Synthesis of N,N,N′-Trisubstituted Amidines, Quaternary Amidinium Salts and Aminal Esters

✍ Scribed by Prof. Dr. H. Bredereck; Dr. F. Effenberger; Dipl.-Chem. G. Simchen

• Publisher: John Wiley and Sons
• Year: 1962
• Tongue: English
• Weight: 230 KB
• Volume: 1
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.196203313

✦ Synopsis

assuming that the relationship may be linearly extrapolated, the radius of the proton in (11) is almost zero. The correlation between the location of the absorption band and the ionic radius of the central ion points to a steric effect. We assume that the molecule is spread in the plane so that the valency angle at the meso C-atom becomes larger than normal. An analogous situation exists in the case of aza-compounds, in which the meso-methine group is substituted by a trigonal N-atom.