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A conception of the "Atom Economy" introduced by Professor Barry M. Trost has found quick and unanimous understanding, support, and appreciation in the chemistry community as a philosophical guideline for the development of organic synthesis in the 21st century. On the other hand, in the current literature one can notice another trend developing as a paradigm for the synthetic methodology of the future, which is simplicity of experimental conditions, or as we prefer to call it, operationally convenient reaction conditions.
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Due to the minute integral intensity of some peaks found in the NMR spectra of the crude reaction mixtures it was impossible to conclude whether they belong to another diastereoisomer or to byproducts.
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The (2R,3S) absolute stereochemistry for the isopropyl and aromatic derivatives is a consequence of the Cahn-Ingold-Prelog priorities (see ref 16) and is stereochemically equivalent to the (2R,3R) absolute configuration in the aliphatic series of compounds.
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While in the case of bis-methyl-containing 6f derivative the presence of the α-substituent might create unfavorable steric interactions and decrease electrophilicity of the C,C double bond, the high C-H acidity of the benzylic methylene group in 6e might be the cause of the unsuccessful results.
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