C6H5CH3+ H2→ C6H6+ CH4. Hydrodealkylation strips the methyl group from toluene to produce benzene. Toluene disproportionation involves combining toluene so that the methyl groups bond to one aromatic ring, producing benzene and xylene. Benzene can also be obtained from petroleum reforming in which...
The peak between 2000 and 1700 cm−1 comes from the aromatic ring mono-substitution [32]. The benzene rings of both styrene and divinylbenzene deformation appear at the 1500 and 1400 cm−1 bands. The peaks detected at 1000–750 cm−1 can be assigned to the Si–O-Si and Si–O-...
The α-and β-peltatins (XXIX; R=H and Me, respectively) have their (displaced) benzenoid bands near 274 mμ, which at first sight seems remarkably low for a ring A oxygenated podophyllotoxin type. We might have predicted λmax 295–300 mμ for the peltatins, but, as Hartwell and Sc...
Furthermore, typical stretching vibration peaks associated with the CN group of TCNB were observed for both H-TCNB@Bz and H-TCNB@Tol at 2247 cm−1in FT-IR spectra. However, compared with the corresponding stretching vibration peak of H-TCNBα, the typical absorption peaks of H-TCNB@Cy ...
Each of the four carbon atoms in the square ring cyclobutadiene moiety of biphenylene has distorted sp2 hybrid orbitals and associated σ-bond angles of 120°, 90°, and 150°, as shown in Fig. 1(c). A number of higher polycyclics containing the biphenylene nuclei were prepared and...
X-ray crystal structure determination of compound 3 shows a half-chair conformation for the chelate ring with a symmetric arrangement of dibenzophosphole groups. Besides a preference for the latter achiral conformation, the planar structure of the dibenzophosphole groups can also be considered as ...
2a), the main peak at 284.8 eV was ascribed to graphite sp2 carbon, which was derived from the benzene ring; for comparison, g-C3N4 showed the main peak at 288.2 eV corresponding to the NCN sp2 carbon [47,48]. The N 1s XPS spectra (Fig. 2b) of the both two samples showed...
wereinvestigatedrespectivelybyin—situIRspectrometry.Threetypesofexperimentswerecarriedout.(1)IRspectraof thegas—phasepropylenebenzeneandisopropylbenzenewererecorded.(2)IRspectraoftheabove—mentionedsub— stancesasadsorbatesthathavecombinedwiththezeolitewaferwererecorded.(3)IRspectraofthereactionmodes wererecorded....
We thus reason that the well dispersion of C3N4 in PMoV2 solution gives rise to a molecular-level contact between them, for which the creation of phenol may be possible from the immediate attack of PMoV2 catalyst to the already activated benzene ring on C3N4 surface. Indeed, the present ...
The structure of the obtained polymer P-1 was con- firmed by the IR and 1H NMR spectroscopy. In the IR spectrum of the polymer film, the absorption peak at 992 cmÀ1 assignable to the cyclic C–O–C stretching from oxetane ring decreased, and showed a new ap- pearance of ...