Isolation and structure of the anti,anti isomer and a DFT study of it and the syn,anti isomer of bis(tricarbonylchromium)dibenzo-[a,e]cyclooctatetraene. Evidence for an attractive electrostatic interaction between carbonyl oxygen atoms and Cr(CO)3-coordinated arene carbon atoms

Bandara, Nilantha; Ratnaweera, Chinthaka N.; Gwaltney, Steven R.; Henry, William P.

doi:10.1016/j.jorganchem.2013.06.029

Cited by 3 publications

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Alkynyldicobalt Derivatives of Dibenzosuberenol and Dibenzocyclooctatrien‐5‐ol: Ring Conformations, Ease of Carbonyl Elimination and Relevance to Pauson–Khand Cyclization

et al. 2017

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Under very mild conditions, (5-alkynyl-5H-dibenzo-[a,d]cycloheptatrien-5-ol)Co 2 (CO) 6 clusters 1 lose a carbon monoxide ligand and form the corresponding η 2 -alkene-μ-alkyne-Co 2 (CO) 5 complexes 2 (the first isolated examples of the initial phase of the Pauson-Khand reaction). This behaviour is not paralleled by the homologue in which an additional methylene group has been inserted within the seven-membered ring, as in the [5-alkynyl-6H-dibenzo[a,e]cyclooctatrienol]Co 2 -(CO) 6 system 8, for which several X-ray crystal structures are reported. The apparent additional flexibility of this molecular framework does not translate into conformations appropriate for the formation of η 2 -alkene-μ-alkyne-Co 2 (CO) 5 complexes. The relative inertness of the ethynyl complex 1a, compared [a] 2051 ing of the seven-membered ring towards the cluster, such that this distance, d, shortens to 2.04 Å. In contrast, in the eightmembered ring complex 8a, not only is the corresponding bond-centroid-to-cobalt distance, d, considerably longer (ca. 4.2 Å), but the C11=C12 double bond is also twisted away from the horizontal, as depicted in Figure 6b.

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Alkynyldicobalt Derivatives of Dibenzosuberenol and Dibenzocyclooctatrien‐5‐ol: Ring Conformations, Ease of Carbonyl Elimination and Relevance to Pauson–Khand Cyclization

et al. 2017

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Cyclic and Non-cyclic Pi Complexes of Chromium

Song

2022

Comprehensive Organometallic Chemistry IV

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Two-Fold Reduction of Dibenzo[a,e]cyclooctatetraene with Group 1 Metals: From Lithium to Cesium

et al. 2020

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Chemical reduction of sym-dibenzo[a,e]cyclooctatetraene (DBCOT, 1) has been investigated using group 1 metals ranging from Li to Cs as the reducing agents. With all alkali metals, DBCOT readily undergoes a 2-fold reduction to afford the doubly reduced DBCOT2– (1 2–) anion. Seven products of 1 2– with different alkali-metal counterions have been isolated and fully characterized. Their X-ray diffraction structural analyses reveal the ligand core planarization upon addition of two electrons as well as the versatility of 1 2– in alkali-metal coordination. The negative charge localization at the central eight-membered ring of 1 2– identified by theoretical calculations is fully consistent with the X-ray crystallographic and NMR spectroscopic results. A broad range of solid-state structural arrangements of the resulting products stems from different metal binding patterns and secondary interactions involving coordinating agents used for crystallization (THF vs 18-crown-6 and [2.2.2]cryptand). This family of alkali-metal salts of 1 2– provides useful reagents for ligand metathesis reactions that can be used in the preparation of various transition-metal or lanthanide-based organometallic complexes.

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Isolation and structure of the anti,anti isomer and a DFT study of it and the syn,anti isomer of bis(tricarbonylchromium)dibenzo-[a,e]cyclooctatetraene. Evidence for an attractive electrostatic interaction between carbonyl oxygen atoms and Cr(CO)3-coordinated arene carbon atoms

Cited by 3 publications

References 45 publications

Alkynyldicobalt Derivatives of Dibenzosuberenol and Dibenzocyclooctatrien‐5‐ol: Ring Conformations, Ease of Carbonyl Elimination and Relevance to Pauson–Khand Cyclization

Alkynyldicobalt Derivatives of Dibenzosuberenol and Dibenzocyclooctatrien‐5‐ol: Ring Conformations, Ease of Carbonyl Elimination and Relevance to Pauson–Khand Cyclization

Cyclic and Non-cyclic Pi Complexes of Chromium

Two-Fold Reduction of Dibenzo[a,e]cyclooctatetraene with Group 1 Metals: From Lithium to Cesium

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