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Hydrogen bonding urea bond formation

This tetrakis-urea was expected to self-assemble in apolar media by hydrogen bond formation between urea moieties of two different units. The analogous behavior of calix[4]arene tetrakis-ureas is well documented [75], but, in contrast to the corresponding calix[4]arene capsules, those deriving from 31 would feature hydrogen bond donor sites within the cavity (Fig. 5). [Pg.23]

FIG. 6 J 2 Schematic representation of hydrogen bond formation in monolayers of urea containing amphiphiles 20 at the air/water interface. [Pg.192]

PIC. 6.12 Schematic representation of hydrogen bond formation in monoiayers of urea containing amphiphiies 20 at the alr/water interface. [Pg.192]

Compounds with a strong tendency for hydrogen-bond formation, such as urea, formamide, acetamide, and imidazole... [Pg.120]

In the course of this study, the authors determined /Lvalues for dibenzyl, methyl phenyl, methyl p-nitrophenyl, di-p-tolyl, di-isopropyl and tetramethylene sulphoxides and for diethyl, dipropyl and dibutyl sulphites. The /Lscales are applied to the various reactions or the spectral measurements. The /Lscales have been divided into either family-dependent (FD) types, which means two or more compounds can share the same /Lscale, family-independent (FI) types. Consequently, a variety of /Lscales are now available for various families of the bases, including 29 aldehydes and ketones, 17 carboxylic amides and ureas, 14 carboxylic acids esters, 4 acyl halides, 5 nitriles, 10 ethers, 16 phosphine oxides, 12 sulphinyl compounds, 15 pyridines and pyrimidines, 16 sp3 hybridized amines and 10 alcohols. The enthalpies of formation of the hydrogen bond of 4-fluorophenol with both sulphoxides and phosphine oxides and related derivatives fit the empirical equation 18, where the standard deviation is y = 0.983. Several averaged scales are shown in Table 1588. [Pg.559]


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See also in sourсe #XX -- [ Pg.33 ]




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