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Generation of reactive cyclopentadienylcobalt(I) derivatives by reduction of dicyclopentadienyldicobalt tetraiodide

Generation of reactive cyclopentadienylcobalt(I) derivatives by reduction of dicyclopentadienyldicobalt tetraiodide

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Prüfsumme: MD5:fa4f6608630b1bac1c5d635fc7b15d61

LEE, Wai-Sun, Hans-Herbert BRINTZINGER, 1981. Generation of reactive cyclopentadienylcobalt(I) derivatives by reduction of dicyclopentadienyldicobalt tetraiodide. In: Journal of Organometallic Chemistry. 209(3), pp. 401-406. ISSN 0022-328X

@article{Lee1981Gener-23953, title={Generation of reactive cyclopentadienylcobalt(I) derivatives by reduction of dicyclopentadienyldicobalt tetraiodide}, year={1981}, doi={10.1016/S0022-328X(00)81196-1}, number={3}, volume={209}, issn={0022-328X}, journal={Journal of Organometallic Chemistry}, pages={401--406}, author={Lee, Wai-Sun and Brintzinger, Hans-Herbert} }

deposit-license Brintzinger, Hans-Herbert Lee, Wai-Sun Journal of Organometallic Chemistry ; 209 (1981), 3. - S. 401-406 2013-09-05T12:33:04Z Brintzinger, Hans-Herbert Lee, Wai-Sun 2013-09-05T12:33:04Z 1981 eng Generation of reactive cyclopentadienylcobalt(I) derivatives by reduction of dicyclopentadienyldicobalt tetraiodide Reduction of [(C<sub>5</sub>H<sub>5</sub>)CoI<sub>2</sub>]<sub>2</sub> by sodium amalgam in toluene in the presence of 1,3-butadiene, 1,3-cyclohexadiene or 1,5-cyclooctadiene affords the corresponding cyclopentadienylcobalt(I) diolefin complexes in high yields. Reduction of [(C<sub>5</sub>H<sub>5</sub>)CoI<sub>2</sub>]<sub>2</sub> in the presence of 2-butyne yields the binuclear metallocyclic compound (C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>Co<sub>2</sub>(C<sub>4</sub>(CH<sub>3</sub>)<sub>4</sub>), previously characterized as a structurally fluxional catalyst for alkyne cyclotrimerisation, as the major product; a trinuclear dicarbyne compound, (C<sub>5</sub>H<sub>5</sub>)<sub>3</sub>Co<sub>3</sub>(C-CH<sub>3</sub>)<sub>2</sub>, is obtained as a minor product. With diphenylacetylene, the analogous phenylcarbyne derivative (C<sub>5</sub>H<sub>5</sub>)<sub>3</sub>Co<sub>3</sub>(C-C<sub>6</sub>H<sub>5</sub>)<sub>2</sub>, previously obtained from thermal reaction with (C<sub>5</sub>H<sub>5</sub>)Co(CO)<sub>2</sub>, is obtained along with the major product, the tetraphenylcyclobutadiene complex (C<sub>5</sub>H<sub>5</sub>)Co(C<sub>4</sub>(C<sub>6</sub>H<sub>5</sub>)<sub>4</sub>). Pathways and intermediates for these reactions are discussed.

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