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- W2028755433 abstract "Reactions of 5,5′-dilithiated 1,1-bis(2-thienyl)ethane (3) with different substituted dichloroboranes led to the novel 5,15-diboraporphyrinogenes 5−8, in good yields. Amino groups at the boron atoms stabilize the macrocycles 5−7, whereas the first organyl-stabilized diboraporphyrinogene 8 contains the 2,3,5,6-tetramethylphenyl substituent at the boron atoms. A [3+1] approach yields the 5,10-diboraporphyrinogene 13 by treating 2,5-bis[1-(5-lithio-2-thienyl)ethyl]thiophene (4) with the 2,5-diborylthiophene derivative 9. Analogously, the mixed 5,10-diboraporphyrinogenes 15 and 16 are formed from 4 and 2,5-diborylfuran 11 and 2,5-diboryl-N-methylpyrrole 12, respectively. The constituents of the new compounds follow from spectroscopic and structural data. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)" @default.
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- W2028755433 date "2002-08-01" @default.
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- W2028755433 title "Synthesis and Structure of Diboraporphyrinogenes" @default.
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