Green, Acid Solid

It is of primary interest to avoid corrosive mineral acids in synthetic processes. This can easily be achieved by use of acidic solid supports coupled with microwave irradiation. This has been applied to the preparation of quinolines [53] (Scheme 8.35). This procedure is a safe, green alternative to the use of H2S04 at more than 150 °C. In the same way, quinoxaline-2,3-diones were prepared [54] by use of single-mode irradiation. Previous attempts in solution led to explosions, but the authors successfully used solvent-free conditions with acidic supports or catalysts (the best being p-toluenesulfonic acid) and irradiation times of 3 min (Scheme 8.36). 

Natural malachite is a dark green crystalline solid monoclinic crystals density 4.0 g/cm refractive index 1.655 decomposes at 200°C insoluble in cold water and alcohols decomposes in hot water soluble in acids, ammonium hydroxide and potassium cyanide solutions. 

The tetrahydrate is a green crystalline solid sweet taste odor of acetic acid density 1.744 g/cm loses water on heating to form a yellow-green powder of anhydrous nickel acetate decomposes above 250 C soluble in water, 17g/100mL at 20 C sparingly soluble in alcohol. 

Sulphur dioxide reduces the acid solution to cyanoplatinous acid. Heated to 120° C. the solid green acid is converted into a light yellow residue consisting mainly of platinum tricyanide, Pt(CN)3. 

Hydroxycarboxylate compounds of Mn111 are known for salicylates and various aliphatic acids.299 Some crystalline solids have been isolated, including bis-chelate species of the salicylates M[Mn(X-sal)2L2] (L = H20, py) but the only tris-chelate compound isolated is the black Cs3[Mn (CF2)2C(0)COO 3]. Various red or green crystalline solids also are known with tartrate ligands and they are reasonably robust, but no structural data are available. 

Keh, C. C. K., Li, C.-J. Direct formation of 2,4-disubstituted tetrahydropyranols in water mediated by an acidic solid resin. Green Chem. 

A sample of 1,10-phenanthroline monohydrate (3.96 g, 20 mmole) in 20 mL ethanol is added to a solution of copper(II) chloride dihydrate (3.40 g, 20 mmole) in 40 mL ethanol. A suspension of a green-blue solid develops immediately. A solution of malonic acid (2.08 g, 20 mmole) in 50 mL ethanol is then slowly introduced into this suspension, which is being stirred magnetically. This... 

These copper(II) ternary complexes are generally green-blue solids, stable in air, and fairly soluble in water, methanol, and ethanol. Furthermore, those with dicarboxylates and amino acid residues exhibit a characteristic, strong infrared absorption band around 1600 cm"1 due to the coordinated carboxylate group. The infrared spectra from 4000-200 cm 1 as well as the electronic spectra of these complexes have been recorded and assignments made.5 6... 

COpper(ll) carbonate Its formula is CUCO3, but it is unknown in this state. It occurs as CuC03.Cu(0H)2, a green insoluble solid. It is soluble in both dilute acids and ammonia solution. It decomposes to form copper oxide, carbon dioxide, and water vapor when heated. 

Volatile boron compounds burn with a green flame. If a solid borate is mixed with methanol and concentrated sulphuric acid, the volatile compound boron trimethoxide, BfOCHj j, is formed and ignition of the alcohol therefore produces a green flame ... 

Dissolve 1 g. of the secondary amine in 3-5 ml. of dilute hydrochloric acid or of alcohol (in the latter case, add 1 ml. of concentrated hydrochloric acid). Cool to about 5° and add 4-5 ml. of 10 per cent, sodium nitrite solution, and allow to stand for 5 minutes. Add 10 ml. of water, transfer to a small separatory funnel and extract the oil with about 20 ml. of ether. Wash the ethereal extract successively with water, dilute sodium hydroxide solution and water. Remove the ether on a previously warmed water bath no flames should be present in the vicinity. Apply Liebermann s nitroso reaction to the residual oil or solid thus. Place 1 drop or 0 01-0 02 g. of the nitroso compovmd in a dry test-tube, add 0 05 g. of phenol and warm together for 20 seconds cool, and add 1 ml. of concentrated sulphuric acid. An intense green (or greenish-blue) colouration will be developed, which changes to pale red upon pouring into 30-50 ml. of cold water the colour becomes deep blue or green upon adding excess of sodium hydroxide solution. 

The results of the complexation study of Cu(II), Pb(II), Zn(II), Fe(III), Hg(II), Cd(II), Sn(IV), Zr(IV), Ti(IV) with arsenazo III, sulfonazo III, SPADNS, Eriochrome T, Acid Chrome Dai k Blue, Xylenol Orange, Methyl Thymol Blue, Pyrocatechol Violet, Chrome Azurol S, Eriochrome Cyanin R, Basic Blue K, Methyl Violet, Brilliant Green, Rhodamine C and Astraphoxin in solid phase. The obtained data ai e used for the working out of a new method of metal determination. 

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