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The efficiency of the 2-oxazoline system as a protecting group for the sterically hindered carboxyl function is demonstrated in the case of Grignard-reactions of certain organophosphorus compounds. Thereby, organophosphorus species with an o-carboxyphenyl group are easily accessible. Additionally, the enantiomer separation of an unsymmetrically substituted tertiary phosphine oxide with an o-carboxyphenyl group is described.

zeitschrift für naturforschung b

Das 2-Oxazolinsystem als Schutzgruppe für die sterisch gehinderte Carboxylfunktion bei Grignard-Reaktionen: Synthese phosphororganischer Verbindungen mit einem o-Carboxyphenylrest / The 2-Oxazoline System as a Protecting Group for the Sterically Hindered Carboxyl Function in Grignard-Reactions: The Synthesis of Organophosphorus Compounds with an o-Carboxyphenyl Rest