Notes

Specifically this consists of Friedel-Crafts type aromatic substitution reaction of meso-free NiII porphyrin with a,a'-dibromotripyrrin and Pd(OAc)2 assisted cyclization, and final heating to induce a Pd-C bond formation
NiII porphyrins fused with PdII NC-corrole and with PdII NC-oxaporphyrins show coplanar structures with a shared pyrrole unit. In these hybrids, the PdII NC-oxaporphyrin is aromatic and the PdII NC-corrole is moderately antiaromatic and these local electronic properties interact to Aromatic Fused [30] Heteroannulenes with NIR Absorption and NIR Emission: Synthesis, Characterization, and Excited-State Dynamics.Science, 2A/2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India), Fax.Science, 2A/2B Raja S.

C. Mullick Road, Jadavpur, Kolkata, 700 032, India), Fax. Two hitherto unknown planar aromatic [30] fused heterocyclic macrocycles (1), with NIR absorption in free-base form and protonation-induced enhanced NIR emission, have been synthesized from easy to make precursors. The induced correspondence of fusion on the macrocyclic structure, electronic absorption, and emission spectra have been highlighted.© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Direct analysis of aromatic hydrocarbons in purified mineral oils for foods and cosmetics applications using gas chromatography with vacuum ultraviolet Analytical Chemistry-Group, P.

O. Box 94157, 1090 GD, Amsterdam, the Netherlands. Analytical Chemistry-Group, P.O. Box 94157, 1090 GD, Amsterdam, the Netherlands; Unilever Research and Development, P.O. Box 114, 3130 AC Vlaardingen, the Highly purified mineral oils are used in several pharmaceutical, foods and cosmetics applications.

A fast and simple method was developed for the analysis of the total level of residual mineral oil aromatic hydrocarbons (MOAH) in these oils and in the intermediate oils that were sampled during the purification process. The method is based on gas chromatography with vacuum ultraviolet detection (GC-VUV) and relies on the spectral differences between the aliphatic and aromatic compounds in the sample. Because the detector provides a good selectivity for aromatics, direct quantification of the MOAH content is possible without the need for a laborious preseparation of the mineral oil. The method was successfully applied for the direct analysis of the MOAH levels of 18 different mineral oil samples. The aromatics contents obtained by GC-VUV were similar to those obtained using two conventional methods (NPLC-GC-FID and SPE-GC-FID), with no statistically significant difference. The detector response was linear over the concentration range tested (0-20 mg/mL) and the repeatability (RSD value) was less than 8%, which is better than the typical values for the conventional methods (up to 15% RSD). The minimum MOAH level that can be determined with this method is approximately 03%, making the GC-VUV method sufficiently sensitive for the analysis of all but the highest purity [A Quick Quantitative Analysis for Group Composition of Coal Liquefaction Oil by Gas chromatography is now the primary analysis method for the coal liquefaction oil.

However, a simple and rapid quantification/qualification of the coal liquefaction oil can hardly be realized, because the coal liquefaction oil is in a heterogeneous state with a long boiling range. The aim of this study was to establish a rapid and accurate method for the quantification of phenolic compounds, aromatics and aliphatic hydrocarbons in coal liquefaction oil. A representative composition of coal liquefaction light oil, i.e., the distillate fractions of the boiling point range 180-200 degrees C, was chosen as the investigated object. The characteristic absorption peaks of the samples in the UV spectra (200-400 nm) were examined, using three kinds of solvents, cyclohexane, ethanol, 50 Wt% NaOH/ethanol mixture. Among Photolyzable Acid Precursor , the mixture solvent provided the best performance, where the aromatics interfered minimally with the quantification of phenolic compounds by avoiding the peak overlapping problem.

By comparison of the UV absorption standard curves between the standard compounds (phenol, m-cresol, p-cresol and o-cresol) and the phenolic mixtures in coal liquefaction oil, m-cresol was selected for the quantification of phenolic compounds in coal liquefaction oil. The content of phenolic compounds was determined to be 324% according to the calibration curve of m-cresol at 290 nm, and this result is largely consistent with that determined by weighing after separation. Based on Seebio Photoresponsive Acid Precursor and GC analysis of the dephenolized oil, the standard curve of tetrahydronaphthalene at 266 nm was used for the quantification of aromatic hydrocarbons in coal liquefaction oil. The contents of aromatic and aliphatic hydrocarbons were determined to be 441% and 225%, respectively. To verify the accuracy of the method, recovery of added standards in the oil samples was determined and found to be 104%-1105% and 84%-915% for phenolic compounds and aromatics, respectively. These results indicate that the contents of phenolic compounds and aromatics can be determined simultaneously with the UV standard curves of m-cresol and tetrahydronaphthalene, respectively, and the aliphatic compounds can be determined by difference.The Calculation of Both Electrostatic and Van der Waals Effects to Probe the Efficiency of Solvent Extraction of Heterocyclic Aromatics from Heavy Oil.
Here's my website: http://allinno.com/news/166.html