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Die Stereochemie der fragmentierenden Enthalogenierung von 1-Chlor-1-fluor-2-(1-halogenalkyl)cyclopropanen

✍ Scribed by Bojana Spahić; Manfred Schlosser


Book ID
102858493
Publisher
John Wiley and Sons
Year
1980
Tongue
German
Weight
876 KB
Volume
63
Category
Article
ISSN
0018-019X

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✦ Synopsis


The Stereochemistry of the Fragmentative Dehalogenation of 1‐Chloro‐1‐fluoro‐2‐(1‐halogenalkyl)cyclopropanes

A number of model substrates were submitted to zinc‐promoted fragmentation, and the composition of the resulting mixture of isomeric fluorodienes was determined. The exocyclic reaction center, bearing the electrofugal leaving group, was found to undergo almost complete stereochemical randomization in the course of the reaction. On the other hand, the ring‐opening proceeds stereoselectively. The rotation, which brings the substitutents of the halogen‐free ring position into the plane of the new, fluorine‐bearing double‐bond, occurs mainly in that sense to move the electrons of the breaking ring linkage into the rear of the departing chlorine atom.


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