75420-77-8Relevant academic research and scientific papers
Vicinal Diamination of Arenes with Domino Aryne Precursors
Li, Lu,Qiu, Dachuan,Shi, Jiarong,Li, Yang
supporting information, p. 3726 - 3729 (2016/08/16)
Vicinal diamination of domino aryne precursors was achieved with sulfamides. The reaction proceeds through a two-aryne pathway, accepting two N-nucleophiles at the 1,2-positions of an arene ring. Symmetrical and unsymmetrical diaminobenzenes were readily obtained.
Basicity of Nitrogen-Sulphur(VI) Compounds. Part 6. Ionization of NN'-Di- and N-Mono-substituted Sulphamides and Dihydro-2,1,3-benzothiadiazoline and Benzothiadiazine 2,2-Dioxides (Cyclic Sulphamides)
Burke, Padraig O.,McDermott, Sean D.,Hannigan, Thomas J.,Spillane, William J.
, p. 1851 - 1854 (2007/10/02)
36 Di- and mono- and two tri-substituted sulphamides have been synthesised and their ionization equilibria in base (Schemes 1-3) have been studied.Many of the sulphamides are new materials.The pKa values obtained for each series have been correlated in Hammett and Taft plots.The Hammett ? values obtained for the ionization of the proximate hydrogen are ca. 2.3.The Taft ?* value obtained for ionization of the 'remoter' hydrogen is 1.68.The six-membered cyclic sulphamides are more acidic than their acyclic analogues by ca. 2.5 pKa units and the five-membered cyclic sulphamides are ca. 4 pKa units more acidic than model open-chain counterparts.Sulphur d-orbital involvement and ring-strain are suggested as possible sources of this 'acid-strengthening' effect.
