NMR Studies on Imidines. VI.¹H and ¹³C Nuclear Magnetic Resonance Study on the Tautomerism of Phthalic Imidine.

Abstract

Phthalic imidine is shown to be present in DMSO-d6 solution as a 5 : l mixture of 3-amino-1~-isoindol-l-imine (9) and 1,3-diiminoisoindoline (fi) by The amino tautomer 9 also predominates in other solvents: CDC13,

New model phthalonitrile resin system based on self‐promoted curing reaction for exploring the mechanism of radical promoted‐polymerization effect

“…Since the peak was shifted to downfield, we consider that then new‐produced methine may be adjacent to an electron‐withdrawing group. Combined with the previous results, it can be inferred to be adjacent to isoindoline moiety in this system . In addition, the peak at 2.18 ppm is probably due to the chemical shift of the residual methylene in the alicyclic groups due to the change of the chemical environment .…”

Platinum(II)‐Mediated Double Coupling of 2,3‐Diphenylmaleimidine with Nitrile Functionalities To Give Annulated Pentaazanonatetraenate (PANT) Systems

“…Theoretical [43,44] and X-ray diffraction [42] studies indicate that the imino form possesses lower energy and is therefore expected to be the predominant in the solution, whereas the amino form is prevalent in the solid state because of the intermolecular hydrogen bond that is formed. On the other hand, NMR spectroscopic studies [45] show that phthalimidine exists in [D 6 ]DMSO solution as a 5:1 mixture of the amino and imino forms. For 6-9, the reaction mixtures rapidly (in ca.…”

NMR studies on imidines. VII. The tautomerism of mono‐n‐aryl substituted phthalic imidines. A 1H and 13C nuclear magnetic resonance study

“…A detailed ' H and 13C NMR study (7) has revealed that the parent compound 1 exists in DMSO-d6 solution as a 5:l tautomeric mixture in which the amino form J&i predominates.…”