and sulfur, and H4 is very similar to thiopyrylium, but is slightly lower. NMR for 13C has the same trends as for the attached hydrogens. Solvents include trifluoroacetic acid, methanol, dichloromethane, chloroform, and acetonitrile. Derivatives Many derivatives of selenopyrylium are known with side chains attached to carbons 2, 3, or 6. Examples include 4-(p-dimethylaminophenyl)selenopyridinium, 2,6-diphenylselenopyridinium, 4-methyl-2,6-diphenylselenopyrylium, 2,4,6-triphenylselenopyrylium, 2,6-diphenyl-4-(p-dimethylaminophenyl)selenopyrylium, and 2,6-di-tert-butylselenopyrylium. Related When the ring is fused with other aromatic rings, larger aromatic structures such as selenochromenylium, selenoflavylium, and selenoxanthylium result. See also 6-membered aromatic rings with one carbon replaced by another group: borabenzene, silabenzene, germabenzene, stannabenzene, pyridine, phosphorine, arsabenzene, stibabenzene, bismabenzene, pyrylium, thiopyrylium, selenopyrylium, telluropyrylium References Heterocyclic compounds with 1 ring Organoselenium compounds Aromatic compounds Cations Six-membered rings Selenium(−II) compounds