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1 2006

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Synteza i reaktywność kwasów boranatofosfinawych

Stankevič M., Pietrusiewicz M.

Wiadomości Chemiczne

2006

[Z] 60, 5-6

323-343

Borane complexes of trivalent phosphorus compounds are versatile synthetic intermediates which are especially useful in the elaboration of phosphine structures and in the preparation of chiral phosphine ligands. Despite the synthetic importance and wide use of derivatives of phosphinous acid-boranes such as their esters (phosphinite-boranes), or acid chlorides (.sec-chlorophosphine-boranes), the parent phosphinous acid-boranes have until very recently remained practically unexplored. New developments of convenient and general methods of synthesis of phosphinous acid-boranes from secondary phosphine oxides or from phosphinic chlorides have made them now readily accessible as a novel class of organophosphorus reagents. When nonsymmetrically substituted phosphinous acid-boranes bear a center of chirality at P and are configurationally stable. Phosphinous acid-boranes possess a rich reactivity pattern offering many useful synthetic transformations through the reactions at their R, O, or B, reactivity centers. A large variety of other organophosphorus compounds such as phosphinite-boranes, boranatophosphinous anhydrides and mixed anhydrides, secondary phosphine-boranes, tertiary phosphine-boranes, secondary phosphine oxides, phosphinic halides, and oxaphosphaborolidines, can all be readily derived from phosphinous acid-boranes in a single synthetic operation.