Chrome anhydride

It has not yet been possible to isolate noradrenolutin from the products of the direct rearrangement of noradrenochrome in solution. [Noradrenolutin should probably be formulated in the keto form (38) however, it is often represented in the trihydroxy form (39).] However, pure samples of this valuable compound have recently been obtained by the cautious hydrolysis of 3,5,6-triacetoxyindole (40),70,71 obtained by deiodination of 3,5,6-triacetoxy-7-iodoindole (41),70,71 which can readily be obtained by the action of acetic anhydride and pyridine on 7-iodonoradrenochrome (42).70,71,74 7-Iodonoradreno-chrome (42) has been prepared in pure crystalline form by the oxidation of noradrenaline (43) with potassium iodate.70,71... 

In 1997, the major manufacturers of chromium compounds were (1) chromic(VI) acid, including chromic(VI) anhydride and chromic(VI) trioxide (total capacity 76,000 metric tons) American Chrome Chemicals Inc., Corpus Christi, Texas Occidental Chemical Corporation Specialty Business Group, Castle Hayne, North Carolina (2) chromium(III) sulfate Blue Grass Chemical Specialties, L.P., New Albany, Indiana Johnson Matthey, Inc., Ward Hill, Massachusetts Wayne Chemical Corp., Amarillo, Texas, Dakota City, Nebraska, and Milwaukee, Wisconsin (3) chromium(III) acetate Blue Grass Chemical Specialties, L.P., McGean-Rohco, Inc., Cleveland, Ohio The Shepard Chemical Company, Cincinnati, Ohio (4) chromium acetylacetonate MacKenzie Corporation, Bush, Louisiana The Shepard Chemical Company, Cincinnati, Ohio (5) chromium boride Cerac Incorporated, Milwaukee,... 

NIOSH REL (Chromium(VI)) TWA 0.025 mg(Cr(VI))/mh CL 0.05/15M SAFETY PROFILE Confirmed human carcinogen. Poison by subcutaneous route. Mutation data reported. A powerful oxidizer. A powerful irritant of skin, eyes, and mucous membranes. Can cause a dermatitis, bronchoasthma, chrome holes, damage to the eyes. Dangerously reactive. Incompatible with acetic acid, acetic anhydride, tetrahydronaphthalene, acetone, alcohols, alkali metals, ammonia, arsenic, bromine penta fluoride, butyric acid, n,n-dimethylformamide, hydrogen sulfide, peroxyformic acid, phosphorus, potassium hexacyanoferrate, pyridine, selenium. 

SYNS ANHYDRIDE CHROMIQUE (FRENCH) ANIDRIDE CROMICA (ITALIAN) CHROME (TRIOXYDE de) (FRENCH) CHROMIC ACID CHROMIC(VI) ACID CHROMIC ACID, soKd (NA 1463) (DOT) CHROMIC ACID, solution (UN 1755) pOT) CHROMIC ANHYDRIDE CHROMIC TRIOXIDE CHROMIUxM OXIDE CHROMIUM(VI) OXIDE CHROMIUM TRIOXIDE CHROMIUM(6+) TRIOXIDE CHROMIUM TRIOXIDE, anhydrous pOT) CHROMIUM TRIOXIDE, anhydrous pN 1463) pOp CHROMO (TRIOSSIDO di) (ITALIAN) CHROMS-AEUREANHYDRID (GERMAN) CHROMTRIOXID (GERMAN) CHROOMTRIOXYDE pUTCH) CHROOMZUURANHYDRIDE pUTCH) MONO-CHROAQUM OXIDE D MONOCHROMIUM TRIOXIDE O PURATRONIC CHROMIUM TRIOXIDE... 

Chromium in its Compounds is sometimes metallic and sometimes non-metallic toward the other components. Thus, in chromium trioxide, CrOg, the anhydride of the hypothetical chromic acid, H2Cr04, chromium acts as a non-metal, just like sulphur in sulphuric acid hence in chromates the chromium is acidic, or non-metallic, in its chemical relations with the other elements. In chromic compounds, however, chromium acts as a metal. Thus chromium hydroxide, Cr(OH)3, is analogous to aluminium hydroxide chrome alum is potassium chromium sulphate, and is analogous to aluminium alum. The two classes pass into each other by appropriate operations,... 

Exothermic decomposition with maleic anhydride. Increases the explosive sensitivity of nitromethane. Corrodes many metals steel, 12% and 17% chrome steel, cast iron, monel, aluminum, nickel, brass, bronze, iconel, titanium. 

Keywords fibre, surface, organosilane, titanate, zirconate, chrome complex, surface energy, contact angle, interface, mechanical properties, adhesion, maleic anhydride. 

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