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methyl    音标拼音: [m'ɛθəl]
n. 甲基,木精

甲基,木精

methyl
n 1: the univalent radical CH3- derived from methane [synonym:
{methyl}, {methyl group}, {methyl radical}]

Methyl \Meth"yl\, n. [See {Methylene}.] (Chem.)
A univalent hydrocarbon radical, {CH3-}, not existing alone
but regarded as an essential residue of methane, and
appearing as a component part of many derivatives; as, methyl
alcohol, methyl ether, methyl amine, etc. [Formerly written
also {methule}, {methyle}, etc.]
[1913 Webster]

{Methyl alcohol} (Chem.), a light, volatile, inflammable
liquid, {CH3.OH}, obtained by the distillation of wood,
and hence called {wood alcohol} or {wood spirit};
tecnically referred to as {methanol}; -- called also
{methol}, {carbinol}, etc.

{Methyl amine} (Chem.), a colorless, inflammable, alkaline
gas, {CH3.NH2}, having an ammoniacal, fishy odor. It is
produced artificially, and also occurs naturally in
herring brine and other fishy products. It is regarded as
ammonia in which a third of its hydrogen is replaced by
methyl, and is a type of the class of substituted
ammonias.

{Methyl ether} (Chem.), a light, volatile ether {CH3.O.CH3},
obtained by the etherification of methyl alcohol; --
called also {methyl oxide} or {dimethyl ether}.

{Methyl green}. (Chem.) See under {Green}, n.

{Methyl orange}. (Chem.) See {Helianthin}.

{Methyl violet} (Chem.), an artificial dye, consisting of
certain methyl halogen derivatives of rosaniline.
[1913 Webster]


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  • Proton NMR Spectroscopy
    Proton nuclear magnetic resonance Click on the link on the icon below to view a video introducing NMR spectroscopy How are spectra created? Nuclei behave like tiny magnets – similar to a compass needle The compass needle aligns with the Earth’s magnetic field and points north When energy is put in, the needle can be made to align in a direction opposite to the Earth’s magnetic field
  • NMR Spectroscopy
    One methylene and one methyl are closer to the divalent electronegative oxygen, and so their chemical shifts will be further downfield than the chemical shifts of the methylene and methyl that are closer to the carbonyl group (and further from the oxygen) * o-Xylene shows peaks in the upfield region for saturated hydrocarbons and in the region
  • PowerPoint Presentation
    The 3 identical methyl groups are bonded to a central carbon that has 0 hydrogens attached therefore is a singlet and therefore no additional info to what we already have
  • PowerPoint Presentation
    The onset of methyl groups rotation at temperatures below Tg is clearly seen PI-h8, PI-d8 with all H substituted by D PI – d3 PI – d5 PI-d3 PI-d5 Collective Vibrations, The Boson Peak The low-frequency, so-called boson peak (the name came from trivial Bose-statistics) has been observed in light and neutron scattering spectra of all glass
  • PowerPoint Presentation
    TMS JCH = 118 Hz JCH = 151 Hz JCH = 126 Hz 13C Spectrum of Methyl Salicylate (Broadband Decoupled) 13C Spectrum of Methyl p-Hydroxybenzoate (Broadband Decoupled) The 13C Spectrum of Camphor The End F E Ziegler, 2004 * * * * * * * * * * * * * * * * * * * * * * * Atomic nuclei in The absence of a magnetic field Bo Atomic nuclei in the presence
  • PowerPoint Presentation
    Methyl red–Voges-Proskauer test on Enterobacter aerogenes FIG 9 A methyl red–Voges-Proskauer (MR-VP) test done on Enterobacter aerogenes The image depicts the results after a 48-hour incubation at 37°C Tube A shows a negative result for the methyl red test indicated by the lack of color change after the addition of methyl red reagent
  • PowerPoint Presentation
    Note that hexane has 2 identical methyl groups; 2 identical methylene groups adjacent to the methyl groups; and 2 identical methylene groups in the middle of the molecule 2nd: Look at the chemical shift chart on a previous slide All the peaks in this spectrum are in the upfield area expected for saturated carbons (0-40 ppm)
  • PowerPoint Presentation
    Methyl STEP 2 Change butanoic acid (butyric acid) to butanoate (butyrate) Methyl butanoate (methyl butyrate) B STEP 1 Write the carbon chain from the alcohol as alkyl
  • PowerPoint Presentation
    CH (methine group) methyl group: 1° hydrogens methylene group: 2° hydrogens methine group: 3° hydrogens * 2 16: Sources of Alkanes and Cycloalkanes (please read) 2 17: Physical Properties of Alkanes and Cycloalkanes Non-nonbonding intermolecular attractive forces (van der Waals forces) Dipole – Dipole 2
  • Chapter 22 Alpha Substitution and Condensations of Enols and Enolate Ions
    Chapter 22 * Positive Iodoform Test for Alcohols The iodine oxidizes the alcohol to a methyl ketone and it will give a positive iodoform test Iodoform (CHI3) is a yellow solid that will precipitate out of solution Chapter 22 * Propose a mechanism for the reaction of 3-pentanone with sodium hydroxide and bromine to give 2-bromo-3-pentanone





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