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note
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Isolated yield for the previous one-pot method (ref. 5) was 83% and the reaction time was 10 min for the condensation step. The current yield was 78% in ≤6 min for both steps.
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4) only produces small amounts (ca. 20%) of condensation product after 24 h at r.t. when analyzed by TLC. For a recent report on the Knoevenagel condensation of malononitrile with aromatic aldehydes in EtOH without catalyst, see: Wang, X.-S.; Zeng, Z.-S.; Li, Y.-L.; Shi, D.-Q.; Tu, S.-J.; Wei, X.-Y.; Zong, Z.-M. Synth. Commun. 2005, 35, 1915.
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a = 11.1 in DMSO, see: Matthews, W. S.; Bares, J. E.; Bartmess, J. E.; Bordwell, F. G.; Cornforth, F. J.; Drucker, G. E.; Margolin, Z.; McCallum, R. J.; McCollum, G. J.; Vanier, N. R. J. Am. Chem. Soc. 1975, 97, 7006.
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33644513903
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note
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4 was added after 90 min.
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29
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0028356636
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31
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33644513596
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note
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Additional trimethylacetaldehyde was added after 60 min.
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32
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0032480729
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33
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33644509102
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note
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4 was added after 20 min.
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