Chromic oxide

Diels-Alder Reaction. In 1928, Diels and Alder discovered that 1,3-unsaturated organic compounds reacted with quinoid systems to give partially hydrogenated, cycHc compounds. In the course of their work, they found that 1 mol of 1,4-naphthoquinone [130-15-4] reacted readily with 1 mol of 1,3-butadiene [106-99-0] to give a partially hydrogenated anthraquinone (11) l,4,4a,9a-tetrahydro-9,10-anthracenedione [56136-14-2] which, on oxidation with chromic oxide, produced anthraquinone (43) ... [Pg.424]

Chromium carbide can be best prepared from pure chromic oxide [1308-38-9] (see Chromium compounds). Compacts containing 74 wt %... [Pg.451]

The compounds are sold on a specification of chromic oxide content, 20.5—25% Cr202, and basicity, 30—58%. Solutions are also available. [Pg.139]

Alloys./ A substantial amount of chromic oxide is used in the manufacture of chromium metal and aluminum—chromium master alloys. [Pg.150]

Methyl ketones are important intermediates for the synthesis of methyl alkyl carbinols, annulation reagents, and cyclic compounds. A common synthetic method for the preparation of methyl ketones is the alkylation of acetone derivatives, but the method suffers limitations such as low yields and lack of regioselectivity. Preparation of methyl ketones from olefins and acetylenes using mercury compounds is a better method. For example, hydration of terminal acetylenes using HgSO gives methyl ketones cleanly. Oxymercuration of 1-olefins and subsequent oxidation with chromic oxide is... [Pg.11]

Aluminium alkyls Chromic oxide Alkylations/Grignard reactions Acute thermal burns, lung damage Cr may be converted to the more toxic and carcinogenic Cr ... [Pg.121]

Chemical Designations - Synonyms-. Chromic Acid Chromic Oxide Chromium Trioxide Chemical Formula-. C1O3. [Pg.86]

Another manifestation of the reactivity at this center is the ease of oxidation. Chromic oxide and selenium dioxide convert yobyrine... [Pg.154]

Chromi-nydroxyd, n. chromic hydroxide, chro-mium(III) hydroxide, -oxyd, n. chromic oxide, chromium(III) oxide, -rhodanwasser-stoffsMure, /. chromithiocyanic acid, thio-cyanatochromic(III) acid, -salz, n. chromic salt, chromium(III) salt, -suifat, n. chromic sulfate, chromium(III) sulfate, -suifocyan-saure, /. chromithiocyanic acid, thiocyana-tochromic(III) acid, -verbindung,/. chromic compound, chromium(III) compound. [Pg.92]

The facile and selective oxidation of both primary and secondary hydroxy groups with certain nucleotides led Pfitzner and Moffatt (48) to explore the scope of the carbodiimide-methyl sulfoxide reagent with steroid and alkaloid alcohols. Relatively minor differences were apparent in the rate of oxidation of epimeric pairs of 3- and 17- hydroxy steroids whereas the equatorial lLx-hydroxyl group in several steroids was readily oxidized under conditions where the axial epimer was unreactive [cf. chromic oxide oxidation (51)]. [Pg.66]

Chromic oxide, Cr,03, is used as a green pigment and is often made by the reaction between NajCrjOjfs) and NH(ClfsJ to give Cr >rfs), NaCl(s), Nifg), and HjO(g). Write a balanced equation and calculate how much pigment can be made from 1.0 X 101 kg of sodium dichromate. [Pg.410]

Chromic Perchlorate. Cr(C104)3, mw 350.30, OB to CrO HCI +28.5% only the hexahydrate has been prepd as blue-green delq crysts, mp 94° (Refs 1, 5 6) CA Registry No 13537-21-8 Preparation. By dissolving hydrated chromic oxide in 20% perchloric ac followed by-evapn of the soln (Ref 4)... [Pg.632]

Eskolaite Cr203 Chromic oxide. A result of corrosion of stainless steels. [Pg.269]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 , Pg.33 , Pg.34 , Pg.50 , Pg.76 ]

See also in sourсe #XX -- [ Pg.86 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 , Pg.33 , Pg.34 , Pg.50 , Pg.76 ]

See also in sourсe #XX -- [ Pg.46 , Pg.69 ]

See also in sourсe #XX -- [ Pg.172 ]

See also in sourсe #XX -- [ Pg.9 , Pg.225 ]

See also in sourсe #XX -- [ Pg.46 , Pg.69 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 , Pg.33 , Pg.34 , Pg.50 , Pg.76 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 , Pg.33 , Pg.34 , Pg.50 , Pg.76 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 , Pg.33 , Pg.34 , Pg.50 , Pg.76 ]

See also in sourсe #XX -- [ Pg.2 , Pg.169 ]

See also in sourсe #XX -- [ Pg.4 , Pg.31 ]

See also in sourсe #XX -- [ Pg.36 ]

See also in sourсe #XX -- [ Pg.2 , Pg.3 , Pg.4 , Pg.5 , Pg.6 , Pg.7 , Pg.8 , Pg.9 , Pg.10 , Pg.11 ]

See also in sourсe #XX -- [ Pg.30 ]

See also in sourсe #XX -- [ Pg.7 , Pg.140 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 , Pg.33 , Pg.34 , Pg.50 , Pg.76 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 , Pg.33 , Pg.34 , Pg.50 , Pg.76 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 , Pg.33 , Pg.34 , Pg.50 , Pg.76 ]

See also in sourсe #XX -- [ Pg.4 , Pg.31 ]

See also in sourсe #XX -- [ Pg.30 ]

See also in sourсe #XX -- [ Pg.2 , Pg.152 ]

See also in sourсe #XX -- [ Pg.4 , Pg.6 , Pg.31 , Pg.32 , Pg.33 , Pg.50 ]

See also in sourсe #XX -- [ Pg.86 ]

See also in sourсe #XX -- [ Pg.2 , Pg.152 ]

See also in sourсe #XX -- [ Pg.70 ]

See also in sourсe #XX -- [ Pg.138 , Pg.147 , Pg.151 ]

See also in sourсe #XX -- [ Pg.2 , Pg.3 , Pg.382 , Pg.384 , Pg.401 , Pg.402 , Pg.403 , Pg.406 ]

See also in sourсe #XX -- [ Pg.24 ]

See also in sourсe #XX -- [ Pg.23 ]

See also in sourсe #XX -- [ Pg.560 ]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...