Effect of aromatic ring fluorination on CHp interactions: microwave spectrum and structure of the 1,2-difluorobenzeneacetylene dimerAkmeemanaA.KangJ.DorrisR.NelsonAndertonPeeblesS.ingentaconnectPhysical Chemistry Chemical Physics Cambridge Royal Society of Chemistry...
In rhizosphere, the distantly related to the extradiol dioxygenases from detected diversity of novel ring-cleavage dioxy- known pathways (Figure 6), and bacterial hosts are genases highlighted a broad-spectrum degradation evidently not known. capacity of environmental contaminants and natural The ...
The chemical structures were confirmed by IR and NMR spectro- scopy and elemental analysis. Compound 1 exhibited IR absorption at 1850 and 1780 cm À1, which is characteristic of a carboxylic anhydride. The 13C NMR spectrum of 1 exhibited 18 peaks due to symmetry, indicating the formation of...
The ultra-violet (UV) absorption spectrum of PSAM showed four signals λmax (logε): 211 (4.15), 221 (3.92), 260 (3.87) and 298 (3.57) which indicated π → π* transition of carbon–carbon double bond of benzene ring and n → π* transition of carbonyl group, respectively...
The replacement of hydrogen atoms of the benzene rings in aromatic azomethines is accompanied by changes in the state of the nitrogen atom and the C=N bond. This is expressed in a shift of the signals in the NMR spectra and in a change in band intensities for the stretching vibrations of...
A representative FT-IR spectrum for PAI8a is illustrated in Fig. 1. Some of the polymer’s structures were also confirmed by 1H NMR spectroscopy. Fig. 2 shows the 1H NMR (400 MHz) spectrum of PAI8a. In the 1H NMR spectrum of this polymer, the appearances of the NH protons of amide...
albeit with different slopes. This trend is due to the increased efficiency of simultaneously destroying the pure aromatic and producing the nitrile-functionalized aromatic. Both benzene and indene display similar trends with their CN/H ratios nearly identical at 0.2 Myr. Assuming similar production...
Interestingly, when compound1was reacted with four equivalents oftert-Butyl isonitrile (tBuNC) in benzene at ambient temperature, a deltahedron carborane derivative3was obtained in 26% isolated yield (Fig.2a). The11B NMR spectrum of3shows broad singlets atδ = −12.2 ppm forB–C≡...
The yield of the light tan crystalline product was 96.7% based on benzene. Determination of bromine and IR spectrum showed the product to be essentially hexabromobenzene, said product having a melting point of 329°-330°C. EXAMPLE II Preparation of Pentabromotoluene To a similar apparatus as...
R2 represents a satured or unsatured alkylene bridge having up to 3 carbon atoms, optionally substituted by lower alkyl groups, preferably having 1 to 4 carbon atoms, chlorine NO2 or CN, in addition to which a 5- or 6-membered cycloaliphatic ring or a benzene ring may be fused to the...