Describes the aromatic ring of nitrogens. Presence of cyclopentadienide anion in gas phase; Use of electrospray ionization method; Derivatives of pentazole.doi:10.1021/cen-v080n033.p008R. DaganiChemical & Engineering News (00092347)DaganiR.An aromatic ring of five nitrogens.AngewChemNews. ...
Second, the heteroaromatics that contain elements such as oxygen/nitrogen/sulphur connected to the aromatic ring (Type II) are also an important part, which contributes to the aromatic structure (Tromp and Moulijn, 1988; Wender, 1976). Benzofuran, phenol, anisole are some examples which fall ...
We analyzed aromatic and magnetic properties of two typical expanded porphyrins, sapphyrin and orangarin, using our theory of aromaticity and ring-current diamagnetism and confirmed that, as in the case of free-base porphine, global aromaticity and macrocyclic circulation are associated primarily with...
Ring Systems with at least Two Fused Heterocyclic Five- or Six-membered Rings with no Bridgehead Heteroatom M.H.Elnagdi, ...I.A.Abdelhamid, inComprehensive Heterocyclic Chemistry III, 2008 10.12.4.4Aromaticity As has been indicated in CHEC-II<1996CHEC-II(7)431>,aromatic compoundsare thosepolye...
Various approaches to the synthesis of different selenaaromatic ring systems are presented. A number of selenaaromatic compounds and their nonconjugated analogs are indicated as reagents and catalysts for organic synthesis, as biological response modifiers of practical importance as pharmaceuticals, and as...
Anodic mono- and difluorination of aromatic thioethers Aromatic thioethers substituted on the phenyl ring with strongly electron﹚ithdrawing groups can be monoand difluorinated by electro﹐xidation in acetonitr... Baroux,Patrick - 《Journal of the Electrochemical Society》 被引量: 4发表: 1997年 ...
A redox active polycyclic aromatic hydrocarbon (PAHs) composed of azulene and pyrroles was developed by a research team at Ehime University. This nitrogen-embedded PAH contains two kinds of aromatic rings in the dicationic state which can stabilize catio
Concerning the effects of aromatic ring fluorination on the cation--pi interaction and other... Ngola,S.M.,Dougherty,D.A.Concerning the effects of aromatic ring fluorination on the Cation-π interaction and other molecular recognition phenomena in ... Ngola,Sarah,M.,... - 《Journal of ...
This fact can be explained by the fact that the octatetraene ring does not satisfy Hückel’s rule of aromaticity. Figure 2 and Figure 3 show that with an increase in the number of benzene or heterocyclic rings annelating the octatetraene ring, the BREs have negative values only for the ...
Organic heterocyclic compounds consisting of a six-membered ring with two nitrogen atoms separated by one carbon in pyrimidine and two carbons in pyrazine. radical An atom or group of atoms possessing an odd (unpaired) electron. View chapterExplore book Pteridines S.C. Daubner, P.F. Fitzpatrick...