methiden.

Brit.

/ˈmɛθʌɪd/,

/ˈmiːθʌɪd/, U.S.

/ˈmɛˌθaɪd/

Forms: 1800s methyde, 1800s– methide.

Origin: Formed within English, by derivation. Etymons: methyl n., -ide suffix.

Etymology: < meth- (in methyl n.) + -ide suffix. In sense 2 after German Chinonmethide (K. Hultzsch 1941, in Berichte der Deutsch. Chem. Ges. 74 1533). Compare ethide n.

Chemistry.

1. The methyl anion CH₃⁻, originally spec. in a compound with a metal atom. Later also: any compound that contains this anion or a substituted derivative of it.

ΚΠ

1851 E. Frankland in Q. Jrnl. Chem. Soc. 3 347 Methyde of methyl.

1852 E. Frankland in Philos. Trans. (Royal Soc.) 142 443 Methide of zinc.

1865 Athenæum No. 1944. 131/1 Aluminium ethide, and methide.

1897 T. C. Allbutt et al. Syst. Med. II. 933 Two young men..suffered severely after making mercuric methide.

1913 A. G. Bloxam & S. J. Lewis Bloxam's Chem. (ed. 10) 684 Tin methide, Sn(CH₃)₄, is a saturated alkyl derivative of Sn^iv.

1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) iv. 123 Zinc methyl or methide, Zn(CH₃)₂.., is prepared according to method 1.

1957 Chem. Abstr. 51 Subject Index 1501s/2 Methides, see ‘metal derivs.’ under Methane.

1985 Jrnl. Amer. Chem. Soc. 107 5600 Electron transmission spectroscopy has been employed to determine the energies of low-lying negative ion states of group 15..and group 16 (M = O and S) methides, M(CH₃)_n.

1995 Jrnl. Electrochem. Soc. 142 l116/1 We have previously synthesized the methide anion [sc. tris(trifluoromethylsulfonyl) methide] in the form of Li⁺ and Cs⁺ salts.

2. More fully quinone methide. A quinone derivative with a methylene group in place of one of the oxygen atoms.

ΚΠ

1951 C. A. Redfarn in H. M. Langton Synthetic Resins & Allied Plastics (ed. 3) iii. 136 K. Hultzsch has suggested the theory that when the ether linked compounds are heated above 160°C. they break down to give ortho- and para- quinone methides and their polymers.

1958 N. J. L. Megson Phenolic Resin Chem. iii. 64 The production of quinone methides is of importance to the mechanism of resole formation; but..the methides from para alcohols appear, in general, to form dimers.

1981 Jrnl. Amer. Chem. Soc. 103 5250/2 Described herein are the syntheses of nitrogen-containing polycycles based on this methodology for the generation of N-substituted o-quinone methide imine.

1998 Biochem. Jrnl. 332 367/1 Inactivation proceeds via a quinone methide intermediate formed by the fragmentation of the aglycone of salicortin while it is bound to the enzyme.

3. A carbide whose anion is a single carbon atom (C⁴⁻), and which gives methane on hydrolysis.

ΘΚΠ

the world > matter > chemistry > elements and compounds > metals > specific elements > carbon > [noun] > compounds

carbonic acid1788

carburet1788

carbure1789

carbonic acid snow1841

carbidec1865

carbon dioxide1867

champagne gas1871

carbon dioxide snow1897

methanide1924

methide1965

carbon1977

1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. xvii. 612 Each [C⁴⁻] anion has then associated with it two tetrahedral holes in which cations may be placed. The alkali-metal ions would be too large and numerous for such a methide lattice..while the alkaline-earth ions would be too large.

1994 D. F. Shriver et al. Inorg. Chem. (ed. 2) xi. 490 Carbides such as Be₂C and Al₄C₃ are borderline between saline and metalloid, and the isolated C ion is only formally C⁴⁻. The existence of directional bonding to the C atom in carbides (as distinct from the nondirectional character expected of purely ionic bonding) is indicated by the crystal structures of methides, which are not those expected for the simple packing of spherical ions.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	methide
释义	methiden. Brit. /ˈmɛθʌɪd/, /ˈmiːθʌɪd/, U.S. /ˈmɛˌθaɪd/ Forms: 1800s methyde, 1800s– methide. Origin: Formed within English, by derivation. Etymons: methyl n., -ide suffix. Etymology: < meth- (in methyl n.) + -ide suffix. In sense 2 after German Chinonmethide (K. Hultzsch 1941, in Berichte der Deutsch. Chem. Ges. 74 1533). Compare ethide n. Chemistry. 1. The methyl anion CH₃⁻, originally spec. in a compound with a metal atom. Later also: any compound that contains this anion or a substituted derivative of it. ΚΠ 1851 E. Frankland in Q. Jrnl. Chem. Soc. 3 347 Methyde of methyl. 1852 E. Frankland in Philos. Trans. (Royal Soc.) 142 443 Methide of zinc. 1865 Athenæum No. 1944. 131/1 Aluminium ethide, and methide. 1897 T. C. Allbutt et al. Syst. Med. II. 933 Two young men..suffered severely after making mercuric methide. 1913 A. G. Bloxam & S. J. Lewis Bloxam's Chem. (ed. 10) 684 Tin methide, Sn(CH₃)₄, is a saturated alkyl derivative of Sn^iv. 1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) iv. 123 Zinc methyl or methide, Zn(CH₃)₂.., is prepared according to method 1. 1957 Chem. Abstr. 51 Subject Index 1501s/2 Methides, see ‘metal derivs.’ under Methane. 1985 Jrnl. Amer. Chem. Soc. 107 5600 Electron transmission spectroscopy has been employed to determine the energies of low-lying negative ion states of group 15..and group 16 (M = O and S) methides, M(CH₃)_n. 1995 Jrnl. Electrochem. Soc. 142 l116/1 We have previously synthesized the methide anion [sc. tris(trifluoromethylsulfonyl) methide] in the form of Li⁺ and Cs⁺ salts. 2. More fully quinone methide. A quinone derivative with a methylene group in place of one of the oxygen atoms. ΚΠ 1951 C. A. Redfarn in H. M. Langton Synthetic Resins & Allied Plastics (ed. 3) iii. 136 K. Hultzsch has suggested the theory that when the ether linked compounds are heated above 160°C. they break down to give ortho- and para- quinone methides and their polymers. 1958 N. J. L. Megson Phenolic Resin Chem. iii. 64 The production of quinone methides is of importance to the mechanism of resole formation; but..the methides from para alcohols appear, in general, to form dimers. 1981 Jrnl. Amer. Chem. Soc. 103 5250/2 Described herein are the syntheses of nitrogen-containing polycycles based on this methodology for the generation of N-substituted o-quinone methide imine. 1998 Biochem. Jrnl. 332 367/1 Inactivation proceeds via a quinone methide intermediate formed by the fragmentation of the aglycone of salicortin while it is bound to the enzyme. 3. A carbide whose anion is a single carbon atom (C⁴⁻), and which gives methane on hydrolysis. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > carbon > [noun] > compounds carbonic acid1788 carburet1788 carbure1789 carbonic acid snow1841 carbidec1865 carbon dioxide1867 champagne gas1871 carbon dioxide snow1897 methanide1924 methide1965 carbon1977 1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. xvii. 612 Each [C⁴⁻] anion has then associated with it two tetrahedral holes in which cations may be placed. The alkali-metal ions would be too large and numerous for such a methide lattice..while the alkaline-earth ions would be too large. 1994 D. F. Shriver et al. Inorg. Chem. (ed. 2) xi. 490 Carbides such as Be₂C and Al₄C₃ are borderline between saline and metalloid, and the isolated C ion is only formally C⁴⁻. The existence of directional bonding to the C atom in carbides (as distinct from the nondirectional character expected of purely ionic bonding) is indicated by the crystal structures of methides, which are not those expected for the simple packing of spherical ions. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1851
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