- The unsubstituted ortho-amidino benzoic acid: crystal structure, characterization and pK a determination
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The simplest o-amidino benzoic acid—2-(amino(imino)methyl)benzoic acid—has been isolated in 23?% yield as a side product of the reaction of phthalonitrile and ammonia along with desired 1-imino-1H-isoindol-3-amine. This amidino acid was fully characterized by nuclear magnetic resonance, IR spectroscopy, mass spectrometry; pKa values were also determined. X-ray diffraction study and quantum chemical calculations revealed that in the solid state it exists as a zwitterion that is stabilized by intermolecular hydrogen bonds.
- Hordiyenko, Olga V.,Biitseva, Angelina V.,Kostina, Yuliya Yu.,Zubatyuk, Roman I.,Shishkin, Oleg V.,Groth, Ulrich M.,Kornilov, Mikhail Yu.
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- Use of diiminoisoindoline derivatives or 3-aminoisoindolone derivatives for dyeing keratin fibers, and dye compositions containing them
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Diiminoisoindoline derivatives or 3-aminoisoindolone derivatives, or tautomeric forms thereof, used as oxidizing-agent-free dye precursors in dyeing keratin fibers, in particular human keratin fibers such as the hair, without an oxidizing agent, in the presence of compounds containing a primary or secondary amine function; dye compositions containing these compounds and to the dyeing devices and processes used.
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