Cobalt, chloropentaammine

Purpureocobalt — see Cobalt, chloropentaammine-Purpureocobaltic chloride —see Cobalt, chloropentaammine-, chloride Pyridine, 2-hydroxy-5-methyl-dodecacobalt complexes, 168 Pyridine complexes linkage isomers, 186 Pyrimidine complexes... 

A consequence of the addition of coordinated OH- to alkenes is that other nucleophilies, for example a coordinated aminate ion, should also be active. This type of reaction is seen with the chloropentaammine complex [Co(NH3)500CCH=CHC02Bu,]2+ in aqueous base533 (Scheme 49). The reaction of the f-butyl maleate complex occurs to the extent of ca. 50% and is complicated by hydrolysis of the maleate ester and some decomposition of the cobalt(III) complexes. Reactions of this type have recently been exploited in the synthesis of j3-carboxyaspartic acid in the coordination sphere of cobalt(III).53... 

The black chloride is a lustrous crystalline solid. It is stable when perfectly dry. It cannot be dissolved in w ater (even at 0°) without decomposition to yield basic cobalt(II) chlorides. Treatment with concentrated hydrochloric acid yields [CoCU] " in solution, and neither the red isomer nor the chloropentaammine chloride can be obtained. If air is allowed to come in contact with basic solutions of the compound, oxidation to cobalt (III) ammines occurs. Treatment with concentrated ammonia solution (in a nitrogen atmosphere) sdelds [Co(NH3)6]. ... 

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