In aromatic molecules such as benzene, the cyclic conjugated π-bond network contains 4n + 2 electrons, which makes the molecules remarkably stable.
A polystyrene (PSt) based macromonomer with a central benzene ring bearing cyclic boronic acid propanediol diester groups, synthesized by atom transfer radical polymerization (ATRP), was also used as partner for PTHF in the cross-coupling reaction.
The electrochemical reduction of [(hydroxy-sulfonyloxy)iodo] benzenes and some cyclic I III) and I V) compounds has been studied in aqueous neutral and acid solutions by employing polarography and rotating disk voltammetry.
A synthetic type apparatus was designed to measure hydrogen solubility in four pure aromatic or cyclic hydrocarbons, benzene, cyclohexane, toluene, and methylcyclohexane, and two equimolar binary mixtures, benzene + cyclohexane, and methylcyclohexane + toluene.
Appearance of an obvious inflection point in the course of benzene selectivity under the cyclic CH4-H2 feed switch operation mode revealed the two stages deactivation feature of the catalyst: the deactivation was first slow and then accelerated.
The effect of ligand coordinated with Fe ion was investigated by comparing the catalytic activities for oxidation of cyclic hydrocarbons (benzene, cyclohexane, and cyclohexene) over [Fe(bpy 3]2+@Na-Y, [Fe(phen)3]2+@Na-Y, and [Fe(terpy)2]2+@Na-Y (phen = 1,10-phenanthroline and terpy = 2,2′;6′,2″-terpyridine).
The dimers thus formed are held together by C H…π (NiCS2, chelate) interactions, sustaining a 2-D supramolecular architecture and constructing an unprecedented cyclic analog of benzene.
(They are so called after Friedrich August Kekulé, who is commonly credited with having first proposed the hexagonal structure for benzene in 1865; however, a cyclic structure had already been proposed by Joseph Loschmidt four years earlier).
In addition, exposure to solvents used in certain hobbies may result in higher cyclic exposure to benzene.
Pure mesoporous BEA zeolites without Pt metal nanoparticles converted methylcyclopentane to acyclic isomers via ring-opening and dehydrogenated version of methylcyclopentane as the major products, whereas Pt metal nanoparticle supported counterparts produced C6-cyclic products (cyclohexane, benzene) most dominantly.
