NEUARTIGE ALUMINACYCLOPENTADIENE MIT SPIRO-AT-STRUKTUR UND DEREN VERHALTEN GEGENUEBER NICKEL(0)- UND NICKEL(II)-VERBINDUNGEN

Article abstract of DOI:10.1016/S0022-328X(00)93318-7

Depending on the stoichiometry and solvent conditions aluminacycles III or IV are formed from the reaction of 1,2,3,4-tetraphenyl-1,4-dilithiumbutadiene (I) with AlCl3 (II) (see Scheme 1).It has beens shown that while IV undergoes intramolecular ionic complex formation to give IVa, III gives IIIa only to a smaller extent.III as well as IV take up two (COD)Ni⁰ units forming polynuclear complexes.The proposed structures are discussed.Both III and IV react with NiBr2 to give octaphenylcyclooctatetraene.In the presence of 1,2-bis(diphenylphosphino)ethane (DPPE) the complex DPPE-tetraphenylcyclobutadienenickel(0) can be isolated.