✦ LIBER ✦
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
No coin nor oath required. For personal study only.
✦ 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.