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Homogeneous models for the chemical selectivity of reactive dyes on cotton‐development of procedures and choice of model
Author(s) -
Bentley T William,
Ratcliff Joanne,
Renfrew A Hunter M,
Taylor John A
Publication year - 1995
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1995.tb01744.x
Subject(s) - homogeneous , selectivity , chemistry , biochemical engineering , combinatorial chemistry , biological system , organic chemistry , mathematics , engineering , biology , catalysis , combinatorics
Rates and products of reactions of a dichlorotriazine dye (CI Reactive Orange 4) with a range of alcohols (methanol, propan‐1‐ol, propan‐2‐ol, tetrahydropyran‐2‐methanol, ethane‐1,2‐diol, α‐and ß‐methylglucopyranosides, mannitol and sorbitol) have been investigated in dilute aqueous solution at pH 11.0 and 25.0d̀C by ion‐pair HPLC. The pseudo‐first‐order rate constants have been separated into contributions from the competing hydrolysis and alcoholysis reactions. Addition of alcohol increases the rates of both hydrolysis and alcoholysis reactions. Product selectivity increases from 74 for 0.132 mol/l propan‐1‐ol to 2400 for 0.132 mol/l mannitol and differs even for stereoisomers. It is concluded that, despite its simplicity, methanol is a suitable model alcohol for probing the major factors influencing the chemical selectivity of reactive dyes in homogeneous solutions