## Abstract The dipole moments of symmetrically substituted 2,7‐dialkyl‐4,5‐benztropones have been determined; their dependance on the type of alkyl groups (alkyl = methyl, ethyl, propyl, hexyl, iso‐propyl, tert.‐butyl) is discussed.
Untersuchungen in der Benztropylium-Reihe IX. Die Absorptions-Spektren der 2-Alkyl-4,5-benztropone, 2,7-Dialkyl-4,5-benztropone und 5,7-Dialkyl-2,3-benztropone
✍ Scribed by Doris Meuche; Hansruedi Strauss; E. Heilbronner
- Publisher
- John Wiley and Sons
- Year
- 1958
- Tongue
- German
- Weight
- 554 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
The preparation and the absorption spectra of 2‐alkyl‐ and 2,7‐dialkyl‐4,5‐benztropones (with alkyl = methyl, ethyl, propyl, hexyl, iso‐propyl and tert.‐butyl), and of 5,7‐dialkyl‐2,3‐benztropones (with alkyl = methyl and ethyl) are described.
📜 SIMILAR VOLUMES
## Abstract The dipole moments of 2,3‐benztropone (11), 4,5‐benztropone (III) and of 2,7 dialkyl‐substituted 4,5‐benztropones have been determined. The difference in dipole moment between II and III can be attributed to differences in geometry, rather than to varying amounts of polar character. Att
## Abstract The polarographic half wave potentials of 2,3‐benztropone, 4,5‐benztropone, 2,7‐dimethyl‐4,5‐benztropone and 2,7‐polymethylene‐ 4,5‐benztropones have been determined. The half wave potentials of the latter series of compounds support the conclusions drawn in previous publications concer
## Abstract The enthalpies of formation of 2,7‐dimethyl‐4,5‐benzotropone (I), 2,7 ‐ pentamethylene‐ 4,5 ‐ benzotropone (III) and 2,7 ‐ dodeca‐methylene‐ 4,5‐benzotropone (II) have been determined by combustion calorimetric methods. The loss of 36 kcal/moles in delocalisation energy for III relative
## Abstract The UV, spectra and the polarizationof the individual absorption bands have been measured for tropone, 2,7‐dimethyl‐4, 5‐benzotropone and 2, 7‐dimethyl‐4, 5‐naphtotropone. The positions, relative intensities and polarizations of these bands predicted by a simplified version of the PPP‐m
## Abstract Das aus Cyclooctatetraen und Acetylendicarbonsäuremethylester dargestellte Addukt V gibt durch DIELS‐ALDER‐Synthese mit 2.5‐Diphenyl‐3.4‐benzofuran (I) das Addukt VI, welches durch Wasserabspaltung in das Naphthocyclobuten‐Derivat VII verwandelt wird. Das durch thermische Zersetzung von