Заранее спасибо.
1) Tetrahedron
Volume 50, Issue 39, 1994, Pages 11427-11440 , Chang-Hee Lee1 and Jonathan S. Lindsey
One-flask synthesis of meso-substituted dipyrromethanes and their application in the synthesis of trans-substituted porphyrin building blocks
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http://dx.doi.org/10.1016/S0040-4020(01)89282-6