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Other than enol and squaric acid derivatives. For some methods of preparation, see
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For the synthesis of some polycyclic halocyclobutenes, see
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For some routes to enantioenriched cyclobutenes, see
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77956593261
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All enol ethers used in this work were obtained from Stericol [1-(2,4,6-triisopropylphenyl)ethanol] through the dichloroenol and ynol ethers, following a procedure similar to that described in
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All enol ethers used in this work were obtained from Stericol [1-(2,4,6-triisopropylphenyl)ethanol] through the dichloroenol and ynol ethers, following a procedure similar to that described in
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33
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77956585126
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The relative stereochemistry in 2a has been assigned from considerable antecedent for the face of the cycloaddition and by NOE experiments for the face of the reduction
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The relative stereochemistry in 2a has been assigned from considerable antecedent for the face of the cycloaddition and by NOE experiments for the face of the reduction.
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36
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77956567423
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Reductive elimination was also attempted directly on 2a with chromium perchlorate; however, a mixture of products containing only a minor amount of cyclobutene 4a was produced
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Reductive elimination was also attempted directly on 2a with chromium perchlorate; however, a mixture of products containing only a minor amount of cyclobutene 4a was produced.
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37
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77956570584
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For examples of vinylic chloride coupling reactions, see
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