33913-79-0Relevant academic research and scientific papers
Continuous-Flow Synthesis of Pyrylium Tetrafluoroborates: Application to Synthesis of Katritzky Salts and Photoinduced Cationic RAFT Polymerization
Sambiagio, Carlo,Ferrari, Matteo,Van Beurden, Koen,Ca', Nicola Della,Van Schijndel, Jack,Noel, Timothy
supporting information, p. 2042 - 2047 (2021/04/05)
Katritzky salts have emerged as effective alkyl radical sources upon metal- or photocatalysis. These are typically prepared from the corresponding triarylpyrylium ions, in turn an important class of photocatalysts for small molecules synthesis and photopolymerization. Here, a flow method for the rapid synthesis of both pyrylium and Katrizky salts in a telescoped fashion is reported. Moreover, several pyrylium salts were tested in the photoinduced RAFT polymerization of vinyl ethers under flow and batch conditions.
Kinetics and Mechanisms of Nucleophilic Displacements with Heterocycles as Leaving Groups. 2. N-Benzylpyridinium Cations: Rate Variation with Steric Effects in the Leaving Group
Katritzky, Alan R.,El-Mowafy, Azzahra M.,Musumarra, Giuseppe,Sakizadeh, Kumars,Sana-Ullah, Choudhry,et al.
, p. 3823 - 3830 (2007/10/02)
N-Benzyl groups are transferred to piperidine from pyridinium ions by unimolecular SN1 and/or bimolecular SN2 mechanisms.Steric acceleration by α-phenyl groups is reduced by an adjacent β-methyl group but increased by constraining th
Boron Trifluoride as a Cyclodehydrating Agent: Synthesis of Nitrogen Heterocycles via Pyrylium Tetrafluoroborates
Elshafie, Sayed M. M.
, p. 427 - 428 (2007/10/02)
Pyrylium cations (1-12,Z = O+) have been prepared in high yields by the interaction of chalkones (in slight excess) and different ketones using BF3-etherate as cyclodehydrating agent or from 1,5-diketones in the presence of HBr and chalkone as hydrogen abstractor.The pyrylium cations have been converted into the corresponding nitrogen heterocycles (1-12;Z=N).
