Carbyne complex cobalt

As has been demonstrated in Section 3.1.2.4, complexation of amino groups offers a quite different concept for reversible protection. Making use of this principle, the coordination of chromium carbyne complexes with amino acids was described as a new amino protection. Similarly, bis(ethylene-diamine)cobalt(III) complexes of amino acids constitute a new interesting method for protection which recently was extended to the development of a new type of anchoring in solid-phase synthesis (Scheme 69). First, a t-BOC amino acid is condensed with the aquabis(ethylenediamine)cobalt(lII) complex of p-aminomethylbenzoic acid. The handle obtained in this way is then linked to aminomethyl polystyrene to give the anchored amino acid (69). Due to the sufficient stability of the complex toward... 

The running order in this chapter is essentially similar to that used in the preceding one. The main section, dealing with metal-carbon Group VIII triads in the order, iron, cobalt, and nickel, and is followed by a shorter section on carbene and carbyne complexes. Oxidative addition or reductive elimination reactions are included only when they lead directly to the formation or rupture of metal-carbon bonds. 

Complexes Containing Metal-Carbon cr-Bonds of the Groups Iron, Cobalt, and Nickel, Including Carbenes and Carbynes... 

The general format of this chapter is very similar to that used in previous years. The review is restricted to detectable complexes of the iron, cobalt, and nickel triads which contain a metal-carbon o-bond, including carbenes and carbynes. Species postulated in catalytic cycles have normally been excluded and coverage of metal cluster complexes has been kept to a minimum. 

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