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Accelerated Bergman cyclization of porphyrinic-enediynes
Mahendra Nath1, John C Huffman, Jeffrey M Zaleski
1Department of Chemistry, Indiana University, Bloomington, IN, USA.
Chemical Communications (Cambridge, England)
|May 13, 2003
Abstract:
The Bergman cyclization of simple diethynylporphyrinic-enediynes exhibits a double activation barrier to the formation of Bergman cyclized product. Addition of H-atom acceptor accelerates the formation of the picenoporphyrin, indicating that the second barrier is rate limiting.