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N21,N22-carbonyl-bridged biliverdin. red-blue color change effected by conformation

✍ Scribed by Stefan E. Boiadjiev; David A. Lightner


Book ID
102342978
Publisher
Journal of Heterocyclic Chemistry
Year
2005
Tongue
English
Weight
81 KB
Volume
42
Category
Article
ISSN
0022-152X

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✦ Synopsis


An N 21 ,N 22 -carbonyl-bridged mesobiliverdin, prepared in high yield by reaction of the unbridged parent (λ max 639 nm, ε 15,700, chloroform) with 1,1'-carbonyldiimidazole and 1,8-diazabicyclo[5.4.0]undec-7ene, gave magenta-colored solutions in chloroform that absorb strongly in the visible spectrum (λ max 534 nm, ε 27,700) and shifted to bright blue (λ max 669 nm, ε 35,300) upon addition of trifluoroacetic acid.