Azine-Hydrazone Tautomerism of Guanylhydrazones: Evidence for the Preference Toward the Azine Tautomer
作者:Sumit S. Chourasiya、Deepika Kathuria、Sampada S. Nikam、Ashok Ramakrishnan、Sadhika Khullar、Sanjay K. Mandal、Asit K. Chakraborti、Prasad V. Bharatam
DOI:10.1021/acs.joc.6b01258
日期:2016.9.2
using quantum chemical methods, whose tautomeric preference toward the azine tautomer is in the range of 3–8 kcal/mol. Twenty new azines were synthesized and isolated in their neutral state. Variable temperature NMR study suggests existence of the azine tautomer even at higher temperatures with no traces of the hydrazone tautomer. The crystal structures of two representative compounds confirmed that the