Dinuclear compounds unsymmetrical

Dinitrogen monoxide reductase, 6, 727 Dinuclear compounds symmetrical nomenclature, 1,122 unsymmetrical nomenclature, 1,123 Dioctylamine... 

In spite of the abundant work on synthetic, thermodynamic, structural, and spectroscopic aspects of mixed-valence compounds, the dynamic solution behavior toward external redox reagents has not been much addressed. When such compounds are unsymmetrical and valence-localized, several problems arise when a fully reduced dinuclear complex reacts with an oxidant. Haim pioneered a systematic study performed with different systems reacting with a common two-electron oxidant, peroxydisulfate (126). A relevant example is given by reaction (35) ... 

An interesting range of dinuclear complexes has been reported containing unsymmetrical ligands which rapidly oscillate between the metal atoms. The six compounds 47/ 48/ 49 ( 3) 51 (S4) 52 (85) 53(86) contain a-M-C bonds... 

The mode of reaction of the reduced titanocene species Cp2Ti with disubstituted butadiynes RCC-CCR was reported to depend strongly on the nature of the substituents R and R . For R = R = SiMea the starting butadiyne is split by titanocene to yield the dinuclear complex [ Cp2Ti(CCSiMea) 2]> (43). For other symmetrically substituted (R = R = Ki or Bu ) or unsymmetrically substituted butadiynes (R = SiMea, R = Ph or R = SiMea, R = Bu ) the reaction was reported to proceed to give dinuclear complexes with a central 1,4-disubstituted ii-T (1-3),ti(2-4)-trans, trans-butadiene unit ( zig-zag-butadiyne ) between the two titanium centres. The latter compounds with (R = R = Bu ) and (R = SiMea, R = Ph) were characterised by X-ray diffraction. 

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