Synthesis and characterization of semicarbazone of p-hydroxy-3-methoxy acetophenone (SPH3MA) single crystal

Synthesis and spectroscopic characterization of 13C4‐labeled 4‐cyano‐2‐oxobutyraldehyde semicarbazone: A metabolite of nitrofurazone

“…The resonance of the azomethine carbon (C e ) emerges at δ 136.2, consistent with the chemical shifts observed in other semicarbazone derivatives. 22 The distinct carbon resonances at δ 155.6 and 120.4 are characteristic of the amide carbonyl carbon (C b ) and nitrile (C i ) carbons, respectively. 22 The structural assignment of COBS was further verified using homonuclear correlation (COSY) and heteronuclear correlation ( 1 H- 13 C HSQC, T A B L E 1 Effect of Ra-Ni on nitrofurazone reduction.…”

“…22 The distinct carbon resonances at δ 155.6 and 120.4 are characteristic of the amide carbonyl carbon (C b ) and nitrile (C i ) carbons, respectively. 22 The structural assignment of COBS was further verified using homonuclear correlation (COSY) and heteronuclear correlation ( 1 H- 13 C HSQC, T A B L E 1 Effect of Ra-Ni on nitrofurazone reduction. Percentage COBS formed was determined by measuring the increase parent ion of (m/z 169) COBS and the decrease in parent ion of nitrofurazone 199 [M + H] + , respectively.…”

“…Amount of Ra-Ni (mg) % COBS by LC-MS Time (h) S6) revealed distinct absorption bands at 2255, 1670, and 1606 cm À1 confirming the presence of cyano, oxo, and amide functionalities, respectively. 22 The peak at 1572 cm À1 was assigned to the C=N stretching vibration, whereas intense bands at 3446, and 3345, and at 3185 cm À1 designated N-H stretches of NH 2 and NH, respectively. 22,23 Finally, identity of the compound was also confirmed by LC-MS in both the positive and negative modes.…”

“…22 The peak at 1572 cm À1 was assigned to the C=N stretching vibration, whereas intense bands at 3446, and 3345, and at 3185 cm À1 designated N-H stretches of NH 2 and NH, respectively. 22,23 Finally, identity of the compound was also confirmed by LC-MS in both the positive and negative modes. Parent ions at m/z 169 [M + H] + and 167 [M À H] À and fragments at m/z 126 and m/z 124 resulted from the loss of HCNO in positive and negative ion modes, respectively, and were consistent with observations of Wang et al 18 Although isotopically labeled nitrofurazone could be synthesized in a single-step condensation reaction using commercially available 13 C, 15 N 2 -labeled semicarbazide hydrochloride and 5-nitro-2-furaldehyde, we chose to synthesize 13 C 4 -furan labeled nitrofurazone because we needed 13 C 4 -5-nitro-2-furaldehyde for other projects.…”

The corrosion inhibition behaviors of 2′‐hydroxy‐acetophenone for AZ91D magnesium alloy

“…A strong peak at 3433/cm is assigned to the stretch vibration of -OH in the structure of 2 0 -hydroxyacetophenone. And the bands at 1632 and 1416/cm are assigned to -CO stretching vibration and -CH 3 stretching vibration from 2 0 -hydroxy-acetophenone, respectively [40]. Interestingly as shown in Fig.…”