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Improved syntheses of symmetrically substituted porphyrins have also been the subject of numerous recent investigations: e.g.
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Improved syntheses of symmetrically substituted porphyrins have also been the subject of numerous recent investigations: e.g. J. S. Lindsey, I. C. Schreiman, H. C. Hsu, P. C. Kearney, A. M. Marguerettaz, J. Org. Chem. 1987, 52, 827;
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Details of our studies on the "3 + 1" methodology were reported at the following meetings: Book of Abstracts, ORGN 177
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Details of our studies on the "3 + 1" methodology were reported at the following meetings: 209th National Meeting of the American Chemical Society, Anaheim, California (USA), April 1995 (T. D. Lash, B. H. Novak, Y. Lin, M. J. Melquist, J. R. Patel, Book of Abstracts, ORGN 177);
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Book of Abstracts, ORGN 179. This work was supported by the National Science Foundation under Grant No. CHE-9500630 and the Donors of the Petroleum Research Fund, administered by the American Chemical Society
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210th National Meeting of the American Chemical Society, Chicago, Illinois, (USA). August 1995 (T. D. Lash, Y. Lin, Book of Abstracts, ORGN 179). This work was supported by the National Science Foundation under Grant No. CHE-9500630 and the Donors of the Petroleum Research Fund, administered by the American Chemical Society.
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210th National Meeting of the American Chemical Society, Chicago, Illinois, (USA). August 1995
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A report on the synthesis of a "mono-hook" porphyrin by the "3 + 1" approach was published recently: These authors noted that the acid-catalyzed condensation of diformyltripyrranes with 3,4-diethylpyrrole failed to give any porphyrin products. As the initial condensation is likely to afford an electron-deficient pyrromethene unit that would be unable to react with a second pyrrole aldehyde moiety, this factor presumably prevents porphyrin formation
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A report on the synthesis of a "mono-hook" porphyrin by the "3 + 1" approach was published recently: J. L. Sessler, J. W. Genge, A. Urbach, P. Sanson, Synlett 1996, 187. These authors noted that the acid-catalyzed condensation of diformyltripyrranes with 3,4-diethylpyrrole failed to give any porphyrin products. As the initial condensation is likely to afford an electron-deficient pyrromethene unit that would be unable to react with a second pyrrole aldehyde moiety, this factor presumably prevents porphyrin formation.
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