Metallorganische Verbindungen der Lanthanoide, 91^[1] Carben‐Addukte des zweiwertigen Samariums und Ytterbiums

Abstract

Organometallic Compounds of the Lanthanides, 91 [1] . ‐ Carbene Complexes of Divalent Samarium and Ytterbium (Imidazol‐2‐ylidene)lanthanide adducts (C 5 Me 4 Et) 2 Sm–CN‐( i Pr)CMeCMeN( i Pr) ( 5b ), (C 5 Me 5 ) 2 Yb–CN(Me)CMeCMeN(Me) ( 6a ), (C 5 Me 5 ) 2 Yb–CN( i Pr)CMeCMeN( i Pr) ( 6b ), and (C 5 H 3 t Bu 2 ) 2 Yb–CN(Me)CMeCMeN(Me) ( 7a ) are obtained from 1,3,4,5‐tetramethyl‐imidazol‐2‐ylidene ( 4a ) or 1,4‐diisopropyl‐2,3‐dimethylimidazol‐2‐ylidene ( 4b ) and (C 5 Me 4 Et) 2 Sm(THF) ( 1 ), (C 5 Me 5 ) 2 Yb(THF) ( 2 ), or (C 5 H 3 ‐ t Bu 2 ) 2 Yb(THF) ( 3 ). The molecular structure of the ytterbium carbene complex 7a has been determined by X‐ray diffraction.