Potassium chromate-sulfuric acid

The utility of 413 is illustrated in the five-step synthesis of 2-amino-2-deoxy-L-threitol (414), which is oxidized either to 2-amino-2-deoxy-L-erythrose (415) under Swem conditions or to 2-amino-2-deoxy-L-erythronic acid (416) under potassium chromate—sulfuric acid conditions (Scheme 92). [Pg.380]

Potassium chromate Potassium iodide Sulfuric acid, dilute Hydrogen sulfide gas Potassium cyanide... [Pg.536]

Lead chromate Sulfur Lead(II) chlorite Non-metals Phosphorus(III) oxide Potassium bromate Non-metals Potassium chlorate Charcoal, etc., or Non-metals Potassium chlorite Sulfur Potassium perchlorate Sulfur Potassium permanganate Non-metals Silver bromate Sulfur compounds Silver chlorite Hydrochloric acid, etc. [Pg.1990]

Sodium rhodizonate Strontium (II), Sr2 Ammonium carbonate Dilute sulfuric acid Saturated calcium sulfate Potassium chromate Ammonium oxalate... [Pg.539]

Oxidation of alcohols. Primary and secondary alcohols can be oxidized to aldehydes and ketones, respectively, by potassium chromate and sulfuric acid in a two-phase system (CHCI3-H2O) in the presence of tetra- -butylammonium hydrogen sulfate as catalyst. The method is particularly useful for oxidation of primary... [Pg.485]

Potassium tris(malonato)chromate(IIl) trihydrate can be prepared by the method of Lapraik, reacting freshly precipitated chromium(III) hydroxide with malonic acid and potassium carbonate. Lapraik obtained the crystals by drying the aqueous solution over sulfuric acid, but the crystals are more easily obtained by precipitation in ethanol. [Pg.81]

Potassium Tetraperoxo-chromate (3 ), CrKaOg Explodes at 178° or in contact with sulfuric acid the impure salt is explosive MeUor 11 (1943), 356... [Pg.675]

Potassium chromate, K2Cr04, is used very rarely. It converts hydra-zomethane into azomethane [613]. In the presence of hexamethylphos-phoramide and crown ether, it transforms allylic and benzylic bromides into a,p-unsaturated aldehydes [614], and in the presence of dilute sulfuric acid, it oxidizes chlorohydroquinone to chloro-p-benzoquinone [615]. [Pg.23]

Derivation (a) By extraction with dilute sulfuric acid from the anthracene fraction from coal tar and adding potassium dichromate. The acridine chromate precipitated is recrystallized, treated with ammonia, and recrystallized, (b) Synthetically. Hazard Strong skin irritant. [Pg.19]

AMMONIUM NITRATE (6484-52-2) A strong oxidizer. An ingredient in dynamite. Violent reaction and/or the formation of explosive mixtures with hot water, reducing agents, combustible materials, organic materials, ammonium dichromate, barium chloride, barium nitrate, charcoal, cyanoguanidine, phosphorus, potassium chromate, potassium dichromate, potassium nitrate, potassium permanganate, sodium chloride, finely divided metals. Forms explosive or heat- and shock-sensitive compounds with acetic acid, alkali metals (potassium, sodium, etc.), ammonia, nitric acid, sodium hypochlorite, sulfur, urea. At elevated temperatures, contained or confined material may explode violently. [Pg.101]

BENSULFOID (7704-34-9) Combustible solid (flash point 405°F/207°C). Finely divided dry materia forms explosive mixture with air. The vapor reacts violently with lithium carbide. Reacts violently with many substances, including strong oxidizers, aluminum powders, boron, bromine pentafluoride, bromine trifluoride, calcium hypochlorite, carbides, cesium, chlorates, chlorine dioxide, chlorine trifluoride, chromic acid, chromyl chloride, dichlorine oxide, diethylzinc, fluorine, halogen compounds, hexalithium disilicide, lampblack, lead chlorite, lead dioxide, lithium, powdered nickel, nickel catalysis, red phosphorus, phosphorus trioxide, potassium, potassium chlorite, potassium iodate, potassium peroxoferrate, rubidium acetylide, ruthenium tetraoxide, sodium, sodium chlorite, sodium peroxide, tin, uranium, zinc, zinc(II) nitrate, hexahydrate. Forms heat-, friction-, impact-, and shock-sensitive explosive or pyrophoric mixtures with ammonia, ammonium nitrate, barium bromate, bromates, calcium carbide, charcoal, hydrocarbons, iodates, iodine pentafluoride, iodine penloxide, iron, lead chromate, mercurous oxide, mercury nitrate, mercury oxide, nitryl fluoride, nitrogen dioxide, inorganic perchlorates, potassium bromate, potassium nitride, potassium perchlorate, silver nitrate, sodium hydride, sulfur dichloride. Incompatible with barium carbide, calcium, calcium carbide, calcium phosphide, chromates, chromic acid, chromic... [Pg.156]