disproportionationn.

Etymology: < disproportion n. or disproportion v. + -ation suffix.Previous versions of the OED give the stress as: disproportioˈnation.

Chemistry.

A transfer of atoms or valency electrons between two or more identical molecules or ions, resulting in molecules or ions containing the same elements in different proportions or in different oxidation states.

ΚΠ

1929 E. E. Reid Coll. Org. Chem. xxxiv. 550 Reactions of this sort have received the name ‘disproportionation’.

1939 Jrnl. Amer. Chem. Soc. 61 2769/2 The identification of tri-p-tolymethane..and a polymeric residue as the products of disproportionation of tri-p-tolylmethyl..makes it possible to suggest a mechanism for the reaction.

1946 Nature 9 Nov. 673/1 The disproportionation proceeds to about one third of completion, at which point an equilibrium is set up... Disproportionation occurs during the fluorination.

1960 Times Rev. Industry Sept. 55/1 Disproportionation of the monochloride into metallic aluminium.

1969 Nature 19 Apr. 257/1 Disproportionation of MSiO₃ composition into M₂SiO₄ olivine yields SiO₂.

This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2019).

单词	disproportionation
释义	disproportionationn. Etymology: < disproportion n. or disproportion v. + -ation suffix.Previous versions of the OED give the stress as: disproportioˈnation. Chemistry. A transfer of atoms or valency electrons between two or more identical molecules or ions, resulting in molecules or ions containing the same elements in different proportions or in different oxidation states. ΚΠ 1929 E. E. Reid Coll. Org. Chem. xxxiv. 550 Reactions of this sort have received the name ‘disproportionation’. 1939 Jrnl. Amer. Chem. Soc. 61 2769/2 The identification of tri-p-tolymethane..and a polymeric residue as the products of disproportionation of tri-p-tolylmethyl..makes it possible to suggest a mechanism for the reaction. 1946 Nature 9 Nov. 673/1 The disproportionation proceeds to about one third of completion, at which point an equilibrium is set up... Disproportionation occurs during the fluorination. 1960 Times Rev. Industry Sept. 55/1 Disproportionation of the monochloride into metallic aluminium. 1969 Nature 19 Apr. 257/1 Disproportionation of MSiO₃ composition into M₂SiO₄ olivine yields SiO₂. This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2019). < n.1929
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