Polythiazide

Abstract

The crystal structure of the title compound, C11H13ClF3N3O4S3 (systematic name: 6-chloro-2-methyl-3-{[(2,2,2-trifluoro­eth­yl)sulfan­yl]meth­yl}-3,4-dihydro-2H-1,2,4-benzothia­diazine-7-sul­f­on­amide 1,1-diox­ide; CRN: 346–18–9), exhibits a two-dimensional network of hydrogen-bonded mol­ecules parallel to (01). The NH and NH2 groups act as donor sites and the sulfonyl O atoms as acceptor sites in N—H⋯O hydrogen bonds, and a C—H⋯O interaction also occurs. The thiadiazine ring adopts an envelope conformation with the N atom bonded to sulfur at the tip of the flap, and the methyl substituent is in an axial position.

Crystal structure of the α-racemate of methohexital

“…4) shows that dimer formation is feasible for N-HÁ Á ÁO C2 and N-HÁ Á ÁO C4 connections only, whereas N-HÁ Á ÁO C6 should be the preferred connection mode for chain formation. Indeed, five crystal structures containing N-HÁ Á ÁO C6 chain motifs are known and their CSD refcodes are DMCYBA01 (Nichol & Clegg, 2005), DULMED (Gelbrich et al, 2010), MDEBAR (Wunderlich, 1973), MIBABA (Wilhelm & Fischer, 1976), OBIPUM (Gelbrich & Griesser, 2009). So far, the crystal structure with refcode VEMQUB (Savechenkov et al, 2012) is the only example in the set where another chain type, viz.…”

“…Apart from the title structure, two analogues with refcodes CXALBA (Dideberg et al, 1975) and DULMAZ (Gelbrich et al, 2010) also form N-HÁ Á ÁO C2 bonded dimers. The alternative N-HÁ Á ÁO C4 dimer was observed in the two structures with refcodes ALLBTC (Pyżalska et al, 1980) and MEPBAB01 (Lewis et al, 2005).…”

Two polymorphs and the diethylammonium salt of the barbiturate eldoral

“…As part of a larger investigation of derivatives of barbituric acid (Gelbrich et al, 2007(Gelbrich et al, , 2010a(Gelbrich et al, ,b, 2011Zencirci et al, 2009Zencirci et al, , 2010Gelbrich, Zencirci et al, 2010), we have studied two solid forms of 5-ethyl-5-(piperidin-1-yl)barbituric acid, (I) , and its diethylammonium salt, (II). Compound (I), also known as eldoral, has been marketed as a sedative and hypnotic drug since 1936 (Anders, 1954).…”

Tetragonal polymorph of 5,5-dichlorobarbituric acid

“…For the monoclinic and orthorhombic polymorphs, see: Gelbrich et al (2011). For related structures, see: Gartland & Craven (1971); Gelbrich et al (2007Gelbrich et al ( , 2010Gelbrich et al ( , 2010a; Nichol & Clegg (2007); Zencirci et al (2009Zencirci et al ( , 2010; DesMarteau et al (1994). For a description of the synthesis, see: Ziegler et al (1962).…”