The structures of two thiosemicarbazones are described: syn E-1-cyclopentano-4-ethyl-3-thiosemicarbazone (1) and syn,E-1-cyclopentano-4-phenyl-3-thiosemicarbazone (2). Crystal data: for 1: tetragonal, P4(3) (#78), a = b = 8.922(7) Angstrom, c = 12.899(13) Angstrom, and Z = 4; for 2: monoclinic a = 15.163(18) Angstrom, b = 7.482(5) Angstrom, c = 12.467(15) Angstrom, beta = 119.04(7)degrees, and Z = 4. In 1, molecules are linked by hydrogen-bonding into infinite chains with non-planar 9-ring subunits in which thioamides interact with the H-N-C-N-N groups of neighbors. Thioamide groups in 2 form dimers linked by N-B ... HS hydrogen-bonds with a planar 8-ring as in solid state structures of carboxylic acids. The semicarbazide syn conformation fosters formation of N-H ... N intramolecular hydrogen-bonding in each structure. The solid state structures are consistent with their infrared and proton nuclear magnetic resonance spectra.
Facile and convenient synthesis of 2,4-disubstituted and 2,3,4-trisubstituted 1,3-thiazoles
作者:Alaa A. Hassan、Shaaban K. Mohamed、Nasr K. Mohamed、Kamal M.A. El-Shaieb、Ahmed T. Abdel-Aziz、Joel T. Mague、Mehmet Akkurt
DOI:10.1080/17415993.2015.1114621
日期:2016.3.3
ABSTRACT An efficient route for the synthesis of (E)-2-(2-(2-nitrobenzylidene)-hydrazinyl)-4-phenylthiazol-3-ium bromide, (E)-2-(2(substituted benzylidene)hydrazinyl)-4-phenylthiazoles and (E)-4-(4-bromophenyl)-2-(cycloalkylidenehydrazono)-3-phenyl-2,3-dihydrothiazoles by reaction of 1-aryl-2-bromoethanones with 2-(1-substituted methylidene)hydrazinecarbothioamides and cycloalkylidene-N-phenyl-hyd
The Behavior of (cyclic‐alkylidene)hydrazinecarbothioamides in Cyclization with Dimethyl acetylenedicarboxylate
作者:Alaa A. Hassan、Shaaban K. Mohamed、Nasr K. Mohamed、Kamal M. A. El‐Shaieb、Ahmed T. Abdel‐Aziz、Joel T. Mague、Mehmet Akkurt
DOI:10.1002/jhet.2803
日期:2017.5
din‐5‐ylidene)‐acetate derivatives were synthesized via condensation alkylidene‐N‐substituted hydrazinecarbothioamides with dimethylacetylenedicarboxylate. The synthesized compounds were characterized by using different spectroscopic methods and confirmed by single crystal X‐ray analysis. The behavior of (cyclic‐alkylidene) hydrazinecarbothioamides in cyclization was presented. The mechanism of transformation