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Kinetic study of the iodine-catalyzed alcoholysis of Butoxytriethylsilane: n-butoxy group—s-butoxy group exchange reaction

✍ Scribed by Katsuko Ito; Takeshi Ibaraki

Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
347 KB
Volume
19
Category
Article
ISSN
0538-8066

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✦ Synopsis

In order to appreciate the excellent catalytic effect of iodine on the alcoholyses of alkoxysilanes more precisely, the rates of the reaction, Et3SiOBu" + Bu"0H : Et,SiOBu' + Bu"OH, were determined at various iodine concentrations.

Both forward and reverse reactions are first order with respect to butoxysilane and t o butanol, and pseudo first-order rate constants were measured at 40", 30", and 20°C on reaction mixtures containing both butanols in excess by means of gas-liquid chromatography. The observed rate constants as a function of iodine concentration gave linear relationships, and from these data the catalytic coefficients of iodine were evaluated: k,,, = 7.4 x lo7 exp (-55.7 x 103/RT) (forward reaction) k.~,,, = 9.7 x lo7 exp (-54.3 x 103/RT) (reverse reaction)

The enthalpies and the entropies of activation were estimated to be 53.2 kJ mol-', --lo3 J K-' mol-' (forward, 30°C) and 51.8 kJ mol I , -100 J K-' m o l ~ (reverse, 30°C).

📜 SIMILAR VOLUMES

Kinetic study of the iodine monobromide-
Kinetic study of the iodine monobromide-or iodine monochloride-catalyzed alcoholysis of butoxytriethylsilane: n-butoxy group — s-butoxy group exchange reaction
✍ Katsuko Ito; Takeshi Ibaraki 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 285 KB

The catalytic activity of iodine monobromide and iodine monochloride were investigated in the reaction, Et,SiOBu" + Bu'OH Et,SiOBus + Bu"0H. Pseudo first-order rate constants were measured by gas chromatography, at lo", 20", 30", and 40°C for iodine monobromide and at lo", 20", and 30°C for iodine m

Kinetic study of the bromine-catalyzed a
Kinetic study of the bromine-catalyzed alcoholysis of butoxytriethylsilane: n-Butoxy group–s-butoxy group exchange reaction
✍ Katsuko Ito; Takeshi Ibaraki 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 267 KB

## Abstract In order to compare the catalytic activity of bromine with those of iodine and iodine monohalides, kinetic studies on the reaction, Et~3~SiOBu^__n__^ + Bu^__s__^OH ⇌ Et~3~SiOBu^__s__^ + Bu^__n__^OH, were undertaken. Pseudo first‐order rate constants were determined at 0°, 10°, 15°, 20°,