Burgundy mixture

The active substance of Burgundy mixture is also basic copper(II) carbonate. Owing to difficulties in the preparation of Bordeaux mixture, Masson (1887) recommended the use of soda instead of lime. The use of Burgundy mixture increased after the World War I. Its tenacity, however, is inferior to that of Bordeaux mixture and its phytotoxic effect greater. 

Burgundy Mixture. Soda Bordeaux. Variable cornpii. considered to be basic cupric carbonate and/or sul -late Prepd by reaction of aq solns of CuS04 and Na2COj Frear. Chemistry of the Pesticides (Van Nostrand, 3rd ed., 1955) p 322 Mond, Haberlein, J. Chem. Soc. 115, 908 (1919), See aim Cupric Sulfate, Basic. 

B. Mix 1 drop or several small crystals (ca. 0 05 g.) of the compound with 1 ml. of 0-5 V hydroxylamine hydrochloride in 95 per cent, ethanol and add 0-2 ml ot aqueous sodium hydroxide. Heat the mixture to boiling and, after the solution has cooled slightly, add 2 ml. of N hydrochloric acid. If the solution is cloudy, add 2 ml. of 95 per cent, ethyl alcohol. Observe the colour produced when I drop of 6 per cent, ferric chloride solution is added. If the resulting colour does not persist, continue to add the reagent dropwise until the observed colour pervades the entire solution. Usually only 1 drop of the ferric chloride solution is necessary. Compare the colour with that produced in test. 4. A positive test will be a distinct burgundy or magenta colour as compared with the yellow colour observed when the original compound is tested with ferric chloride solution in the presence of acid. 

The Nenitzescu process is presumed to involve an internal oxidation-reduction sequence. Since electron transfer processes, characterized by deep burgundy colored reaction mixtures, may be an important mechanistic aspect, the outcome should be sensitive to the reaction medium. Many solvents have been employed in the Nenitzescu reaction including acetone, methanol, ethanol, benzene, methylene chloride, chloroform, and ethylene chloride however, acetic acid and nitromethane are the most effective solvents for the process. The utility of acetic acid is likely the result of its ability to isomerize the olefinic intermediate (9) to the isomeric (10) capable of providing 5-hydroxyindole derivatives. The reaction of benzoquinone 4 with ethyl 3-aminocinnamate 35 illustrates this effect. ... 

After 4 teaspoons of base solution, the mixture changed from a burgundy red to a very grayish blue color. The pH was tested and found to be 7. 

Slowly add 100 mL of 20% (v/v) Tween-20 (see Note 4) Leave to stir for 15 min 4. Add dropwise 4 mL of freshly prepared stannous chloride solution to the gold/ Tween mixture (see Note 5) The color of the solution will change from gold to burgundy Leave to stir for 5 min... 

Examination of colophony comprises firstly observation of the external characters (colour, transparency, fracture) and comparison of these with those of commercial grades of known origin determinations 1-6 may also be carried out to ascertain the degree of purity. Lastly, in order to discoverif a product is really colophony and not some similar product such as brewers pitch, Burgundy pitch, resinates, mixtures of colophony with resinates or with resin oils, fatty oils, etc., tests 7-10 may be carried out. 

The deep red mixture is transferred to a 50-ml. beaker, using a minimum volume (15 to 20 ml.) of hot 1 N hydrochloric acid to rinse the last traces from the boat and tube. After being gently heated and stirred until all soluble material has dissolved, the hot burgundy-colored mixture is quantitatively transferred through a double thickness of Whatman no. 42 filter paperf into a 100-ml. beaker with the aid of a minimum volume (about 10 ml. in 2-ml. portions) of hot 1 N hydrochloric acid. 

A solution of dZ-tris(l,10-phenanthroline)nickel(II) chloride is prepared by adding 3.0 g. (0.015 mol) of 1,10-phenanthroline 1-hydrate to a solution of 1.2 g. (0.005 mol) of nickel(II) chloride 6-hydrate in 40 ml. of water. As the mixture is stirred, the white crystals slowly dissolve and the green solution changes to a deep burgundy color. 

Preparation of the resin Polystyrene-divinylbenzene (1%) copolymer 21 (Fluka) was washed [71] to removed shorter polystyrene components and remaining monomers and reagents with each of the following solutions at 60-80°C for 30-60 min NaOH (1 N), HCl (1 N), NaOH (2 N)-dioxane (1 2), HCl (2 N)-dioxane (1 20, water, dimethyl formamide (DMF). The resin was then washed at room temperature with HCl (2 N) in methanol, water, methanol, methanol-dichloromethane (1 3), and methanol-dichlo-romethane (1 10) and the resin was dried at 50-70°C under reduced pressure. The washed polystyrene resin (13 g) was suspended under nitrogen in anhydrous cyclohexane (80 mL) in a 250-mL polymer synthesis flask. Tetra-methylethylenediamine (TMEDA, 20 mL, 132.5 mmol) and n-butyllithium (2.0 M in cyclohexane, 80 mL, 160 mmol) were successively added and the mixture was stirred at 65°C for 4 h. The dark burgundy-colored resin was filtered under nitrogen and washed with anhydrous cyclohexane (2 X 100... 

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