Detail of "625-99-0"

Reference

Kinetics and mechanism of the radical-induced deiodination of aryl iodides by methoxide ions

Kinetics and mechanism of the radical-induced deiodination of aryl iodides by methoxide ions. Tomaselli, Gaetano A.; Bunnett, Joseph F. (Univ. California, Santa Cruz, CA 95064, USA). J. Org.Some commonly used reagents like 625-99-0 and 124-41-4 are used in this experiment. Chem., 57(9), 2710-16 (English) 1992. CODEN: JOCEAH. ISSN: 0022-3263. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Kinetic study of the deiodination of m-chloroiodobenzene (to chlorobenzene and iodide ion), as effected by sodium or potassium methoxide in methanol, with initiation by thermolysis of AIBN, reveals kinetic orders 1.0 in aryl iodide and 0.5 in AIBN. The reaction is 0.86 order in potassium methoxide, but the dependence of rate on sodium methoxide concn. is less easily stated. Nitrobenzene inhibits the reaction. At high inhibitor concns., the kinetic order in nitrobenzene approaches -1 and concomitantly the kinetic order in AIBN approaches unity. These and related features of kinetic behavior fail to disqualify the radical chain mechanism with electron-transfer steps that has been proposed for this reaction. .

Ionic nucleophilic substitution in halobenzene-NH3 complexes: the entrance channel

Ionic nucleophilic substitution in halobenzene-NH3 complexes: the entrance channel. Dedonder-Lardeux, C.; Jouvet, C.; Martrenchard-Barra, S.; Solgadi, D.; Dimicoli, I. (Lab. Photophysique Moleculaire du CNRS, Bat. 213, Universite Paris-Sud, Orsay 91405, Fr.).There are some reagents with their cas registry numbers 625-99-0 and 186489-47-4 are used in this study. Chemical Physics Letters, 264(6), 596-604 (English) 1997 Elsevier. CODEN: CHPLBC. ISSN: 0009-2614. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Nucleophilic substitution reactions have been studied in halobenzene cations with ammonia. In ionic 1-1 complexes, three behaviors can be obsd., depending on the nature of the halogen atom X (F, Cl, Br or I): (i) no reactivity, (ii) X× elimination: X-Bz+-NH3 ? Bz-NH3+ + X×, (iii) HX elimination: X-Bz+-NH3 ? Bz-NH2+ + HX. We propose a reactive potential energy surface in which the two eliminations proceed through the same entrance channel: the formation of an addn. s complex after a barrier crossing. This should be the key point for interpreting the ensemble of previous results. The reaction time for this barrier crossing has been estd. using the RRK formalism, giving a set of consistent barriers for s complex formation in each halogenated compd. studied from a comparison of modeling and exptl. results. .