36075-06-6Relevant articles and documents
Chemistry of heteroaryltriphenylphosphonium iodides: Preparation from iodoheteroaromatics and elimination of the phosphonium iodide group using basic solvents
Sato, Akihiro,Sugimoto, Osamu,Tanji, Ken-ichi
experimental part, p. 2735 - 2739 (2010/04/25)
α- and γ-Iodoheteroaromatics were found to react with triphenylphosphine to give heteroaromatictriphenylphosphonium iodides in excellent yields, β-lodoheteroaromatics, which are less reactive with triphenylphosphine compared to α- or γ-compounds, were con
Novel base-initiated reactions of N-substituted pyridinium salts
Umemoto, Teruo,Tomizawa, Ginjiro,Hachisuka, Hitoharu,Kitano, Masakatsu
, p. 161 - 168 (2007/10/03)
Reaction of N-fluoropyridinium triflate with a base in dichloromethane gave 2-chloropyridine as the major product along with 2-pyridyl triflate and 2-fluoropyridine, regardless of the nature of the base. This base-initiated reaction was also shown to take place similarly in other halogenated alkanes, ethers, a nitrile, aromatics, a ketone, vinyl ethers, alcohols and trimethylsilyl acetate as solvents to give pyridine derivatives substituted with a solvent molecule (s) at the 2-position. N-(Trifluoromethanesulfonyloxy)-and (benzenesulfonyloxy) pyridinium salts were found to undergo the same base-initiated reaction. These reactions may be explained by a postulated singlet carbene (canonical formula 11b) produced through proton abstraction of N-substituted pyridinium salts. A similar carbene reaction may thus likely occur in the thermal decomposition of thiatriazole 10. Ab initio MO calculations revealed the structure and properties of the labile deprotonated N-fluoropyridinium cation and supported the carbene intermediate reaction mechanism rather than a pyridynium or pyridyl cation mechanism. Quarroz's reports on the reactions of picolinic acid N-oxide and the reported reactions of pyridines with F2, CH3COOF or CsSO4F in solvents may be explained by this carbene mechanism.
BASE-INITIATED REACTIONS OF N-FLUOROPYRIDINIUM SALTS; A NOVEL CYCLIC CARBENE PROPOSED AS A REACTIVE SPECIES
Unemoto, Teruo,Tomizawa, Ginjiro
, p. 2705 - 2708 (2007/10/02)
A new type of base-initiated reactions of pyridinium salts was found and a novel cyclic carbene was proposed as the reactive species.