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Kinetic study of the iodine monobromide-or iodine monochloride-catalyzed alcoholysis of butoxytriethylsilane: n-butoxy group — s-butoxy group exchange reaction

✍ Scribed by Katsuko Ito; Takeshi Ibaraki

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
285 KB
Volume
21
Category
Article
ISSN
0538-8066

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✦ Synopsis

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 monochloride, on reaction mixtures containing both butanols in excess

The catalytic coefficients of both catalysts were evaluated from the observed rate constants as follows: kzIBr = 9.5 X 10' exp(-54.8 X 103/RT) k-21Br = 12.3 X lo8 eXp(-53.3 X 1O3/RT) kzlcl = 10.7 x 108exp(-54.6 x 103/RT) k-zIcr = 13.2 x 1 0 ' exp(-53.1 x 103/RT)

The activation parameters were estimated from these data, and were compared with the values for iodine catalysis. These results are consistent with the mechanism previously proposed.

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Kinetic study of the iodine-catalyzed al
Kinetic study of the iodine-catalyzed alcoholysis of Butoxytriethylsilane: n-butoxy group—s-butoxy group exchange reaction
✍ Katsuko Ito; Takeshi Ibaraki 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 347 KB

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

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°,