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Organic chemistry cation

Hydrocarbons are divided into two mam classes aliphatic and aromatic This classifi cation dates from the nineteenth century when organic chemistry was devoted almost entirely to the study of materials from natural sources and terms were coined that reflected a substance s origin Two sources were fats and oils and the word aliphatic was derived from the Greek word aleiphar meaning ( fat ) Aromatic hydrocarbons irre spective of their own odor were typically obtained by chemical treatment of pleasant smelling plant extracts... [Pg.57]

This is a well-known reaction in organic chemistry which is favored by the greater stability of the tertiary cation compared to the secondary ion. [Pg.413]

Cationic Surfactants Organic Chemistry, edited by James M. Richmond... [Pg.953]

Although many carbonyl derivatives act as acyl cation equivalents, R(C=0)" in synthetic chemistry, the inherent polarity of the carbonyl group makes it much more difficult to find compounds that will act as equivalents of acyl anions, R(C=0) . Since the 1960s, major progress has been made in this area, and there are now a wide variety of compound types that can react in this way. As in so many areas of organic chemistry, heterocyclic compounds take pride of place and form the basis of many of the most useful methods. In recent years there has been particular interest in developing chiral acyl anion equivalents that will show high... [Pg.89]

Tandem reaction strategies can accomplish several synthetic objectives in a single step.6 The rapidity with which they can build up molecular complexity is a most useful and impressive virtue. For example, cation-induced, biomimetic polyolefinic cyclizations7 are among the most productive and atom-economical8 single-step transformations known in organic chemistry. In one of the most spectac-... [Pg.469]

Blomstrand s formula, which had been largely disregarded, was rediscovered practically simultaneously by Bamberger (1895a) and Hantzsch (1895), who recognized how well it meets the experimental facts. Hantzsch, one of the precursors of physical organic chemistry, also realized the cationic character of these compounds and proposed the present name diazonium ion. [Pg.3]

I will now discuss the development of the elucidation of the dediazoniation mechanism in terms of Kuhn s cycle normal science -> crisis -> revolution -> normal science . After Crossley et al. postulated the aryl cation as key intermediate of dediazoniation in 1940 and the strong support given to that hypothesis in Hammett s book Physical Organic Chemistry (1940), work in the area of dediazoniation... [Pg.215]

In the Brpnsted picture, the acid is a proton donor, but in the Lewis picture the proton itself is the acid since it has a vacant orbital. A Brpnsted acid becomes, in the Lewis picture, the compound that gives up the actual acid. The advantage of Lewis theory is that it correlates the behavior of many more processes. For example, AICI3 and BF3 are Lewis acids because they have only 6 electrons in the outer shell and have room for 8. Both SnCU and SO3 have eight, but their central elements, not being in the first row of the periodic table, have room for 10 or 12. Other Lewis acids are simple cations, like Ag. The simple reaction A + B- A—B is not very common in organic chemistry, but the scope of the Lewis picture is much larger because reactions of the types... [Pg.339]

Uggerud E (2003) Physical Organic Chemistry of the Gas Phase. Reactivity Trends for Organic Cations. 225 1-34... [Pg.239]

The second reason for the lack of early investigations into vinyl cations was the seemingly extreme unreactivity of vinyl halides in solvolytic processes. The unreactivity of vinyl chloride, for instance, even in the presence of silver nitrate, has been almost a legend in organic chemistry (102). This lack of reactivity of simple alkylvinyl halides has been attributed to the low stability of simple vinyl cations or to the very strong carbon-halogen bond, or both. [Pg.243]

Uson, R., Laguna, A. and Arrese, M.L. (1984) A new approach to the synthesis of cationic, neutral or anionic diarylgold(III) complexes. Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry, 14 (4), 557-567. [Pg.175]

Cationic Surfactants Organic Chemistry, edited by James M. Richmond Alkylene Oxides and Their Polymers, F. E. Bailey, Jr, and Joseph V. Koleske Interfacial Phenomena in Petroleum Recovery, edited by Norman R. Morrow Cationic Surfactants Physical Chemistry, edited by Donn N. Rubingh and Paul M. Holland... [Pg.4]

Yoshida, K., Electrooxidation in Organic Chemistry, The Role of Cation Radicals as Synthetic Intermediates, John Wiley Sons, New York, 1984. [Pg.401]

J M Richmond, Cationic surfactants organic chemistry (New York Marcel Dekker, 1990). [Pg.33]


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See also in sourсe #XX -- [ Pg.67 ]




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Organic cations

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