Acetone reaction

Reactions of ketones use acetone reactions (i), (ii), (iii) and (vi) as for aldehydes cycZohexanone oxime (J scale), cycZohexanone phenyl-hydrazone, and acetone semicarbazone (J scale) as in 111,74. ... 

For commercial application, diepoxides such as those derived from bisphenol A are employed, and they are cured via ring-opening crosslinking reactions, into which the epoxy group enters readily. Bisphenol A is so-called because it is formed from two moles of phenol and acetone (Reaction 1.7). 

The activity of both Pd and sulfided Pt catalysts for the synthesis of N-(l,3-dimethylbutyl)-N-phenylamine from aniline and MIBK was lower than that with acetone. This could be attributed to the steric hindrance effect (14). The selectivity over sulfided Pt catalysts was higher compared to unsulfided Pd catalysts due to formation of byproducts as with aniline-acetone reaction. 

From the foregoing degradation scheme for DiPK in the presence of nitroxide, as well as from what we know about DBK photooxidation, it would be expected that the two radicals a and b primarily formed would be captured by oxygen and then give rise to the isobutyryl and isopropyl peroxy radicals c and d. Theoretically, these could interact to form isobutyric acid and acetone (reaction (8)) ... 

Samples of Table 2 were tested for the citral/acetone reaction. The reaction formed essentially pseudoionones and the selectivity to PS was higher than 96 % over all the catalysts during the 6 h catalytic tests. Figure 3 shows the evolution of the relative concentration of citral and the PS yield (tips) as a function of time on Li/MgO-2 and typically illustrates the catalytic behavior of the samples during the reaction. Citral concentration continuously decreases reaching almost complete conversion at the end of the evaluation test while pps value concomitantly increases up to more than 90%. 

Gierczak et al. (1998) have also measured the temperature dependence for the absorption cross sections in addition to the quantum yields as a function of pressure and temperature. They have used these data, combined with the kinetics of the OH-acetone reaction, which is the other major removal process, to calculate the contributions of the OH reactions and of photolysis to the loss of acetone in the atmosphere as a function of altitude. Figure 4.31 shows that photolysis is a significant, but not the major, contributor at the... 

Examples are the formation of diacetone alcohol from acetone [reaction type (A)] catalysed by barium or strontium hydroxide at 20—30°C [368] or by anion exchange resin at 12.5—37.5°C [387], condensation of benzaldehyde with acetophenone [type (C)] catalysed by anion exchangers at 25—-45°C [370] and condensation of furfural with nitromethane [type (D)] over the same type of catalyst [384]. The vapour phase self-condensation of acetaldehyde over sodium carbonate or acetate at 50°C [388], however, was found to be first order with respect to the reactant. 

Bartlett and Trachtenberg have studied the kinetics of Reactions 4.18 and 4.19, and their results provide strong support for this hypothesis.39 When 7,5-dinitro-3-coumaranone (5) reacts with potassium iodide in acetone (Reaction 4.18), the enthalpy of activation is 20 kcal mole-1 higher than when a>-(4-aceto-2,6-dinitro)-phenoxyacetophenone (6) undergoes the analogous reaction (Reaction 4.19). 

The, S n2 reaction between lithium isothiocyanate ion pair and methyl fluoride has been calculated at the MP2(full)/6-31H-G //HF/6-311- -G level of theory in the gas phase and in acetone using the PCM model.108 Both the gas phase and acetone reactions occur with inversion, rather than retention, of configuration. However, the transition states and products are different in the gas phase and in solution methyl thiocyanate is formed in the gas phase by transition state (72) whereas methyl isothiocyanate is formed much more slowly in acetone via the looser transition state (73). 

Tipson108-127 129 by the effective use of degradative procedures, tritylation and tosylation methods, and acetonation reactions. 

In addition to examination of the diacetates, a particularly effective assay technique involves formation of the isopropylidene derivative as described in Figure 4-22. The product, which is obtained in 95-98% yield, is good proof for the presence of a l-(3)-0-alkylglycerol since this acetonation reaction will occur only with vzc-glycol type structures. Thus this would eliminate substitution of an ether bond at the sn-2 position. The isopropylidene derivative can be analyzed by GC and/or GC-MS these techniques reveal excellent patterns, which are very valuable for proof of structure of the ether as such and for... 

The acetaldehyde reaction works well when one drop of dilute sodium hydroxide is added to acetaldehyde. The acetone reaction is best done with insoluble barium hydroxide, Ba(OH)2- Both approaches keep the base concentration low. Without this precaution, the aldol products are not the compounds isolated from the reaction. With more base, further reactions occur, because the aldol products dehydrate rather easily under the reaction conditions to give stable conjugated unsaturated carbonyl compounds. 

Ozonolysis of the s-alkylmercuric halides and the di-s-alkylmercurials produced the coresponding ketone. Although some carbon-carbon cleavage occurred, it was generally less than with the reaction of the primary organomercurials (see Reactions 13 and 14, Table I). In partial contrast to the results of Bockemuller and Pfeuffer (Reaction II), the ozonation of diisopropylmercury yielded acetic acid in addition to acetone (Reaction 14, Table I). 

This provides a valuable diagnostic tool for determination of mechanism. For example, in the bromination of acetone (reaction 12-4)... 

What would be the effect of carrying out the sodium iodide in acetone reaction with the alkyl halides using an iodide solution half as concentrated ... 

With the acetone reaction a further trick is required to ensure that the aldol product does not meet the base. The apparatus is arranged so that, on heating, the volatile acetone is condensed into a vessel containing the insoluble base. The less volatile aldol product is kept away from it. 

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