76192-30-8Relevant academic research and scientific papers
Electronic absorption spectra of pyrylium and benzodihydrochromenylium salts
Burov,Pchelintseva,Fedotova
scheme or table, p. 924 - 930 (2009/07/04)
The electronic absorption spectra of benzodihydrochromenylium, tetrahydrochromenylium, and dichloropyrylium salts were studied for the first time. It was noticed that intramolecular charge transfer takes place mainly between the substituent at position 4 of the pyrylium ring and the π-system of the cation as a whole, while the bathochromic shift depends substantially on the geometry of the molecule. It was shown that the chlorine atoms have an effect on the form of the spectra when they are introduced into the ring of the pyrylium cation and into the aryl substituents.
Halogenation of propanonyl-5,6-benzocyclohexan-1-ones
Tsimbalenko,Fedotova,Kharchenko
, p. 1673 - 1677 (2007/10/03)
Bromination and chlorination with phosphorus pentachloride of propanoyl-5,6-benzocyclohexan-1-one under different conditions was studied. It was established that basically existed a chance to obtain dibromo, tribromo, dichlorosubstituted condensed semicyclic 1,5-diketones. A process of heterocyclization was found to compete with halogenation. As a result of this side process which depends on the substituent character at the C3 atom of the aliphatic chain of dioxocompound formed benzohydrochromylium salt.
Pyrylium Mediated Transformations of Neopentylamine
Katritzky, Alan R.,Singh, Jagadish N.
, p. 421 - 424 (2007/10/02)
A series of 2,4-diphenyl-5,6-dihydrobenzochromenylium salts have been prepared.They react with neopentylamine to form the corresponding 1-neopentylquinolinium salts which on thermolysis afford neopentyl halides, trifluoracetate, and thiocyanate, in good yields without rearrangements.
Improved Methods for Conversion of Primary Amines into Bromides
Katritzky, Alan R.,Al-Omran, Fatima,Patel, Ranjan C.,Thind, Sukhpal S.
, p. 1890 - 1894 (2007/10/02)
N-Alkyl- and N-benzyl-4-p-chlorophenyl-2,3,5,6-tetraphenyl- N-alkyl- and N-benzyl-2,3,4,5,6-pentaphenyl-, and N-alkyl- and N-benzyl-2,4,6-triphenyl-pyridinium bromides on pyrolysis at 180-220 deg C give the corresponding alkyl and benzyl bromides in high yield. 1-Benzyl-5,6-dihydro-2,4-diphenylbenzoquinolinium trifluoromethanesulphonate gave benzyl bromide on heating with KBr in dimethylformamide at 100 deg C, and n-octyl bromide (80percent) was obtained from the corresponding pentacyclic bromide in refluxing acetonitrile.
