25.1、L1、L5、L7[2015·北京卷] “张烯炔环异构化反应”被《Name Reactions》收录。该反应可高效构筑五元环状化合物:0-|||-R-C-|||-=-|||-K-c=-G-|||-BC--|||-:-|||-0一-时(R、R′、R″表示氢、烷基或芳基)合成五元环有机化合物J的路线如下:B-|||-CB.-|||-CELD-|||-愁国-...
This document is part of Subvolume C 'Organic crystals, liquid crystals and polymers' of Volume 36 'Ferroelectrics and Related Substances' of Landolt-B?rnstein - Group III 'Condensed Matter'. It contains the following properties of the antiferroelectric liquid crystals MHPOBC and analogues, L-...
Name:sec-Butyl Acetate,CAS:105-46-4.Molecular Fomula:C6H12O2,Molar Mass:116.16,Density:0.872g/mLat 25°C(lit.),Melting Point:−99°C(lit.),Boling Point:111-112°C(lit.),Flashing Point:61°F,Solubility:3 g/100 mL (20 ºC),Vapor Presure:11.0 at 25 °C
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有机物甲、乙的结构简式分别是?xml:namespace>甲:CH3COOCH2CH2OOCCH3乙:C2H5OOCCOOC2H5(1)甲和乙的关系是___A.同一物质 B.同分异构体 C.同系物(2)它们可用有机物X、氧气、乙醇、乙酸等试剂作反应物,在一定条件下合成。请完成下列问题:①有机物X的结构简式是___.②写出从X合成甲、乙这两种有机物...
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在Excel 2016中输入的公式有错误时,系统会提示相应的出错信息,其中 “#NAME?” 表示公式中 () A. 无效的地址引用 B. 非法的数值 C. 不能识别的文本 D. 不正确的参数或运算符 查看完整题目与答案 简化问题可以是( )。 A. 突破传统观念 B. 向概念和主导观念挑战 C. 思维不变 D. 结果错误...