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Preparation of Carbonyl and Fluorocarbonyl Pseudohalides in Molten Salts

✍ Scribed by Dipl.-Chem. W. Verbeek; Priv.-Doz. Dr. W. Sundermeyer

Publisher
John Wiley and Sons
Year
1967
Tongue
English
Weight
205 KB
Volume
6
Category
Article
ISSN
0044-8249

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✦ Synopsis

The behavior of [16]annulene on being warmed and on UV irradiation can be coordinated and understood on the basis of the Woodward-Hoffmann rule [91. hv Structure ( I ) shows great conformational mobility [I].

Equilibration of (1) with ( l a ) is immediately understandable. The electrocyclic reactions of the two cisoid triene systems of ( l a ) are disrotatory in the thermal reaction and conrotatory in the photochemical reaction. The molecule undergoes two electrocyclic reactions in going from ( I n ) to (6c) or from ( l a ) to (6e), and there are two possibilities for the second step: it can be in the same or in the opposite sense relative to the first. The opposing sense is dominant. However, we cannot yet decide whether the electrocyclic reactions of [16]annulene induced thermally or photochemically are synchronous or asynchronous.

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