An efficient method for the exclusive formation of 21-Oxa and 21-Thia tetra phenyl porphyrins in high yields by condensation of dipyrromethane and furan or thiophene diols is described.
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Acknowledgements: This work was supported by a grant from the Department of Science & technology (DST) and Council of Scientific and Industrial Research (CSIR), Govt. of India, New Delhi.
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