Chromates oxidation

Tetrahydrofurfuryl alcohol is oxidized to 2-tetrahydrofurfural [7681-84-7] in good yield by passage, with oxygen, over silver gauze at 500°C (123—124). With chromate oxidizing agents, lactones are also formed (124,125). [Pg.82]

Aluminium and its alloys (a) Alkaline dip Alkaline chromate Oxide/hydroxide with perhaps some chromate... [Pg.723]

The almost universal chromate oxidizers are claimed to be carcinogenic (Ref 67) for which... [Pg.989]

Chromate Oxidations Formation of the Chromate Ester Step 1... [Pg.473]

Other methods for determining the amount of soil organic matter are available [4], However, they are not as commonly used as is chromate oxidation, which is commonly called the Watley-Black method. Usually, these other methods are both more time-consuming and less accurate than is the dichromate oxidation method. The dichromate oxidation of organic matter is the standard by which all other methods of determining soil organic matter must be compared [4,5],... [Pg.217]

Bis(benzene)chromium dichromate, 3851 Calcium chromate, 3926 Copper chromate oxide, 4223 Dibismuth dichromium nonaoxide, 0232 Lead chromate, 4243 Lithium chromate, 4236 Magnesium permanganate, 4691 Potassium dichromate, 4248 Potassium permanganate, 4647 Sodium dichromate, 4250 Sodium molybdate, 4713 Sodium permanganate, 4703 Zinc permanganate, 4710... [Pg.249]

Lead chromate oxide see Chromium and chromium compounds) Lead naphthenate see Lead and lead compounds)... [Pg.547]

Finally, it may be noted that the manganese and chromium oxyanions (permanganate and chromate) are known to oxidize alkanes readily (102). In these reactions there is not any direct interaction between the transition metal and the alkane the favored mechanism for chromate oxidation is... [Pg.185]

Copper bis(l-benzeneazothiocarbonyl-2-phenyl-2-hydrazide), 3855 Copper chromate oxide, 4217... [Pg.2068]

Copper chromate oxide, 4217 Dibismuth dichromium nonaoxide, 0232 Lead chromate, 4237 Lithium chromate, 4230 Magnesium permanganate, 4686... [Pg.2441]

Calcium chromate, lead chromate, lead chromate oxide, and zinc chromate chromium(VI)... [Pg.390]

Amongst the monocyclic sesquiterpenes, the plant growth hormone (+)-abscisic acid 446 and a-humulene 451 are found which both can be synthesized by Wittig reactions. To synthesize (+)-abscisinic acid 446 D. L. Roberts et al. 239) converted a-ionone 444 into the allylic alcohol 445 by /-butyl chromate oxidation. 445 is reacted with ethoxycarbonylmethylene-triphenylphosphorane 238 and subsequently... [Pg.140]

Fig. 13.144 (1) sulfonation, (2) chromate oxidation to give the naphthalic anhydride (64), (3) condensation with A-methylamine, and (4) replacement of the sulfonic acid group in a reaction with methoxide. This process gives C.I. Fluorescent Brightener 162. [Pg.586]

Following chromate oxidation, the pulp was divided. One part was further oxidized by soaking the pulp overnight at 2% consistency in chlorous acid. The other portion was reduced by soaking it overnight in a 0.01 M solution of sodium borohydride (SBH). After these treatments, the samples were washed, and handsheets were prepared. [Pg.323]

Figure 6. Rate of homogeneous hydrolysis of cotton cellulose in 81.25% phosphoric acid (D), chromate-oxidized cellulose (O), and SBH-reduced cellulose (R). (Reproduced with permission from Ref. 24. Copyright 1961...

In the chromate oxidation of (-)-)-3-methylheptane to the corresponding tertiary alodiol, there was 70-80% retention of configuration, which is a useful synthetic reactiott Iridium and rudwnium salts also have been shown to catalyze this reaction. ... [Pg.12]

PCC can be modified to show selectivity for the oxidation of allylic alcohols in stnoidal systems. A solution of PCC in dichloromethane with 2% pyridine at ca. 2 C was found to be an effective and selective oxidant (Table 6). In contrast to chromate oxidations of saturated alcohols in rigid systems. Parish and coworkm found that quasiequatorial allylic alcdiols woe oxidized faster than axial ones. Similar xoperties woe also found for solutions of PCC and 3,3-dimethyIpyrazole (2%) in dichloromethane. In addition, Parish and coworkos also eiamined sevoal otho aromatic amines for the ability to promote allylic selectivity. 2,2 -Bipyridine, pyrazine, pyridazine, s-lriazine and 2,4,6-tri diaiy yridine all had S( ne effect, but their cacy tqtpeared to be sutetrate dependent Most recoitly the combination of PCC... [Pg.264]

SYNS BARIUM CHROMATE (1 1) BARIUM CHROMATE OXIDE BARYTA YELLOW CHROMIC ACID, BARIUM SALT (1 1) D C.I, 77103 C.I. PIGMENT YELLOW 31 LEMON CHROME LEMON YELLOW PERMANENT YELLOW STEINBUHL YELLOW ULTRAMARINE YELLOW... [Pg.125]

LEAD CHROMATE OXIDE (ALAK) see LCSOOO LEAD CHROALATE, RED see LCSOOO LEAD CHROALATE, SULPHATE and MOLYBDATE see LDMOOO... [Pg.1747]

Diphenic acid (70-85%) is obtained by acid chromate oxidation of phe-nanthraquinone or phenanthrene. It is unnecessary to isolate or purify the quinone in the latter process. [Pg.215]

When hydrogen peroxide is added to an acidified aqueous solution of a chromate, oxidation occurs and a deep indigo-blue colour results. The reaction is extremely delicate, and may be used as a test for either... [Pg.72]

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