ChemInform Abstract: CHARACTERIZATION OF THE ULTRAVIOLET ABSORPTION SPECTRA OF P-SUBSTITUTED DERIVATIVES OF BENZAMIDINE

The half-wave potentials of phenyl substituted derivatives for each series of conjugated heteroenoid compounds studied follow a Hammett relationship. The effect of change in the functional groups and of increase in length of the conjugated system upon half-wave potentials and ultraviolet absorption maxima is briefly discussed. Terephthalylidene derivatives of active methylene compounds function like the cinnamylidene derivatives.

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Ultraviolet absorption spectra of derivatives of symmetric triazine—III The guanyl-melamines

Spectrochimica Acta ◽

10.1016/s0371-1951(59)80395-7 ◽

1959 ◽

Vol 15 ◽

pp. 962-968 ◽

Cited By ~ 6

Author(s):

R.C. Hirt ◽

F. Halverson ◽

F.T. King

Keyword(s):

Absorption Spectra ◽

Ultraviolet Absorption ◽

Derivatives Of

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THE ULTRAVIOLET ABSORPTION SPECTRA OF SOME CARBOXY DERIVATIVES OF NAPHTHALENE

Canadian Journal of Research ◽

10.1139/cjr49b-047 ◽

1949 ◽

Vol 27b (5) ◽

pp. 437-461 ◽

Cited By ~ 22

Author(s):

Y. Hirshberg ◽

R. Norman Jones

Keyword(s):

Dicarboxylic Acid ◽

Absorption Spectra ◽

General Problem ◽

Acid Anhydride ◽

Ultraviolet Absorption ◽

Dioxane Solution ◽

Ethanolic Solution ◽

Complex Molecules ◽

Steric Inhibition Of Resonance ◽

Derivatives Of

The ultraviolet absorption spectra of a variety of naphthalene compounds containing phenyl and carboxy substituents are described. The majority of the compounds contain either the naphthalene-1,2-dicarboxylic acid anhydride or the naphthalene-2,3-dicarboxylic acid anhydride ring systems. It is shown that in ethanolic solution the spectra of these anhydrides change over a period of a few hours. The spectra of the anhydrides in n-heptane or dioxane solution do not change on standing. The effects of the various substituents are discussed in terms of steric inhibition of resonance and of antagonistic and reinforcing actions of the substituents, dependent on the position of substitution. The significance of these data are considered in relation to the general problem of the interpretation of the ultraviolet absorption spectra of complex molecules.

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Functional group and substituent effects, both steric and electronic, upon the ultraviolet absorption spectra of some N-alkyl- and N,N-dialkyl-derivatives of some cinnamamides and benzalcyanoacetamides

Canadian Journal of Chemistry ◽

10.1139/v69-544 ◽

1969 ◽

Vol 47 (17) ◽

pp. 3278-3280 ◽

Cited By ~ 2

Author(s):

A. D. Delaney ◽

D. J. Currie ◽

H. L. Holmes

Keyword(s):

Hydrogen Atom ◽

Absorption Spectra ◽

Functional Group ◽

Substituent Effects ◽

Ultraviolet Absorption ◽

Long Wavelength ◽

Wavelength Absorption ◽

Derivatives Of

Conjugative and steric constants for N-substituted carboxyamide groups have been derived which allow the calculation of the long wavelength absorption maxima of N-alkyl- and N,N-dialkyl-derivatives of cinnamamide and benzalcyanoacetamide. Deviations between calculated and observed values indicate that there may be steric interference between bulky N,N-dialkylcarboxyamide groups and the benzylic hydrogen atom.

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