Aπ-conjugated polymer with 2,5-bis(benzoxazol-2′-yl)benzene-1,4-diol fluorene units is synthesized by using a SuzukiMiyaura coupling reaction (Mw = 1.3 ... Q Chu,DA Medvetz,Y Pang - 《Chemistry of Materials》 被引量: 75发表: 2014年 Synthesis and Photo-Physical Characteristics of ESIPT...
Formation of the very stable tropylium ion from a substituted benzene ring. VII. When dealing with a heteroatom, the adjacent C–C bond often is cleaved. The base peak and other major peaks present in a mass spectrum can be used to determine the presence of specific functional groups or ...
Electron impact fragmentation patterns were obtained for 1,4-bis[(5-perfluoro-n-heptyl)-1,2,4-oxadiazolyl]-benzene, its perfluoroalkylether substituted analogue, 3,5-bis(perfluoroalkyl)-, 3,5-bis(perfluoroalkylether)- and 3-perfluoroalkylether-5-perfluoroalkyl-1,2,4-oxadiazoles. In the ...
The mass spectra of the title compounds depend markedly on ring annulation. On ionization, the cis-annulated isomers lose alcohol and benzene regardless of the configuration of the alkoxyl. In the trans-annulated isomers, the fragmentation is governed by the configuration of both the aldehyde and ...
aof a pyrylium or benzene ring [10]. pyrylium或苯环(10)。[translate] a很抱歉在周末打扰您 Was sorry very much disturbs you in the weekend[translate] aHe has gone, leaving only a trace of sadness,he went to be in a hurry to depart,I did not imagine it happy but a little reluctant. ...
buten-3-ynyl-benzene are fundamentally correlated to each isomer; the co-existence of alternative isomers in the molecular beam would alter the shape of the PIE considerably31. Therefore, we conclude that naphthalene is the sole contributor to signal atm/zof 128 within our error limits. The ...
Currently, molDiscovery ignores these features and only covers a limited number of bond types and rearrangement rules, e.g., molDiscovery naively treats benzene ring or large resonant structures as alternate single bonds and double bonds. This could be improved by incorporating more complex ...
Pyrolysis mass spectra and gas chromatograms of plasma-polymerized benzene (PPB) and p-xylene (PPX) have been studied. Both polymers gave mass spectra that indicated the presence of disubstitution in an aromatic ring and of product molec... M Venugopalan,IS Lin,MS Grenda - 《Journal of Po...
[C6]-Labeled Ca and p-Co, [C12]-labeled Pin, [C18]-labeled pinoresinol monoglucoside (PMG), and [C18]-labeled PDG products were found when [C6]-labeled glu was used, demonstrating that the benzene ring and glucoside of PDG originated from glu. It was also determined that PMG was ...
Mitchell and Speight (1973) showed that an Athabasca bitumen (pentane) asphaltene was completely soluble in alkyl cycloalkanes, alkyl benzenes and common chlorinated solvents; they also precipitated asphaltenes in stages and showed that the heaviest asphaltenes precipitated first and contained the majority...