Organic Magnetic Resonance p. 745 - 756 (1983)
Update date:2022-08-31
Topics:
Abraham, Raymond J.
Plant, James E.
The synthesis and complete assignment of the 1H NMR spectra of 5-(o-pivaloylaminophenyl)-10,15,20-triphenylporphyrin (PIVTTP) and its two chiral dihydro adducts 3,4-dihydro-(PIVPTPC-I)- and 7,8-dihydro-(PIVPTPC-II)-porphyrins are reported.The use of the zinc complexes of the chlorins as chiral shift reagents with optically active bases is discussed.Comparison of the observed shift differences between the chlorins and the parent porphyrin with those calculated by a ring current model shows that a decrease in the ring current occurs on chlorin formation, and also specific effects occur at the reduced pyrrole ring, presumably reflecting different steric constraints.
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