Dibromine oxide

Dibismuth ditellurium selenide, 4 25 Dibismuth ditellurium sulfide, 4 25 Dibismuthenes, 4 30-31 Dibismuthines, 4 29-30 Diblock copolymers, 7 646 23 367 Diborane, 13 619, 632, 634 Diborane(6), 4 141, 142, 184-185 bonding, 4 181 economic aspects, 4 228 physical properties of, 4 184t Diboron dioxide, 4 242t Diboron trioxide, 4 242t, 246 Dibromamine, 13 103 Dibromamine-B, 13 109 N, N-Dibromamines, 13 105 Dibromamine-T, 13 109 Dibromanine, 4 319 Dibromine oxide, 4 332... 

Dibromine oxide, BrgO, a dark brown liquid, is made in a similar way to ClgO it is formally the anhydride of hypobromous acid. 

Show the mechanism (sequence of molecular events) of the reaction that occurs when dibromine oxide, Br20, is placed in water. Briefly rationalize your mechanism. Name the resulting acid or base before it dissociates in aqueous solution. 

Dibromine monoxide, BtjO, is prepared, similar to the corresponding dichlorine compound, by the action of a solution of bromine in carbon tetrachloride on yellow mercury(II) oxide ... 

Similar oxidations also occurred with enamine substrates. In the reaction outlined in Scheme 8 [18], the formation of a dibrominated product arose because of the initial oxidation of an enamine... 

In 2003, Kulkarni and coworkers presented a method for the -selective oxybromi-nation of a variety of substituted phenols employing a novel heterogeneous catalytic system, the CrZSM-5 as catalyst, H2O2 as oxidant and KBr as bromine source ". Next to CrZSM-5 also other zeolites have been tested as catalysts, but although MoZSM-5 showed the highest conversion after 5 hours (89%), para-selectivity was lower (para 36% ortho 31% dibromination 22%) than observed with the CrZSM-5 material (83%... 

Several attempts have been made, especially in recent years, to oxidize saturated to unsaturated azlactones. 64 The oxidation of saturated azlactone 13 with DDQ or o-chloranil in the presence of collidine as a weak base affords the unsaturated azlactone 14 in 40-50% yield (Scheme 5). Breitholle and Stammer 65 reported the preparation of unsaturated azlactone 16 by dehydrobromination of the bromopseudoazlactone 15 (Scheme 5). The pseudoazlactones derived from Ala and Abu tend to dibrominate, but careful reaction conditions allowed their isolation in acceptable yields. 65 This procedure is applicable to the preparation of derivatives of AAla, AAbu, AVal, and ALeu. 66 ... 

Anthracene was oxidized to anthraquinone. dibrominated, and the dibromo derivative subjected to a caustic fusion. Alizarin was obtained in an impure form and in low yield. This represented the first synthesis of a natural dye. 

Analogous to the Wit tig olefmation, triphenylphosphine and carbon tetrabromide react to give an intermediate dibrominated phospho-nium ylide. Ylide 33 extends the chain of aldehyde 11 with elimination of triphenylphosphine oxide to give 1,1-dibromoalkene 12.17... 

Di[bis(trifluoromethyl)phosphido]mercury, 1371 f Diborane(6), 0166a Diboron oxide, 0169 Diboron tetrachloride, 0161 Diboron tetrafluoride, 0162 Dibromine pentoxide, 0276 Dibromine trioxide, see Bromine bromate, 0275 Dibromoacetylene, 0579... 

Addition of dibromine or diiodine to the divalent organotin compound bis[8-(dimethylamino)-l-naphthyl]tin(II) affords in a quantitative oxidative-addition reaction bis[8-(dimethylamino)-l-naphthyl]tin dibromide 108 and diiodide 109, respectively (152)... 

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