Ammonium perrhenate, mixture

Ammonium perrhenate, mixture of, with ammonium nitrate for preparation of rhenium, 1 177, 178... 

The products from cyclization reactions of 4-substituted phthalonitriles are called 2,3-tetrasub-stituted or 2,9,16,23-tetrasubstituted phthalocyanines (see p 724). A mixture of four different structural isomers is obtained (see p 736). Cyclization of 4-/c//-butylphthalonitrile (7) in the presence of ammonium perrhenate(VII) at 290 C affords the nitridorhenium(V) phthalocvanine 8. 

We pioneered the use a noncoherent IR radiation for a formation of the metal -carbon film on a surface of porous inorganic support. In this research the film was obtained from a mixture PAN and ammonium perrhenate solutions in dimethylformamide on the surface of the porous stainless steel. 

Production. The classical method is to mix Re and W powders in the desired ratio prior to compaction and sintering. In order to achieve a more even W-Re distribution, restricting the danger of local a-phase formation, mixtures of tungstic acid or tungsten trioxide or tungsten blue oxide with ammonium perrhenate can be used as raw materials. These mixtures are co-reduced by hydrogen to metal powder. 

Typical procedure. Methyl 2-isocyanato-3-phenylpropenoate 365 [257] At 80 °C, phosgene (for a safe source, see Chapter 7) was passed into a solution of ammonium perrhenate (1 mol%) in ethyl acetate (10 mL) saturated with HCl, until the solution was saturated. A solution of 364 (4.1 g, 20.0 mmol) and hydrochinone (50 mg) in ethyl acetate (10 mL) was then added dropwise, while the mixture was cooled to 65 °C. More phosgene was then passed in, until reaction was complete (monitored by IR spectroscopy). The mixture was filtered at room temperature, the filtrate was concentrated, and the residue was distilled in vacuo to afford 2.77 g (68%) of 365. Author s remark Note Excess phosgene has to be passed into a vessel filled with ethanol to make it harmless, and thereby Hd gas is evolved (see Chapter 7). 

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