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34248517292
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X-ray structures of diaryl squaramides reveal the N-N distance to be 3.3 Å see ref 3
-
X-ray structures of diaryl squaramides reveal the N-N distance to be 3.3 Å (see ref 3).
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39
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34248557688
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The poor solubility of 1a in dioxane or toluene restricted us to DMF.
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The poor solubility of 1a in dioxane or toluene restricted us to DMF.
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34248507021
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Squaramides could be highly acidic for reasons similar to that of squaric acid (see: Smith M. B.; March J. March's Advanced Organic Chemistry, 5th ed.; Wiley-Interscience: New York, 2001; p 70).
-
Squaramides could be highly acidic for reasons similar to that of squaric acid (see: Smith M. B.; March J. March's Advanced Organic Chemistry, 5th ed.; Wiley-Interscience: New York, 2001; p 70).
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The importance of the rate of arylation matching the rate of deprotonation has been noted earlier by Buchwald and co-workers see ref 5q
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The importance of the rate of arylation matching the rate of deprotonation has been noted earlier by Buchwald and co-workers (see ref 5q).
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45
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84977291942
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The squaramides 1b-d respectively were prepared as reported in: Schmidt, A. H. Synthesis 1980, 961.
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The squaramides 1b-d respectively were prepared as reported in: Schmidt, A. H. Synthesis 1980, 961.
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