Cuprous bromide, and

CH-OC-H-(CN) which on treatment with cuprous bromide and substi-Z O 3 Z... 

Since sodium borohydride usually does not reduce the nitrile function it may be used for selective reductions of conjugated double bonds in oc,/l-un-saturated nitriles in fair to good yields [7069,1070]. In addition some special reagents were found effective for reducing carbon-carbon double bonds preferentially copper hydride prepared from cuprous bromide and sodium bis(2-methoxyethoxy)aluminum hydride [7766], magnesium in methanol [7767], zinc and zinc chloride in ethanol or isopropyl alcohol [7765], and triethylam-monium formate in dimethyl formamide [317]. Lithium aluminum hydride reduced 1-cyanocyclohexene at —15° to cyclohexanecarboxaldehyde and under normal conditions to aminomethylcyclohexane, both in 60% yields [777]. 

This complex is prepared from cuprous bromide and dimethyl sulfide according to the procedure of House. The complex must be pure white. Slightly Impure samples will produce pinkish solutions which are unsatisfactory for this procedure. Normally, the complex is dark red when it is first prepared, but the required state of purity can be achieved by two or three recrystallizations under a nitrogen atmosphere as described by House.2 We have found, however, that if the Initially-formed complex has a distinctly green appearance, it cannot be purified satisfactorily. Others have also been concerned about this matter of purification. 

Oxidation of Mixtures of Monomers. The method most likely to yield random copolymers of DMP and DPP is the simultaneous oxidation of a mixture of the two phenols, although this procedure may present problems because of the great difference in reactivity of the two phenols. The production of high molecular weight homopolymer from DPP is reported to require both a very active catalyst, such as tetramethylbutane-diamine-cuprous bromide, and high temperature, conditions which favor carbon-carbon coupling and diphenoquinone formation (Reaction 2) from DMP (II). With the less active pyridine-cuprous chloride catalyst at 25 °C the rate of reaction of DMP, as measured by the rate of oxygen... 

Cuprous bromide and l-octyn-3-ol were used as supplied by the Aldrich Chemical Company, Inc. Dioxane was dried over sodium/benzophenone and distilled, and diisopropylamine was distilled from barium oxide. 

Replacement of the Diazonium Group by Chloride, Bromide, and Cyanide The Sandmeyer Reaction Copper salts (cuprous salts) have a special affinity for diazonium salts. Cuprous chloride, cuprous bromide, and cuprous cyanide react with arenediazonium salts to give aryl chlorides, aryl bromides, and aryl cyanides. The use of cuprous salts to replace arenediazonium groups is called the Sandmeyer reaction. The Sandmeyer reaction (using cuprous cyanide) is also an excellent method for attaching another carbon substituent to an aromatic ring. 

From the reaction of cuprous bromide and diphenylmagnesium, a complex with the composition Cu4Mg(/i-Ph)4 (76) was obtained (77). Structural characterization of 76 revealed the presence of five metal atoms arranged in a trigonal bipyramidal fashion, with the magnesium atom at one of the axial positions. There are six phenyl groups bridging between the... 

This complex 1s prepared from cuprous bromide and dimethyl sulfide... 

The various aspects of oxidative polymerization of phenols have been thoroughly reviewed. Most commonly PPEs are produced by the self-con-densation of a monovalent phenol in the presence of oxygen and a metal-amine-complex catalyst. Manganese, copper and cobalt can be used as the metal in the catalyst. Cu+ is most commonly utilized. For example, the preparation of the catalyst can be achieved by stirring cuprous bromide and di-n-butyl amine in toluene. ... 

Arenediazonium salts react with cuprous chloride, cuprous bromide, and cuprous cyanide to give products in which the diazonium group has been replaced by —Cl, —Br, and — CN, respectively. These reactions are known generally as Sandmeyer reactions. Several specific examples follow. The mechanisms of these replacement reacaiions are not fully understood the reactions appear to be radical in nature, not ionic. 

Traugott Sandmeyer (Wettingen, 15 September 1854-Zurich, 9 April 1922) was Victor Meyer s lecture assistant and participated in the discovery of thiophen (see p. 810). He discovered the Sandmeyer reaction for the preparation of halogen derivatives of aromatic hydrocarbons by warming a solution of a diazonium compound with cuprous chloride and hydrochloric acid, or cuprous bromide and hydrobromic acid, or with hydriodic acid or potassium... 

C) Some salts do not obey any simple conductivity-temperature law, as Fig. 94 illustrates in the case of cuprous bromide, and Fig. 95 for silver iodide and silver mercury iodide (Ag2Hgl4). Each transition point shows a sharp break in the conductivity-temperature curve, and the conductivity of a-CuBr and a-AgI can actually be greater in the solid state than in the molten state. In the case of cuprous bromide one notes (Fig. 94) that in addition to the basic curve III some irreversible curves are also shown (I, IIa, II5). This peculiarity is due to the extreme sensitivity of the conductivity of cuprous bromide to excess halogen, and to the difficulty of excluding traces of such impurities, which are sufficient to raise the conductivity by several powers of ten. 

Several polyfluorinated aryl azides (CeFs-Nj, /J-Ns CeFi Ns, p-Cl CsFi Nj, and i CFJ C F4-Ns) have been synthesized by treatment of the corresponding fluorides with sodium azide in dirnethylformamide. Catalytic hydrogeno-lysis of the azide C,FB-CHg CH(N3) COjH, prepared by Meerwein arylation of acrylic acid with pentafluorobenzenediazonium bromide-cuprous bromide and treatment of the product, a-bromo-/3-pentafluorophenyIpropionic acid (45), with sodium azide, has been used to obtain ( >pentafluorophenyl-alanine this a-amino-acid has also been prepared by the aziactone route shown in Scheme 22 and by the acetamidomalonate procedure depicted in Scheme 23 (the preferred method). Application of the last method to p-MeO-CjFB-CHjBr has been used to obtain the fluoro-tyrosine ( )-p-... 

---