On the claisen rearrangement of 1,4-diaryloxy-2-butynes |
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Authors: | S Ramakanth K Narayanan KK Balasubramanian |
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Institution: | Department of Chemistry, Indian Institute of Technology, Madras - 600 036, India |
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Abstract: | A proton nmr follow-up provided conclusive evidence for the involvement of two sequential Claisen rearrangements in the thermal rearrangement of 1,4-diaryloxy-2-butynes to 11a-methylpterocarpans . A detailed study of the rearrangement of 1,4-diaryloxy-2-butynes in polyethyleneglycol-200 (PEG-200), indicated a definite possibility of selective synthesis of either benzofuron (3,2-b )benzofuran or benzofuro(2,3-b)benzofuran by varying the temperature of the reaction alone |
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