naa a22 4500 510734618 CHVBK 20180411083005.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s12039-013-0488-5 doi (NATIONALLICENCE)springer-10.1007/s12039-013-0488-5 Synthesis of 2,6-diaminopyridine substituted α -oxoketene S , N -acetals: Crystal structure and hydrogen bonding interactions [Elektronische Daten] [OKRAM SINGH, LAISHRAM DEVI, NEELADRI DAS] Polyaza α-oxoketene S,N-acetals can exist as either enamino or imino tautomeric forms. Based on the spectroscopic data and structural analysis of one of the S,N-acetals, the stereochemistry was unambiguously assigned as an all-E-configuration. The crystal structure confirms the enamino structure and shows extensive use of C-H⋯X (X = N, O, and S) weak hydrogen bonding interactions, thereby generating a 3-dimensional network in solid state. Graphical Abstract A new series of polyaza α-oxoketene S,N- acetals 3a-d was synthesized by thiomethyl displacement of α-oxoketene dithioacetals 2a-d with lithiated 2,6-diaminopyridine in good yields. The rotameric conformations and hydrogen bonding interactions are discussed with crystal structure. Indian Academy of Sciences, 2013 Polyaza nationallicence heterocycles nationallicence conformation nationallicence synthesis nationallicence crystal structure nationallicence SINGH OKRAM Department of Chemistry, Manipur University, 795 003, Canchipur, India aut DEVI LAISHRAM Department of Chemistry, Manipur University, 795 003, Canchipur, India aut DAS NEELADRI Department of Chemistry, Indian Institute of Technology Patna, 800013, Patna, India aut Journal of Chemical Sciences Springer India 125/5(2013-09-01), 1103-1107 0974-3626 125:5<1103 2013 125 12039 https://doi.org/10.1007/s12039-013-0488-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12039-013-0488-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- SINGH OKRAM Department of Chemistry, Manipur University, 795 003, Canchipur, India aut NATIONALLICENCE 700 1- DEVI LAISHRAM Department of Chemistry, Manipur University, 795 003, Canchipur, India aut NATIONALLICENCE 700 1- DAS NEELADRI Department of Chemistry, Indian Institute of Technology Patna, 800013, Patna, India aut NATIONALLICENCE 773 0- Journal of Chemical Sciences Springer India 125/5(2013-09-01), 1103-1107 0974-3626 125:5<1103 2013 125 12039 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer