On the superimposability of the electronic spectra of disubstituted benzene derivatives in the interpretation of the principal absorption bands of certain trisubstituted derivatives

2010 ◽  
Vol 82 (4) ◽  
pp. 361-369
Author(s):  
R. F. Rekker ◽  
W. Th. Nauta
Keyword(s):  
Electronic Spectra ◽  
Benzene Derivatives ◽  
Absorption Bands ◽  
Disubstituted Benzene

Coefficients of molecular homeomorphism and crystalline isomorphism in the series of para-disubstituted benzene derivatives

1991 ◽  
Vol 88 ◽  
pp. 509-514 ◽  
Author(s):  
MA Cuevas Diarte ◽  
T Calvet ◽  
M Labrador ◽  
E Estop ◽  
HAJ Oonk ◽  
...  
Keyword(s):  
Benzene Derivatives ◽  
Disubstituted Benzene

scholarly journals Macrocyclization Using RCM Reactions. Synthesis of Simple Metacyclophanes and Synthetic Efforts toward Platycarynol, a 15-Membered Aromatic Ether

2016 ◽  
Vol 11 (8) ◽  
pp. 1934578X1601100
Author(s):  
Katsuyuki Nakashima ◽  
Hatsuna Matsunaga ◽  
Masako Ito ◽  
Hiroshi Minami ◽  
Akihito Aiba ◽  
...  
Keyword(s):  
Ground State ◽  
Diphenyl Ether ◽  
Benzene Derivatives ◽  
Disubstituted Benzene ◽  
Aromatic Ether

Preparation of 13- to 19-membered carbocycles (metacyclophanes) from 1,3-disubstituted benzene derivatives has been successfully carried out using the RCM reaction, but similar starting materials having diphenyl ether did not cyclize to 15-membered compounds, whose ground state conformations were calculated and discussed. Several attempts to cyclize to form platycarynol are described.

Dihydronaphthalenone Carboxylates - Spectral Characteristics and Structure

1997 ◽  
Vol 52 (5) ◽  
pp. 457-461 ◽  
Author(s):  
Sn. Bakalova ◽  
A. Georgieva ◽  
P. Nikolov ◽  
E. Stanoeva
Keyword(s):  
Ir Spectra ◽  
Quantum Chemical Calculations ◽  
Electronic Spectra ◽  
Quantum Chemical ◽  
Substituent Effect ◽  
Methyl Esters ◽  
Spectral Characteristics ◽  
Absorption Bands ◽  
Tautomeric Forms ◽  
Luminescence Characteristics

Abstract The absorption and luminescence characteristics of a group of newly synthesized methyl esters of 2-alkyl (p-substituted-aryl) -aminomethylene-3,4-dihydro-1(2 H)-naphthalenone-4-carboxylic acids have been investigated. The studied compounds may exist in three tautomeric forms. On the basis of comparison of their electronic spectra to those of similar substances, the observed substituent effect on the position of the UV-VIS absorption bands, the IR spectra and the results of PPP-SCF-CI quantum-chemical calculations it is concluded that the keto tautomer predominates in solution.

Ring openings of γ- and δ-lactones to form γ- and δ-hydroxyamides. Cyclodehydration. Mass spectra of δ-hydroxyamides

1969 ◽  
Vol 47 (19) ◽  
pp. 3671-3676 ◽  
Author(s):  
Earl M. Levi ◽  
Chung-Ling Mao ◽  
Charles R. Hauser
Keyword(s):  
Mass Spectrometry ◽  
Sulfuric Acid ◽  
Mass Spectra ◽  
Benzene Derivatives ◽  
Ortho Effect ◽  
Disubstituted Benzene

Ring openings of γ- and δ-lactones were effected with potassium amide or hydrazine to form γ- and δ-hydroxyamides, which were cyclodehydrated with sulfuric acid to give γ- and δ-lactams, respectively. These products are, respectively, phthalimidines and 3,4-dihydroisocarbostyrils having no substituent on nitrogen or having the N—NH2 group. The possible linear dehydration of the δ-hydroxyamides was not observed. The δ-hydroxyamides exhibited, on mass spectrometry, a type of carbon–carbon cleavage that has apparently not been reported for ordinary alcohols. An example of the "ortho effect" in mass spectra of o-disubstituted benzene derivatives is also discussed.

LIGHT ABSORPTION STUDIES: PART XII. ULTRAVIOLET ABSORPTION SPECTRA OF BENZALDEHYDES

1958 ◽  
Vol 36 (10) ◽  
pp. 1362-1370 ◽  
Author(s):  
J. C. Dearden ◽  
W. F. Forbes
Keyword(s):  
Absorption Spectra ◽  
Light Absorption ◽  
Electronic Spectra ◽  
Spectral Properties ◽  
Ultraviolet Absorption ◽  
Benzene Derivatives ◽  
Formyl Group ◽  
Steric Interactions ◽  
Absorption Studies ◽  
Acetyl Group

The electronic spectra of benzaldehydes in the region 220–360 mμ are recorded and discussed in terms of previously stated hypotheses. The formyl group is shown to endow benzene derivatives with spectral properties similar to those of the acetyl group in acetophenones, except that steric interactions are slightly modified.

The electronic spectra of osmium and ruthenium tetroxides

1967 ◽  
Vol 20 (11) ◽  
pp. 2315 ◽  
Author(s):  
EJ Wells ◽  
AD Jordan ◽  
DS Alderdice ◽  
IG Ross
Keyword(s):  
Electronic Spectra ◽  
Detailed Structure ◽  
Absorption Bands ◽  
Forbidden Transitions

The spectrum of OsO4 has been measured in the vapour and in solution. Detailed structure reported in the main absorption bands by Langseth and Qviller was not reproduced. The irregularity of the main intervals between peaks, and their sensitivity to temperature, bespeak a perturbed spectrum which is too diffuse to analyse convincingly. Three fragmentary systems of quite different appearance were observed in all samples and could well be weak forbidden transitions. The spectrum of RuO, vapour is no better resolved. Reproducible features of both spectra are tabulated.

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