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Other Lewis acids screened include AlCl3, TiCl4, SnCl4, and Sc(OTf) 3
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Other Lewis acids screened include AlCl3, TiCl4, SnCl4, and Sc(OTf) 3.
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79953900068
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For other representative examples of [2 〈 2] cycloaddition reactions that benefit from ultrasonic activation, see: (a) Ref 7g
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For other representative examples of [2 〈 2] cycloaddition reactions that benefit from ultrasonic activation, see: (a) Ref 7g.
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A competing oligomerization of the acrylic ester may account for the diminished yield in these cases since a highly polar yet intractable fraction is visible as a baseline spot in the TLC of the crude reaction mixtures
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A competing oligomerization of the acrylic ester may account for the diminished yield in these cases since a highly polar yet intractable fraction is visible as a baseline spot in the TLC of the crude reaction mixtures.
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Our attempt to use a stereoisomeric mixture of the β-benzyl, N, N-dimethyl α-chloroenamine without isolation was not successful, presumably due to competing oligomerization of this reactant at the warmer temperatures required for cyclocondensation. In addition, N,Ndiethyl- 2-phenylpropanamide failed to chlorinate efficiently under standard conditions with oxalyl chloride, presumably due to steric hindrance
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Our attempt to use a stereoisomeric mixture of the β-benzyl, N, N-dimethyl α-chloroenamine without isolation was not successful, presumably due to competing oligomerization of this reactant at the warmer temperatures required for cyclocondensation. In addition, N,Ndiethyl- 2-phenylpropanamide failed to chlorinate efficiently under standard conditions with oxalyl chloride, presumably due to steric hindrance.
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Checkers of the Organic Syntheses prep (ref 18a) also observed that early fractions of 7 boiling at 100-125 °C were mixtures of product and triethylamine
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Checkers of the Organic Syntheses prep (ref 18a) also observed that early fractions of 7 boiling at 100-125 °C were mixtures of product and triethylamine.
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