SF5‐substituierte Ketene

Abstract
SF5‐Substituted KetenesKetenes F5S ‐ CR  C  O [R  H, CH3, C1. Br (2a ‐ d )] are pre‐pared by dehydration from the acids F5S ‐ CHR ‐CO2H (1a‐d), or in the case of R  CH3 (b) also by halogen elimi‐ nation with mercury. These ketenes exhibit remarkable sta‐bility, increasing in the sequence R  H, CH3, C1, Br. They undergo addition reactions across the C  C double bond in known fashion. The isomerization reaction of F5SCH  C  O (2a) to F,SCHCOF is not shown by any of the other ke‐tenes.

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