The complex [Rh(CO)Cl{Me2PC(Me)=C(Me)BMe2}2] (5) has been prepared again in order to prove its structure with weak bonding interactions between the basic rhodium centre and the Lewisacidic Me2B group of the donor/acceptor ligand Me2PC(Me)=C(Me)BMe2 (1). For further investigations additional ligands with P-donor and B-acceptor centres, e. g. Ph2PC(Ph)=C(Ph)BPh2 (2), B(OCH2PMe2)3 (3), and B(CH2CH2PMe2)3 (4), have been prepared and the coordinating properties have been studied by reactions of 1 and 4 with [(π-C5Me5)Rh(CO)2] and Pd(PPh3)4, respectively. Because single crystals of the products [(π-C5Me5)Rh(CO)Me2PC(Me)=C(Me)BMe2] (6), [(π-C5Me5)Rh(CO){Me2PC(Me)=C(Me)BMe2}2] (7) as well as [Pd{B(CH2CH2PMe2)3}] (8) or [(Ph3P)Pd{B(CH2CH2PMe2)3}] (9) could not be generated, quantum chemical calculations have been used to elucidate the coordination geometry expected for 5, 8 and 9. The calculations support the structure of 5 within the expected limitations of the experimental and theoretical methods and - in spite of the extremely soft coordination sphere of 8 and 9 - are in accord with spectroscopic results for the cage structures.
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Grobe et al. (2006) studied this question.