Type C oxides

FIGURE 5.41 Structural possibilities for binary oxides, (a) Type A oxides metal excess/anion vacancies, (i) This shows the two electrons that maintain charge neutrality, localized at the vacancy, (ii) The electrons are associated with the normal cations making them into M. (b) Type B oxides metal excess/interstitials. (i) This shows an interstitial atom, whereas in (ii) the atom has ionized to and the two liberated electrons are now associated with two normal cations, reducing them to M. (c) Type C oxides metal deficiency/interstitial anions. The charge compensation for an interstitial anion is by way of two ions, (d) Type D oxides metal deficiency/cation vacancies. The cation vacancy is compensated by two cations. 

From y-Aminoalkyl Thioethers Type C). Oxidation of methionine with iodine gives S-methylisothiazolidinium-3-carboxylate (9). This is a general reaction for compounds having an amino-group that is y to a thioether function, and thus forms a convenient route for the preparation of N-protonated cyclic sulphilimines. ... 

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