Kinetic data computation from thermogravimetric curves of some aryliodine(III) dicarboxylates

Thermal Stability of N-Heterocycle-Stabilized Iodanes – A Systematic Investigation

“…After completion of reaction, the solvent was removed under reduced pressure and the solid product was washed with diethyl ether several times then dried in vacuum to give 469 mg (91%) of compound 18 as a white solid: mp 206−207 °C decomp; 1 H NMR (400 MHz, DMSO-d6) δ = 8.29 (dd, J = 7.6, 1.6 Hz, 1H), 7.75 (td, J = 7.2, 0.8 Hz, 1H), 7.68 (td, J = 7.2, 2.0 Hz, 1H), 7.37 (s, 2H), 6.80 (dd, J = 8.0, 0.8 Hz, 1H), 2.50 (s, 6H), 2.41 (s, 3H). 13 The pseudocyclic salt (20 mg) has been added to a Schlenk tube under argon atmosphere and slowly heated up to 185 o C during 1 hour. After 10 minutes the melted solid has been cooled to room temperature.…”

“…Even though aryl- 3 -iodanes are viewed as safe and stable under ambient temperatures, systematic thermal degradation studies of hypervalent iodine reagents are still rare. In 1992 Varvoglis and co-workers investigated the thermal degradation of a variety of aryliodine(III) dicarboxylates into alkyl and aryl radicals through thermogravimetry [13,14]. In 2013 Kumar and coworkers compared the thermal properties of open-chained aryl- 3 iodanes with their polymer bound derivatives and found an endothermic decomposition behavior [15].…”

“…1 H-NMR (CDCl3, 600 MHz) δ (ppm) 12.39 (s, 1H), 7.86 (dd, J = 7.6, 1.7 Hz, 1H), 7.57 (t, J = 7.4 Hz, 1H), 7.20 (t, J = 7.8 Hz, 1H), 7.17 (s, 2H), 6.77 (d, J = 8.4 Hz, 1H), 6.48 (s, 1H), 2.52 (s, 6H), 2.43 (s, 6H) 13. C-NMR (CDCl3, 151 MHz): δ (ppm) 147.1, 144.9, 143.9, 142.7, 132.2, 131.1, 130.8, 130.2, 129.2, 127.4, 120.6 (q, J = 319.7 Hz), 118.0, 108.2, 100.9, 26.7, 21.4, 11.1.…”

Thermal stability of N-heterocycle-stabilized iodanes – a systematic investigation

“…Albeit aryl-λ 3 -iodanes are viewed as safe and stable under ambient temperatures, systematic thermal degradation studies of hypervalent iodine reagents are still rare. In 1992 Varvoglis and co-workers investigated the thermal degradation of a variety of aryl iodine(III) dicarboxylates into alkyl and aryl radicals through thermogravimetry [16–17]. In 2013 Kumar and co-workers compared the thermal properties of open-chained aryl-λ 3 -iodanes with their polymer bound derivatives and found an endothermic decomposition behavior [18].…”

A Tribute to Prof. Anastasios Varvoglis

“…Professor Varvoglis with co-workers and collaborators published several papers devoted to structural characterization of different classes of hypervalent iodine compounds and their physico-chemical properties. [65][66][67][68][69][70][71] In addition, the electrochemical reduction of hypervalent iodine compounds was investigated.…”