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Untersuchungen in der Benztropylium-Reihe. IV. Die Bildungsenthalpien des 2,7-Dimethyl-4,5-benztropons, des 2,7-Dodecamethylen-4,5-benztropons und des 2,7-Pentamethylen-4,5-benztropons

✍ Scribed by R. W. Schmid; Else Kloster-Jensen; E. Kováts; E. Heilbronner

Publisher
John Wiley and Sons
Year
1956
Tongue
German
Weight
427 KB
Volume
39
Category
Article
ISSN
0018-019X

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✦ Synopsis

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 to I and II is due to the steric inhibition of coplanarity of the 4,5‐benzo‐tropone‐system in III.

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