Upon chlorination with thionyl chloride, the unsymmetrically fluorinated β‐diketones (Ia) which have bulky alkyl substituents give only the Z‐configurated β‐chlorovinyl ketones (III).
Die Poly?uoracylessigsäureester (I) reagieren mit Lawesson Reagens (II) zu den Dithiolenthionen (III), wobei aus den Chlor‐ bzw. Bromessigsäurederivaten (Ib) und (Ic) neben den Verbindungen (IIIb) und (IIIc) auch die Dehalogenierungsprodukte (IIIa) entstehen.
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