A matter of control: A chiral quaternary ammonium bifluoride catalyst in combination with silyl nitronates results in the highly diastereo- and enantioselective formal conjugate addition of nitroalkanes to nitroalkenes (see scheme). The resulting 1,3-dinitro compounds bear two defined stereocenters, which can serve as versatile chiral building blocks in organic synthesis.
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Ooi et al. (2006) studied this question.
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