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Synlett 2022; 33(01): 34-37
DOI: 10.1055/a-1659-7656
DOI: 10.1055/a-1659-7656
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Bis(η5-cyclopentadienyl)[μ-(4b,5,5a-η3:9b,10,10a-η3)-2,3,7,8-tetrakis(trimethylsilyl)benzo[3,4]cyclobuta[1,2-b]biphenylene]-syn-dicobalt (Co–Co), a Dinuclear π-Complex of the Linear [3]Phenylene Framework
We are grateful to the National Science Foundation (CHE-0907800 to K.P.C.V. and CHF-1764328 to K.N.H.) for financial support. Calculations were performed on the Hoffman2 cluster at the University of California, Los Angeles, and in the Extreme Science and Engineering Discovery Environment (XSEDE), which is funded by the National Science Foundation (Grant OCI-1053575).
Abstract
The title compound was made by the reaction of the CpCo-complex of 2,3,7,8-tetrakis(trimethylsilyl) linear [3]phenylene, in which the metal coordinates one of the cyclobutadiene rings, with CpCo(C2H4)2. Because of its relative stability, a syn-dicobalt-bound configuration is indicated rather than its anti alternative.
Supporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-1659-7656.
- Supporting Information
Publication History
Received: 03 September 2021
Accepted after revision: 01 October 2021
Accepted Manuscript online:
01 October 2021
Article published online:
14 October 2021
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2,3,7,8-Tetrakis(trimethylsilyl) linear [3]phenylene(CpCo)2 6In a glovebox, 2,3,7,8-tetrakis(trimethylsilyl) linear [3]phenylene(CpCo) 1 (85 mg, 0.133 mmol) and CpCo(C2H4)2 (25 mg, 0.139 mmol) were added to a Schlenk flask. The flask was taken out of the
glove box, and freshly distilled degassed benzene (15 mL) was added under N2. The mixture was heated to 70 °C in an oil bath for 23 h and then cooled to r.t.
The solvent was removed in vacuo, furnishing a black residue that was filtered rapidly
through a plug of neutral alumina (activity III; 2.5 × 3.5 cm), eluting with hexanes–THF
(100:1) under N2. The solvents were again removed in vacuo, and the ensuing black residue was crystallized
from acetone–EtOAc (100:1) at –78 °C to give reddish-black crystals; yield: 57 mg
(56%). 1H NMR (400 MHz, acetone-d
6): δ = 7.36 (s, 4 H), 4.89 (m, 4 H), 4.81 (s, 2 H), 0.39 (s, 36 H). 13C NMR (100 MHz, acetone-d
6): δ = 150.5, 145.4, 125.9, 82.8, 57.1, 53.7, 2.66. MS (FAB): m/z = 762 ([M+]). HRMS (EI, 70 eV): m/z [M+] calcd for C40H52Co2Si4: 762.1810; found: 762.1791. UV/Vis (hexane): λmax (log ε) = 221 (3.36, sh), 244 (3.44), 286 (3.63), 386 (2.79, sh), 439 nm (2.58).
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