ACTIVATION OF CLAYZIC AND ITS EFFECT ON THE RELATIVE RATES OF BENZYLATION OF AROMATIC SUBSTRATES

S J  BARLOW; T W  BASTOCK; J H  CLARK; S R  CULLEN

ACTIVATION OF CLAYZIC AND ITS EFFECT ON THE RELATIVE RATES OF BENZYLATION OF AROMATIC SUBSTRATES

S J BARLOW, T W BASTOCK, J H CLARK, S R CULLEN

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

The effects of the activation of K10 montmorillonite supported zinc chloride ('Clayzic') by different methods on the reactivity of the catalyst in the Friedel-Crafts benzylation of benzene and halobenzenes have been investigated. There is an optimum temperature for thermal activation in air at which point a rate enhancement, compared to unactivated Clayzic, in the benzylation of benzene of greater than 30 has been achieved. The rate limiting factor for these reactions is believed to be the ability of the aromatic substrate to enter the polar mesopores containing the active zinc ions in Clayzic, causing unexpected and activation-dependent rate trends to be observed. Activation of Clayzic is believed to reduce the polar nature of the pores, so aiding partitioning of the substrate into the catalyst.

Original language	English
Pages (from-to)	411-414
Number of pages	4
Journal	JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
Issue number	3
Publication status	Published - Mar 1994

Keywords

ZNCL2 ALKYLATION CATALYSTS
MONTMORILLONITE
SUPPORTS

Cite this

@article{c58f853f0db347f0a52878d334d00894,

title = "ACTIVATION OF CLAYZIC AND ITS EFFECT ON THE RELATIVE RATES OF BENZYLATION OF AROMATIC SUBSTRATES",

abstract = "The effects of the activation of K10 montmorillonite supported zinc chloride ('Clayzic') by different methods on the reactivity of the catalyst in the Friedel-Crafts benzylation of benzene and halobenzenes have been investigated. There is an optimum temperature for thermal activation in air at which point a rate enhancement, compared to unactivated Clayzic, in the benzylation of benzene of greater than 30 has been achieved. The rate limiting factor for these reactions is believed to be the ability of the aromatic substrate to enter the polar mesopores containing the active zinc ions in Clayzic, causing unexpected and activation-dependent rate trends to be observed. Activation of Clayzic is believed to reduce the polar nature of the pores, so aiding partitioning of the substrate into the catalyst.",

keywords = "ZNCL2 ALKYLATION CATALYSTS, MONTMORILLONITE, SUPPORTS",

author = "BARLOW, {S J} and BASTOCK, {T W} and CLARK, {J H} and CULLEN, {S R}",

year = "1994",

month = mar,

language = "English",

pages = "411--414",

journal = "JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2",

issn = "0300-9580",

publisher = "Chemical Society",

number = "3",

}

TY - JOUR

T1 - ACTIVATION OF CLAYZIC AND ITS EFFECT ON THE RELATIVE RATES OF BENZYLATION OF AROMATIC SUBSTRATES

AU - BARLOW, S J

AU - BASTOCK, T W

AU - CLARK, J H

AU - CULLEN, S R

PY - 1994/3

Y1 - 1994/3

N2 - The effects of the activation of K10 montmorillonite supported zinc chloride ('Clayzic') by different methods on the reactivity of the catalyst in the Friedel-Crafts benzylation of benzene and halobenzenes have been investigated. There is an optimum temperature for thermal activation in air at which point a rate enhancement, compared to unactivated Clayzic, in the benzylation of benzene of greater than 30 has been achieved. The rate limiting factor for these reactions is believed to be the ability of the aromatic substrate to enter the polar mesopores containing the active zinc ions in Clayzic, causing unexpected and activation-dependent rate trends to be observed. Activation of Clayzic is believed to reduce the polar nature of the pores, so aiding partitioning of the substrate into the catalyst.

AB - The effects of the activation of K10 montmorillonite supported zinc chloride ('Clayzic') by different methods on the reactivity of the catalyst in the Friedel-Crafts benzylation of benzene and halobenzenes have been investigated. There is an optimum temperature for thermal activation in air at which point a rate enhancement, compared to unactivated Clayzic, in the benzylation of benzene of greater than 30 has been achieved. The rate limiting factor for these reactions is believed to be the ability of the aromatic substrate to enter the polar mesopores containing the active zinc ions in Clayzic, causing unexpected and activation-dependent rate trends to be observed. Activation of Clayzic is believed to reduce the polar nature of the pores, so aiding partitioning of the substrate into the catalyst.

KW - ZNCL2 ALKYLATION CATALYSTS

KW - MONTMORILLONITE

KW - SUPPORTS

M3 - Article

SN - 0300-9580

SP - 411

EP - 414

JO - JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2

JF - JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2

IS - 3

ER -