Acetates green copper

Copper compounds are used routinely and widely to control freshwater snails that serve as intermediate vectors of schistosomiasis and other diseases that afflict humans (Hasler 1949 NAS 1977 Rowe and Prince 1983 Winger etal. 1984 Al-Sabri etal. 1993). These compounds include copper sulfate, copper pentachlorophenate, copper carbonate, copper-tartaric acid, Paris green (copper arsenite-acetate), copper oxide, copper chloride, copper acetyl acetonate, copper dimethyl dithiocar-bamate, copper ricinoleate, and copper rosinate (Cheng 1979). Also, many species of oyster enemies are controlled by copper sulfate dips. All tested species of marine gastropods, tunicates, echinoderms, and crabs that had been dipped for 5 seconds in a saturated solution of copper sulfate died if held in air for as little as a few seconds to 8 h mussels, however, were resistant (MacKenzie 1961). 

It exhibits a transition point at 76 to 78°. The blue double salt becomes moist in spots and changes into a green copper salt interspersed with needles of white calcium acetate. 

Green Ink.—Klaproth directs for the preparation of green ink, that two parte of acetate of copper and one of bitartrate of potassa be boiled in eight parts of water, till the solution be reduced to half the bulk. It is then filtered through cloth, and after cooling, bottled. 

A powder which burns with a green flame is obtained by the addition of nitrate of baryta to chlorate of potash, nitrate of potash, acetate of copper. A white flame is made by the addition of sulfide of antimony, sulfide of arsenic, camphor. Red by the mixture of lampblack, coal, bone ash, mineral oxide of iron, nitrate of strontia, pumice stone, mica, oxide of cobalt. Blue with ivory, bismuth, alum, zinc, copper sulfate purified of its sea water [sic]. Yellow by amber, carbonate of soda, sulfate of soda, cinnabar. It is necessary in order to make the colors come out well to animate the combustion by adding chlorate of potash.15... 

Published methods for decarboxylation of indole-2-carboxylic acid to form indole include pyrolysis or heating with copper-bronze powder, cop-per(I) chloride, copper chromite, copper acetate or copper(II) oxide, in for example, heat-transfer oils, glycerol, quinoline or 2-benzylpyridine. Decomposition of the product during lengthy thermolysis or purification affects the yields. From the perspective of green and sustainable chemistry, these methods have disadvantages associated with the choice of media and reagents as well as with the yields. Quite remarkably, however, in water at 255 °C, decarboxylation was quantitative within 20 min (Scheme 20) [77]. 

Such a system is monovariant under a given pressure there exists a well-determined temperature for which it may exist in equilibrium this temperature is the tmnsformation point of the cupricalcium acetate under the given pressure if the temperature is less than the transformation point, the two simple salts combine and the cupricalcium acetate is formed if, on the contrary, the temperature is higher than the transformation point, the cupricalcium acetate decomposes and there is formed copper acetate and calcium acetate calcium acetate is uncolored, copper acetate green, and cupricalcium acetate blue, so that these transformations are accompanied by color changes which facilitate the study, as was first shown by Van t Hoff and Ch. van Deventer. Reicher has shown that the transformation point of cupricalcium acetate, at atmospheric pressure, is included between +76 C. and 78° C. 

Binacetate of Copper. Verdigris, dissolved iu vinegar with too aid of heat, forms dark green or blue crystals of binacetate of copper. This is the commercial acetate of copper. 

The deposit was extracted with caustic potash solution and excess of acetic acid and copper acetate solution added dark brown copper apocrenate was precipitated. Ammonium carbonate then precipitated light green copper crenate from the filtrate. By decomposing the copper salts in water by hydrogen sulphide solutions of the acids were formed. These on evaporation in vacuum left amorphous yellow crenic acid and dark brown apocrenic acid. 

Pale yellow inner complex copper sahcylaldoxime (II) is precipitated. The test for hydroxylamine based on this behavior, like (1), consists therefore in the formation of an inner complex salt from its components. A stock mixture of salicylaldehyde and copper acetate cannot be used as a reagent, because, depending upon the concentration, a green copper salt of salicylaldehyde separates after short or long standing. The reagents must be added separately to the solution in the prescribed order, and concentrations. 

Chromatex group Copper arsenite group Atacamite Barium chro-mate(VI) Baryte Bismuth chromate Copper tartrate Lead chromate Acetate green Bremen blue Chrome yellow Green cinnabar Green verditer Prussian blue... 

Copper acetate group Copper arseuite group Copper formate group Emerald green Pey (1987)... 

Grunspan is the German term for the synthetic green copper acetates known generally as verdigris (. v.). The name is believed to have been derived from viride hispanicum, Spanish green (Kiihn, 1993a). 

Copper arsenite group Baryte Copper acetate arsenite Copper hydroxide Gypsum Lime Brunswick green Emerald green Imperial... 

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