Ontology highlight
ABSTRACT:
SUBMITTER: Zhu Y
PROVIDER: S-EPMC2564284 | biostudies-literature | 2007 Jan
REPOSITORIES: biostudies-literature
Zhu Yaoqiu Y Silverman Richard B RB
The Journal of organic chemistry 20070101 1
Porphyrins are stable molecules with a macrocyclic conjugated system and often peripheral substituents. This unique structure makes the electronic properties of the four meso-carbons (the methine bridges) nearly identical. Replacement of the weakly electron-polarizing 2,4-vinyl groups of protoporphyrin IX with strongly electron-polarizing acetyl groups not only leads to much lower meso-carbon reactivities toward electrophilic aromatic substitution but also results in a significant meso-selectivi ...[more]