Metastable peak characteristics have been applied to study the fragmentation behaviour of the molecular ions and the high intensity fragment ions of the ortho- and meta-xylene isomers after electron impact. Metastable peaks for the fragmentation of ions generated by field ionization have also been ...
Xylene exists in three different isomeric forms. These isomers can be distinguished by the designations ortho- (o-), meta- (m-) and para- (p-), that specify to which carbon atoms (of the benzene ring) the two methyl groups are attached. By counting the carbon atoms around the ring st...
Structure and thermal decomposition of para- and ortho-xylene on Pt(111): a HREELS, LEED and TPD studyStructure and thermal decomposition of para- and ortho-xylene on Pt(111): a HREELS, LEED and TPD studyHigh resolution electron energy loss spectroscopy (HREELS), thermal desorption spectroscopy...
A number of monosubstituted derivatives of benzene have common names of long standing that have been absorbed into the IUPAC system. Examples includetoluene(C6H5CH3) andstyrene(C6H5CH=CH2). Disubstituted derivatives of benzene may have their substituents in a 1,2 (ortho, oro), 1,3 (meta, ...
ZEOLITE ZSM-5 (ref. 1) is a member of a new class of shape selective catalysts with unique channel structures which differ from the familiar large-pore faujasite and small-pore zeolites such as Linde Type A and erionite. They also possess unusual catalyt
Phosphorus pentoxide/methanesulphonic acid (PPMA) was used as both solvent and condensing agent for the preparation of polynaphthimidazoles (PNIs) through ... YH Kuo,LW Chen - 《Polymer International》 被引量: 8发表: 1996年 Oxidation of naphthalene to 1,4-naphthoquinone and phthalic anhydride ...
Moreover, the position of the alky groups (ortho-, meta-, para-) on the ring also influenced SOA chemical composition, with m-xylene and m-ethyltoluene has a higher 43/44 ratio compare to other isomers of xylene and ethyltoluene. The ToF-HR-AMS data, combined with SOA formation potential...
Mulberry Diels–Alder-type adducts (MDAAs), characteristic constituents of mulberry trees (Morusplants of the family Moraceae), are a group of structurally unique natural phenolic compounds biosynthetically derived from the intermolecular [4 + 2]-cycloaddition of dienophiles (mainly chalcones) and...
This process provides an almost ideal tissue-engineering scaffold, especially for blood vessel engineering due to the nanometer-scale dimension that physically resembles the natural material but has the advantage of biodegradability. Poly(ortho-esters) Poly(ortho-esters) are unique polymeric structures ...
The core of the cluster II is an angular metal chain Re2Fe with equal Re Fe bond lengths of 2.671(2) and nonbonding Re(1)Re(2) distances of 3.893(7) . Reaction of I with Cp2Ni in refluxing o-xylene results in formation of the heterometallic cluster Cp2Ni2Re2(CO)6(μ4-PHC ...