Reaktionen polyhalogenierter Cyclobutene mit Trimethylphosphit /Reactions of Polyhalogenated Cyclobutenes with Trimethylphosphite

Abstract

Abstract Structure and reactive behaviour of polyhalogenated cyclobutenes towards trimethyl phosphite are studied in detail. Stable phosphoranes RP(F)(OCH3)3 as intermediates of Arbuzov-type reactions are obtained. Controlled decomposition of phosphoranes leads to highly reactive cyclobutenyl substituted phosphonic acid esters RP(O)(OCH3)2. Substitution reactions at aliphatic and vinylic positions of RP(O)(OCH3)2 are observed. Biphosphonic acid esters R[P(O)(OCH3)2]2 are synthesized. Some routes to perhalogenated cyclobutenes are described. NMR and MS data for the hitherto unknown cyclobutenyl-substituted organophosphorus compounds are given.