Chapter 28 – Aromatic Compounds with Three Fused Carbocyclic Ring Systems : Anthracene, Phenanthrene, and Related Compoundsorganic chemistry, reviewDerivatives of the two hydrocarbons, anthracene and phenanthrene, C 14 H 10 , both containing three condensed benzene rings, are widely distributed in...
Comparative studies were first made to investigate the effect of including the extra fused benzene ring, and its orientation, into the previously investigated three-ring compounds, 4-phenyl 4MODIFIER LETTER PRIME-(4 ''-alkoxyphenylazo) benzoates (IIIna). Investigation of the mesophase behaviour was...
While a HOMA value of 6 is 0.38, those of two norcorrole rings in 5 are 0.57 and 0.54. We also investigated the conformations of 5 using density functional theory (DFT) calculations (Supplementary Fig. 10). While 5 in the solid state adopted nearly D2 conformation, the relative energies ...
Polycyclic aromatic hydrocarbons (PAHs) are natural and anthropogenic aromatic hydrocarbons with two or more fused benzene rings. Because of their ubiquitous occurrence, recalcitrance, bioaccumulation potential and carcinogenic activity,... NN Pozdnyakova - 《Biotechnol Res Int》 被引量: 41发表: 2012年...
Their crystalline structure remained intact in organic solvents, such as methanol, benzene, CHCl3 and hexane, irrespective of their polarity, in addition to aqueous HCl and NaOH solutions (1 M). We resolved the crystalline structure using XRD measurements in conjunction with structural simulations. ...
This risk based approach means that some compounds that have very low overall mass emission contribution were assessed (eg Trimethylbenzene) since they have low acute or chronic health guidelines. 6.3 PAH'S PAHs are a complex class of organic compounds that consist of two or more fused aromatic...
Absorptions at the following wavelengths: 388.8, 388.9, 387.2 and 388.6 nm which are supported by absorption at 418.2, 509.6, 510.0, 449.4, 482.6 and 432.8 nm suggest the same classes of crude oil composition which is the presence of fused benzene rings or polynuclear aromatics in asphaltenes ...
In this study, we present a convenient and efficient method for the synthesis of novel, highly substituted 2-vinyl furans using a three-component reaction.
which are electron-rich σ-donor ligands that can strongly bond the metal centers in a manner similar to classical 2e donors such as phosphine ligands35,36,37. Another related example is the tantalum complexes derived from 1-iodo-2,6-di-p-tolylbenzene through lithiation and cyclometallation pr...
A concise, three-step synthesis of 1,4,8,11-substituted 2,3,9,10-tetrakis(methoxycarbonyl)pentacenes from commercially available 1,2,4,5-tetrakis(bromomethyl)benzene was established. Efficient alkynylation, followed by formation of four fused rings via a zirconacyclopentadiene intermediate, and ...