76017-39-5Relevant academic research and scientific papers
Trifluoromethanesulphonic Acid as Cyclodehydrating Agent: Synthesis of Nitrogen Heterocycles via 5,6-Dihydro-2,4-diphenylpyrylium Cation
Elshafie, Sayed Mahmoud M.
, p. 586 - 588 (2007/10/02)
N-Substituted 5,6-dihydro-2,4-diphenylnaphtho-pyridinium triflates (5a-q) have been prepared in high yields by the condensation of 5,6-dihydro-2,4-diphenylnaphthopyrylium triflate (4) with different amines.The pyrylium salt (4) in turn can b
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.
The Preparation of 2,4,6-Triphenylpyrylium Trifluoromethanesulphonate, Fluorosulphonate, Ethoxysulphonate, Naphthalene-2-sulphonate, Stannochloride, Trichloroacetate, and Trifluoroacetate and other Pyrylium Trifluoromethanesulphonates and their Reactions
Katritzky, Alan R.,El-Mowafy, Azzahra M.,Marzorati, Liliana,Patel, Ranjan C.,Thind, Sukhpal S.
, p. 4001 - 4030 (2007/10/02)
The title pyrylium salts are all readily prepared in high yield from 1,3,5-triphenylpent-2-ene-1,5-dione.Amines react with the trifluoromethanesulphonate, naphthalene-2-sulphonate, and trifluoroacetate to give the corresponding pyridinium salts in high yi
