SOME ALDEHYDES AND KETONES

Equilibrium Constants (AChydr) and Relative Rates of Hydration of Some Aldehydes and Ketones... 

Bell, R.P. and McDougall, A.O. Hydration equilibria of some aldehydes and ketones. Trans. Faraday Soc., 56 1281-1285, 1960. 

The common and lUPAC names of some aldehydes and ketones are given in Table 12.1. 

The structure and 2-ethyl-4-methylpentanal nomenclature of some aldehydes and ketones. 

DNP), oxime, and semicarbazone. Table 31.4 (p. 330) lists some aldehydes and ketones along with melting points of their derivatives. If, for example, we look at the properties of valeraldehyde and crotonaldehyde, though the boiling points are virtually the same, the melting points of the 2,4-DNP, oxime, and semicarbazone are different and provide a basis for identification. 

Bradsher, C.K. 1987. Eormation of six-membered aromatic rings by cychalkylation of some aldehydes and ketones. Chemical Reviews, 87(6) 1277-97. 

Table 19.2 Infrared Absorptions of Some Aldehydes and Ketones Carbonyl type Example...

TABLE 1 Melting Points of Derivatives of Chapter 30 Aldehydes and Ketones Some Aldehydes and Ketones 309... 

Buyske, D.A., L.H. Owen, P. Wilder Jr, and M.E. Hobbs Chromatography of the 2,4-dinitrophenylhydrazones of some aldehydes and ketones in tobacco smoke Anal. Chem. 28(1956)910-913. 

Formation of SIx-Membered Aromatic Rings by Cyclialkylation of Some Aldehydes and Ketones"... 

Lipid oxidation is a major pathway for the formation of volatile compounds in roasted tree nuts. After the enzymes in the nuts (e.g., lipoxygenase) are inactivated by the high temperatures used for roasting, autoxidation becomes the principal source of lipid breakdown [66]. Lipid degradation reactions are not necessarily deleterious to flavor [67], and some aldehydes and ketones (e.g., n-aldehydes and 2-aIkanones) produced during roasting may impart desirable sweet, fruity, and pungent aroma notes to roasted tree nuts. 

Some aldehydes and ketones, those that have a high enol content, give a positive ferric chloride test, as described for phenols in Experiment 52F. 

The path from reactants to products (Scheme 9.65) has been studied in some detail for some of the species G-NH2 and some aldehydes and ketones because... 

Figure 16.4 Some aldehydes and ketones that may be encoutered in the atmosphere.

Phosphonates based on (1), i.e., (PI), can be prepared simply by heating 1,3-dithiole-2-thiones with a trialkyl phosphite at high dilution [215]. They react with aldehydes, ketones, 2-iminium-I,3-dithioles or dithiolium salts and selenium analogs to give larger molecules, precursors of extended tetrachalcogenaftil-valenes (see below). The reactions take place in the presence of a base, such as butyllithium (BuLi) or LDA. Some aldehydes and ketones, which have... 

Aldehydes and ketones often have characteristic and recognizable odors. For example, 2-heptanone is a liquid with a dove-like odor that accounts for the odors of many fruits and dairy products. Some aldehydes and ketones find use as flavoring agents. For example, vanillin, the compound responsible for vanilla flavor, is an aldehyde. Alpha-demascone and 2-octanone are ketones responsible for berry and mushroom flavors, respectively. Butanedione, shown in the margin, is a yellow liquid with a cheese-like smell that gives butter its flavor. 

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