, the stability of PA is good. 酰胺化合物的用量对苯丙乳液也有较大影响，酰胺化合物在乳液中质量分数小于6%25时，丙烯酸乳液的稳定性最好。
- The addition of keto group influence the properties of acrylic resin.when the keto group compound is under 6 percent in polymer solids,the stability of PA is good. 酰胺化合物的用量对苯丙乳液也有较大影响,酰胺化合物在乳液中质量分数小于6%25时,丙烯酸乳液的稳定性最好。
- Education should not be restricted to any one specific age group. 教育不应限制在任何特定的年龄组上。
- He broke away from that lawless group years ago. 他在几年前脱离了那个非法团体。
