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Glyoxal, conformation

We can extend the above theoretical approach to isoconjugate molecules such as acrolein and glyoxal. Arguing as before, we conclude that the relative order of conformational stability will be gauche > tram > cis if pi nonbonded interactions dictate the preferred conformation, cis > gauche > trans if sigma interactions are dominant, and trans > gauche > cis if steric effects are the most important factor. [Pg.103]

In the case of glyoxal, the cis conformer has been detected but, as of now, no stable gnuc/ie-conformation has been found. [Pg.103]

The results of ab initio calculations of glyoxal and acrolein are shown in Table 20. The low cis-trans energy difference in acrolein may be a result of hydrogen bonding which obtains only in the cis conformation as illustrated below ... [Pg.103]

Table 20. Computed relative energies of the cis and trans conformations of glyoxal and acrolein... Table 20. Computed relative energies of the cis and trans conformations of glyoxal and acrolein...
Scheme 11 3-CR synthesis of ketopiperazines using ethyl glyoxalate and two representative 3D conformations of 65A (cyan) and 65B (blue). Yield shown represents yield over all steps... Scheme 11 3-CR synthesis of ketopiperazines using ethyl glyoxalate and two representative 3D conformations of 65A (cyan) and 65B (blue). Yield shown represents yield over all steps...
Ramalingam, M., Venuvanalingam, P., Swaminathan, J., and Buemi, G., Ab initio and DFT studies on conformations, hydrogen bonding and electronic structures of glyoxal-monoxime and its methyl derivatives, J. Mol Struct. Theochem, 712, 175-185 (2004). [Pg.101]

The structure of the unusual caged hydrocarbon Binor-S has been established by an analysis of the dione derivative (88), The valence angles in the nortricyclanone subunits indicate considerable strain [e.g. C(l)-C(7)-C(4) 101.3°], and the six- and eight-membered rings are both in boat conformations. The reaction of ethylenediamine and glyoxal has been shown to produce the heterocyclic cage compound (89) " in which the two... [Pg.317]


See other pages where Glyoxal, conformation is mentioned: [Pg.1046]    [Pg.1737]    [Pg.315]    [Pg.374]    [Pg.93]    [Pg.69]    [Pg.647]    [Pg.202]    [Pg.315]    [Pg.84]    [Pg.196]    [Pg.349]    [Pg.107]    [Pg.720]    [Pg.174]    [Pg.148]    [Pg.341]    [Pg.211]    [Pg.1602]   
See also in sourсe #XX -- [ Pg.69 ]

See also in sourсe #XX -- [ Pg.84 ]




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