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- W2096706169 abstract "Abstract Six N , N ′‐alkylene‐bridged bispyrroles 9a–9e and one N , N ′‐oxaalkylene‐bridged bispyrrole 16 with a reactive group at C‐1 of each pyrrole unit were synthesized in 53–78% yields. Acid‐catalyzed “biomimetic” condensations of the bispyrroles with N , N ′‐C 3 to N , N ′‐C 5 bridges yielded N , N ′: N″,N ‴doubly bridged porphyrinogens 14 , 15 , 17 , 18 , which are novel heterocyclic systems. By exchanging one CH 2 group for oxygen in the N , N ′‐alkylene chain of 9e to reduce the Prelog strain, the condensation yield was significantly increased. The N , N ′‐C 1 ‐and the N , N ′‐C 2 ‐bridged bispyrroles 9a , 9b did not cyclize to porphyrinogens, but in one case cyclized to give a N , N ′‐C 1 ‐bridged dipyrrylmethane 12 instead." @default.
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- W2096706169 date "1993-10-12" @default.
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- W2096706169 title "Novel Porphyrinoids, 14. – Biomimetic Syntheses of DoublyN,N′-Bridged [18]Porphyrinogens" @default.
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