Reaktionen polyhalogenierter Cyclobutene mit Trimethylphosphit

G e r t B a u e r * u n d G e r h a r d H a g e l e * * A u s dem Inst i tut für Anorganische und Strukturchemie I der Universität Düsseldorf , Universitätsstraße 1, D-4000 Düsseldorf Z. Naturforsch. 34b, 1252-1259 (1979) ; eingegangen a m 3. Apr i l / 10 . Mai 1979 Phosphoranes, Phosphonic A c i d Esters, Synthesis, N M R Structure and reactive behaviour o f polyhalogenated cyclobutenes towards tr imethyl phosphite are studied in detail. Stable phosphoranes RP(F)(OCH3)3 as intermediates o f A r b u z o v t y p e reactions are obtained. Controlled decomposit ion of phosphoranes leads t o highly reactive c-yclobutenyl substituted phosphonic acid esters R P ( 0 ) ( 0 C H 3 ) 2 . Substitut ion reactions at aliphatic and vinyl ic positions o f R P ( 0 ) ( 0 C H 3 ) 2 are observed. Biphosphonic acid esters R[P(0) (0CH3)2]2 are synthesized. Some routes to perhalogenated cyc lo butenes are described. N M R and MS data for the hitherto unknown cyc lobutenyl -substituted organophosphorus c o m p o u n d s are given.