ISSN:
0009-2940
Keywords:
Cobalt(II), (η3-allyl)(η5-pentamethylcyclopentadienyl) complexes
;
Cyclodimerisation and -trimerisation reactions
;
Cycloaddition reactions
;
Allyl-complexes
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Synthesis and Reactivity of (η3-Allyl)(η5-pentamethylcyclopentadienyl)cobalt(II) and its DerivativesReaction of (η5-pentamethylcyclopentadienyl)cobalt(II) chloride (1) with allyllithium- or allylmagnesium compounds leads to new (η3-allyl)(η5-pentamethylcyclopentadienyl)cobalt(II) complexes 2a-d. Complexes 2a reacts with acetonitrile by oxidative addition of a methyl group to cobalt to form 5. With alkynes complexes with cyclodimerisized or -trimerisized alkynes as ligands are formed, e.g. the tetraphenylcyclobutadiene complex 6 from 2a and tolan and the hexamethylbenzene complex 8 from 2a and 2-butyne. Reaction with phenylethyne catalytically leads to triphenylbenzene 10. The complexes 2a-d are oxidized by iodine and bromine to Co(III) iodides 12a-d and bromides 14a and b and by ferricenium tetrafluoroborate to the tetrafluoroborates 13-c. The tetrafluoroborates give with nitriles stable complexes (nitrile-co-ordinated end-on to Co), with alkynes substituted cyclopentadienyl ligands coordinated to Co are formed by cycloaddition of the allyl group and the alkyne.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19931260704
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