Manganese complexes acetylides

Additional developments in the synthesis of enediyne motifs, beyond the now well-established Pd-catalyzed routes, have recently been reported. Casey et al. (377, 399) demonstrated that cw-enediyne complexes can be readily obtained via dimerization of Cp(CO)2Re-aIkynylcarbene complexes at 100°C (cf. Fig. 27), as well as from the addition of a,oc)-diynes to manganese carbyne complexes that rearrange to enediynes below room temperature. In parallel, Cummins and co-workers have demonstrated that sequential reductive coupling of Mo(IV) acetylides and alkyne metathesis can also be used as a novel route to both ( )- and (Z)-enediyne constructs (523). 

Manganese(tl) complexes,, 3, 9-82 acctylacetonates, 48 acetylides, 14 alcohols, 37 alkoxides, 37 alkyl phosphines, 13 alkyls, 12 amides, 15, 16 amine oxides, 39 amines, 16 amino acids, 43, 62 sulfur containing, 70 ammines, 15 antimony ligands, 31-34 arsenates, 4,5, 46 arsenic ligands, 31-34 arsenic oxides, 39 aryls, 12, 14 azides, 22 binary alkyls, 13 bipyridyl, 24, 25 anions, 25... 

The acetylide ligand differs from cyanide in forming the cobalt complex M4[Co(C=CR)6] and the tetraco-ordinated manganese(II) complex anion [Mn(C CR)4]. Further, whereas complex cyanides of copper [Cu(CN)J-( - ), where x = 2, 3 or 4, are known, the corresponding complex acet de where n = 4 is unknown. 

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