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Volumn 36, Issue 23, 1997, Pages 2609-2612

Octaethyltetraselenaporphyrin dication

Author keywords

Aromaticity; Heterocycles; Macrocycles; Porphyrinoids; Selenium

Indexed keywords


EID: 0031574005     PISSN: 05700833     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.199726091     Document Type: Article
Times cited : (25)

References (48)
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    • There are a number of reports on mono- and dithiaporphyrins as well as diselenaporphyrins: a) M. J. Broadhurst, R. Grigg, A. W. Johnson, J. Chem. Soc. C 1971, 3681; b) A. Ulman, J. Manassen, J. Am. Chem. Soc. 1975, 97, 6540; c) A. Ulman, J. Manassen, F. Frolow, D. Rabinovich, ibid. 1979, 101, 7055; d) R. L. Hill, M. Gouterman, A. Ulman, Inorg. Chem. 1982, 21, 1450.
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    • There are a number of reports on mono- and dithiaporphyrins as well as diselenaporphyrins: a) M. J. Broadhurst, R. Grigg, A. W. Johnson, J. Chem. Soc. C 1971, 3681; b) A. Ulman, J. Manassen, J. Am. Chem. Soc. 1975, 97, 6540; c) A. Ulman, J. Manassen, F. Frolow, D. Rabinovich, ibid. 1979, 101, 7055; d) R. L. Hill, M. Gouterman, A. Ulman, Inorg. Chem. 1982, 21, 1450.
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    • For the coordination chemistry of monothia- and monoselenaporphyrins see: e) L. Latos-Grażyński, J. Lisowski, M. M. Olmstead, A. L. Batch, J. Am. Chem. Soc. 1987, 109, 4428; f) Inorg. Chem. 1989, 28, 1183; g) R. P. Pandian, T. K. Chandrashekar, J. Chem. Soc. Dalton Trans. 1993, 119; h) M. Ravikanth, T. K. Chandrashekar, Struct. Bonding (Berlin) 1995, 82, 105; i) L. Latos-Grażyński, E. Pacholska, P. J. Chmielewski, M. M. Olmstead, A. L. Balch, Inorg. Chem. 1996, 35, 566; j) a monoselenasapphyrin was reported by J. Lisowski, J. L. Sessler, V. Lynch, Inorg. Chem. 1995, 34, 3567.
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    • [5] Despite the advances in the chemistry of tellurium (see N. Petragnani, Tellurium in Organic Syntheses, Academic Press, London, 1994), the synthetic route to the tellurium analogue of 4, 5, and 6 still appears to be strewn with difficulties.
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    • 4 in THF, 1 h, 25°C; 7 precipitated from n-hexane as a colorless, mother-of-pearl-like solid, m.p. 21°C (yield 94%)
    • 4 in THF, 1 h, 25°C; 7 precipitated from n-hexane as a colorless, mother-of-pearl-like solid, m.p. 21°C (yield 94%).
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    • note
    • The compounds 8 and 9 were identified on the basis of their characteristic violet color, which appeared on the thin layer chromatograms [n-hexane/ toluene (4/1)] after treatment with nitric acid vapor (the color of the first fraction disappeared after a short time).
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    • Calculated from the relevant bond angles for thiophene and selenophene given in C. W. Bird, G. W. H. Cheeseman in Comprehensive Heterocyclic Chemistry, Vol. 4, Part 3 (Eds.: A. R. Katritzky, C. W. Rees), Pergamon, Oxford, 1984, p. 3.
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    • note
    • 1/2. Programs used: MolEN (Enraf-Nonius) for structure determination and SHELXL-93 (G. M. Sheldrick, University of Göttingen) for refinement. Calculations were carried out at the Regionales Rechenzentrum der Universität Köln. The crystallographic data (excluding structure factors) for the structures reported in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication no. CCDC-100-118. Copies of the data can be obtained free of charge on application to The Director, CCDC, 12 Union Road, Cambridge, CB21EZ, UK (fax: Int code +(1223)336-033; e-mail: deposit@chemcrys.cam.ac.uk).
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    • Cyclovoltammetric studies on 6 indicate two reduction waves, which in terms of the electron transitions cannot be interpreted unambiguously because of the strong broadening
    • Cyclovoltammetric studies on 6 indicate two reduction waves, which in terms of the electron transitions cannot be interpreted unambiguously because of the strong broadening.
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    • The reduction took place under an inert atmosphere in a reaction flask that was connected through a frit to a NMR tube
    • The reduction took place under an inert atmosphere in a reaction flask that was connected through a frit to a NMR tube.
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    • The fairly good correlation of experimental and calculated Δδ values is astonishing, because the possibility that the heteroatoms in both 6 and 11 could carry charge was not taken into consideration
    • The fairly good correlation of experimental and calculated Δδ values is astonishing, because the possibility that the heteroatoms in both 6 and 11 could carry charge was not taken into consideration.


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