A novel and simple synthetic route for a piperazine derivative

Abstract

Um novo derivado da piperazina, 5-oxopiperazinio-3-sulfonato monohidratado, foi produzido a partir de uma rota sintética simples como resultado da adição do íon bisulfito, HSO 3 -, ao anel e do ataque nucleofílico de moléculas de água a moléculas de pirazina. O material isolado foi caracterizado por RMN, espectrometria de massa, infravermelho e difração de raios-X.A new derivative of piperazine, 5-oxopiperazinium-3-sulfonate monohydrate, was produced from a simple synthetic route as a result of the nucleophilic addition to HSO 3 -bisulphite ion and of the nucleophilic attack of water molecules on pyrazine molecules. The isolated material was characterized by means of NMR, mass spectrometry, infrared, and X-ray diffraction.

Spectroscopic, antimicrobial and computational study of novel benzoxazole derivative

“…The theoretically calculated corresponding wave number for this mode is at 1336 cm -1 . A very sharp and intense band was observed at 1068 cm -1 in the IR spectrum of the title compound as reported by da Silva et al [75] and was assigned to the ring CH 2 rocking vibration.…”

Molecular Interactions of a Polyaromatic Surfactant C5Pe in Aqueous Solutions Studied by a Surface Forces Apparatus

“…Interestingly, the two surfaces were stretched for about 6 nm before detachment (jump apart) as shown in Figure b, which indicates a stretch of each film by ∼3 nm. The extended length of C5Pe molecules was estimated to be 2.7 nm based on molecular configuration of C5Pe molecule, the bond lengths of C–C (SP 3 –SP 3 ), C–N, C–O, and C–C (benzene) to be 0.15, 0.14, 0.14, and 0.14 nm, respectively, and the bond angle to be 109.5°, 180°, 180°, and 120°, respectively. , The actual molecular length of C5Pe should be smaller than 2.7 nm. The stretching associated with separation shown in Figure b confirms that C5Pe molecules aggregate on mica surface upon exposure to aqueous environment, as also visualized by AFM imaging.…”

Spectral investigations, DFT computations and molecular docking studies of 1,7,8,9-tetrachloro-10,10-dimethoxy-4-{3-[4-(2-methylphenyl)piperazin-1-yl]propyl}-4-azatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione

“…For the title compound CeN stretching vibrations (C 40 eN 38 , C 39 eN 38 , C 45 eN 47 and C 46 eN 47 ) are found at 901 cm À1 in the Raman spectrum and at 1150, 1092, 1016, 897 cm À1 theoretically. Two absorptions characteristic for the piperazine ring, at 1130 and 1168 cm À1 and assigned for the CeN stretching vibrational modes were observed by da Silva et al [48].The shift in the wavenumber may be attributed to the bulky groups attached to the piperazine ring. The CeC stretching vibrations in the piperazine ring were reported at 972, 903 cm À1 [46].…”

“…Renjith et al [19] reported the vibrations of CH 2 groups in the piperazine ring (the asymmetric stretch y as CH 2 , symmetric stretch y s CH 2 , the scissoring vibration and wagging vibration) in the range 2980e2957, 2902e2822 cm À1 respectively. A very sharp and intense band was observed at 1037 cm À1 by da Silva et al [48] and was assigned to Abbreviations: y-stretching; d-in-plane deformation; g-out-of-plane deformation; t-twisting; I-cyclohexene ring; II-piperazine ring; III-phenyl ring; IR I -IR intensity; R ARaman activity; s-strong; w-weak; m-medium. a % of PED is given in the brackets with the assignments.…”