a38. What was the cause of these erosion problems? 38. 什么是这些侵蚀问题的起因? [translate] ais you 是您 [translate] awhen the sickness heal 当憔悴愈合 [translate] asuitcases 手提箱 [translate] amethyl and methylene groups 甲基和次甲基小组 [translate] ...
Introduction to Infrared and Raman Spectroscopy (Second Edition)N.B. Colthup, L.H. Daly, S.E. Wiberley, Methyl and, in: Methyl and Methylene Groups (Ed.), Introduction to Infrared and Raman Spectroscopy. Academic Press, San Diego, 1990, pp. 215-233....
It is found that there exists a linear relation between the ratio of absorptivity of IR in 1460 cm-1 band to that in 1380 cm- 1 band and the ratio of methylene to methyl groups in the mixtures. 用傅立叶变换红外光谱法表征了取代多环芳烃与正构烷烃混合物,研究发现其亚甲基和甲基比值与14...
Related to methyl group:methylene group ThesaurusAntonymsRelated WordsSynonymsLegend: Switch tonew thesaurus Noun1.methyl group- the univalent radical CH3- derived from methane methyl,methyl radical alkyl,alkyl group,alkyl radical- any of a series of univalent groups of the general formula CnH2n+1...
The term "methyl" was introduced around 1840 by French chemists Eugene Peligot and Jean-Baptiste Dumas from back formation of methylene. Methylene, in turn, was named from the Greek wordsmethy, meaning "wine," andhyle, for "wood or patch of trees." Methyl alcohol roughly translates as "alc...
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[...]regard to the following specific compounds: trichloromethane (chloroform); dichloromethane (methylene chloride); carbon tetrachloride; 1,2-dichloroethane; 1,1,1-trichloroethane; trichloroethylene; tetrachloroethylene; 1,1,2-trichloro-1,2,2-trifluorethane (Freon 113); chlorobenzene; benzene; xylene...
Synthesis and biological activity of a new progestogen, 16-methylene-17α-hydroxy-18-methyl-19-norpregn-4-ene-3,20-dione acetate The progestational activity of second- and third-generation progestins in oral contraceptives were markedly increased by addition of an 18-methyl group. A ... Z Tu...
A methyl group is a fragment consisting of one carbon atom bonded to three hydrogen atoms, and it can act as a donor of methyl groups in certain chemical reactions. AI generated definition based on: The Practice of Medicinal Chemistry (Second Edition), 2003 ...
R4 and R5 are hydrogen, aryl, alkyl or aralkyl or when taken together represent a methylene group and X is halogen, preferably chloro or bromo. It has been found that although the starting materials (formula I) can be those wherein R and R1 are alkyl, aryl or aralkyl, it is ...