Reactions of (-)-sparteine with alkali metal HMDS complexes: conventional meets the unconventional.

Natalie M Clark, Pablo García-Alvarez, Alan R Kennedy, Charles T O'Hara, Gemma M Robertson

Index: Chem. Commun. (Camb.) (39) , 5835-7, (2009)

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Abstract

'Conventional' (-)-sparteine adducts of lithium and sodium 1,1,1,3,3,3-hexamethyldisilazide (HMDS) were prepared and characterised, along with an unexpected and 'unconventional' hydroxyl-incorporated sodium sodiate, [(-)-sparteine x Na(mu-HMDS)Na x (-)-sparteine](+)[Na(4)(mu-HMDS)(4)(OH)](-)--the complex anion of which is the first inverse crown ether anion.