Tris(biphenylenevinyl)methane
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Prof. Dr. Richard Kuhn; Dr. Herbert Fischer
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Article
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1964
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John Wiley and Sons
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English
โ 132 KB
is simply treated with the alkyne in acetic anhydride. Thus, dimethyl 5-methyl-l,2-trimethylenepyrrole-3,4-dicarboxylate is obtained in 76 % yield by merely warming proline with dimethyl acetylenedicarboxylate in acetic anhydride at 130 "C for 1 hr. The kinetics of the release of carbon dioxide ind