Search results
Results From The WOW.Com Content Network
Copper(II) bromide (Cu Br 2) is a chemical compound that forms an unstable tetrahydrate CuBr 2 ·4H 2 O. It is used in photographic processing as an intensifier and as a brominating agent in organic synthesis .
The hydration and dehydration of salts is central to the use of phase-change materials for energy storage. [2] ... Copper(II) bromide CuBr 2 (H 2 O) 4 [CuBr 4 (H 2 O ...
A stirred BZ reaction mixture showing changes in color over time. The discovery of the phenomenon is credited to Boris Belousov.In 1951, while trying to find the non-organic analog to the Krebs cycle, he noted that in a mix of potassium bromate, cerium(IV) sulfate, malonic acid, and citric acid in dilute sulfuric acid, the ratio of concentration of the cerium(IV) and cerium(III) ions ...
Frequently, however, C–Cl bonds are too inert, and bromide or iodide leaving groups are required for acceptable rates. The main group metal in the organometallic partner usually is an electropositive element such as tin , zinc , silicon, or boron .
Copper bromide can refer to: Copper(I) bromide, CuBr; Copper(II) bromide, CuBr 2 This page was last edited on 31 December 2019, at 11:21 (UTC). Text is ...
The copper(I) ion also oxidizes easily in air. It is commonly prepared by the reduction of cupric salts with sulfite in the presence of bromide. [4] For example, the reduction of copper(II) bromide with sulfite yields copper(I) bromide and hydrogen bromide: 2 CuBr 2 + H 2 O + SO 2− 3 → 2 CuBr + SO 2− 4 + 2 HBr
In the original paper describing this reaction, methylmagnesium bromide is reacted with isophorone with and without 1 mole percent of added copper(I) chloride (see figure). [ 10 ] Without added salt the main products are alcohol B (42%) from nucleophilic addition to the carbonyl group and diene C (48%) as its dehydration reaction product.
The scope of the Corey-House synthesis is exceptionally broad, and a range of lithium diorganylcuprates (R 2 CuLi, R = 1°, 2°, or 3° alkyl, aryl, or alkenyl) and organyl (pseudo)halides (RX, R = methyl, benzylic, allylic, 1°, or cyclic 2° alkyl, aryl, or alkenyl and X = Br, I, OTs, or OTf; X = Cl is marginal) will undergo coupling as the nucleophilic and electrophilic coupling partners ...