Group 16 oxide halides

Group-IIIB halides sometimes act as oxidizing agents ( 6.5.2.2) ... 

Formation from Group-IIIB Halides 6.5.2.3. by OxIdatIve-AddItion Reactions... 

Aryl Halides from Diazonium Ion Intermediates. Replacement of diazonium groups by halides is a valuable alternative to direct halogenation for the preparation of aryl halides. Aryl bromides and chlorides are usually prepared by a reaction using the appropriate Cu(I) salt, which is known as the Sandmeyer reaction. Under the classic conditions, the diazonium salt is added to a hot acidic solution of the cuprous halide.99 The Sandmeyer reaction occurs by an oxidative addition reaction of the diazonium ion with Cu(I) and halide transfer from a Cu(III) intermediate. 

In the group, the most familiar members are the oxides, halides, hydrides (including the hydrocarbons), nitrides, sulfides, and carbides. Many methods are available for the preparation of binary compounds, and the most general ones will be illustrated by exercises. 

R)C2B4H5] ions and appropriate main group element halides, have structures containing central main group elements in the 4+ oxidation states similar to the bis-dicarbollide silicon sandwich compound. The structure of the silicon sandwich compound 0 0-[ (CH3)3Si 2C2B4H4]2Si is shown in Figure 27. 

Prosthetic heme modification also occurs in some instances with the two-electron oxidation products formed by peroxidases when they oxidize halide and pseudohalide ions. Thus, the oxidation of bromide by HRP results in the addition of HOBr to one or both of the heme vinyl groups (Fig. 5.11) [62], Similar reactions are... 

Oxidation of Substituted Carbonyl Complexes with Group IV Halides and... 

Uranium has sometimes been classed with Mo and W in Group 6, and indeed there are some valid, though often rather superficial, similarities the three elements form volatile hexafluorides, oxide halides, and oxo anions that are similar in certain respects. There is little resemblance to the sulfur group except in regard to stoichiometric similarities (e.g., SeF6, WF6, SO4, and MoO -), and such comparisons are not profitable. 

Recent efforts involving these systems include (i) high-pressure studies and structural phase transformation stabilization of mixed valence main group metal halides (iii) synthesis of low oxidation state halides and (iv) characterization of mixed metal halides. 

In the set of main group metal halides, we could readily systematize the solid-state examples according to group number. Since, in general, several oxidation states are observable for each transition metal, it is more convenient to discuss these halides according to their empirical formulas,... 

Reactions of dinuclear transition metal carbonyls with Ga, In, or T1 in the +1 state proceed by oxidative addition, which leads to insertion of the group IIIB element into the metal-metal bond. From the reaction of InBr with Co2(CO)8 in THE, the product is BrIn[Co(CO)4]2-THF, while the halides Ga2X4 (X = Cl or Br) yield XjGaCoICO) THE, in which both Ga centers attain the +3 stateh The same products can be isolated from reactions of the group IIIB halides, MX3, with NaCo(CO)4 or Co2(CO)g in Thfi-3. 

---