Chns o analyzer series 2 2400 apparatus

All chemicals and solvents were purchased from Merck (Darmstadt, Germany), Fluka (Buchs, Switzerland), and Sigma–Aldrich (St. Louis, MO, USA) and were of commercial quality. They were used as received, except for 1,2-dichloroethane which was dried over calcium chloride and distilled at normal pressure, and pyridine which was stored over potassium hydroxide and then distilled. THF was dried by refluxing 1 h over potassium hydroxide and then distillated at normal pressure.
The structure, molecular formula, molecular weight, melting point, yield and elemental analyses of the new O-(arylcarbamoyl)-11-oximino-6,11-dihydro-dibenz[b,e]oxepins are presented in Table 7.
All melting points were recorded with an Electrothermal 9100 apparatus ((Bibby Scientific Ltd., Stone, UK) and are uncorrected. Elemental analyses were carried out using a CHNS/O Analyzer Series II 2400 apparatus (Perkin–Elmer, Waltham, MA, USA) and the results were within ±0.4% of theoretical values. IR spectra were recorded on a Vertex 70 FT–IR spectrophotometer (Bruker Corporation, Billerica, MA, USA). NMR spectra were recorded on a Unity Inova 400 instrument (Varian Medical Systems, Palo Alto, CA, USA) operating at 400 MHz for ¹H and 100 MHz for ¹³C. New dibenz[b,e]oxepins were synthesized according to the previously described procedure [11 ,28 ,29 ].

Melting points were measured using a Boetius hot plate microscope and are uncorrected. ¹H NMR and ¹³C NMR spectra were recorded on a Varian Gemini 300BB operating at 300 MHz for ¹H and 75 MHz for ¹³C. The spectra were recorded in CDCl₃ or DMSO-d₆ at 298 K and the chemical shifts are relative to TMS used as the internal standard. The bidimensional correlations spectra (COSY, HETCOR) were performed for complete assignment of chemical shifts. Fourier-transform IR spectra (for representative compounds) were recorded on a Bruker Vertex 70 spectrometer with horizontal device for attenuated reflectance and diamond crystal, in a spectral window ranging from 4000 to 400 cm⁻¹ or on a Nicolet Impact 410 Spectrometer in KBr pellets. Elemental analysis was performed on a Perkin Elmer CHNS/O analyzer Series II 2400 apparatus and the results were in agreement with the calculated values. All starting materials and solvents were purchased from common commercial suppliers and were used without purification unless otherwise noted.