| 单词 | manganese dioxide |
| 释义 | > as lemmasmanganese dioxide manganese dioxide n. manganese( iv) oxide, a grey-black solid, MnO2, which occurs naturally as pyrolusite and is used as a catalyst, oxidizing agent, depolarizer in dry cells, and pigment. ΘΚΠ the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > rutile and uranite groups A02 > manganese dioxide brownstone1657 manganese1662 magnesia1677 soap of glass1815 pyrolusite1828 varvicite1829 polianite1849 manganese dioxide1866 pelagite1876 manganese oxide1882 1866 H. E. Roscoe Lessons Elem. Chem. xxi. 190 Manganese Dioxide, MnO2, is the common black ore of manganese, and is termed pyrolusite by mineralogists; it can be artificially formed by adding a solution of bleaching powder to a manganous salt. 1946 Nature 3 Aug. 155/2 Manganese dioxide is reduced with great ease to form divalent manganese ion by sulphydryl compounds. 1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) xviii. 706 Manganese dioxide is inert to most acids except when heated, but it does not dissolve to give MnIV in solution; instead it functions as an oxidizing agent. 1998 Tetrahedron Lett. 39 3815 Propargylic and benzylic alcohols can be oxidized with activated manganese dioxide in the presence of stabilized Wittig reagents to generate alpha, beta-unsaturated esters directly. < as lemmas |
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