Authors: J Xu¹; T Rosenau²; A H M Renfrew¹; D A S Phillips¹; E Maudru¹

Source: Coloration Technology, Volume 120, Number 6, 2004 , pp. 316-319(4)

Publisher: Society of Dyers and Colourists

Abstract:

Monofluorotriazinyl and 5-chloro-2,4-difluoropyrimidinyl dyes were each reacted, in turn, with trimethyl- and triethyl-amine in aqueous solution. Trimethylamine was quaternised by both the fluoroheterocyclic reactive dyes. In the case of the chlorodifluoropyrimidinyl dye, NMR spectroscopy showed that displacement of the C-2 fluorine atom had occurred. Triethylamine, on the other hand, failed to react with either fluoroheterocycle, strongly suggesting that the covalent bond formation reaction of DEAE-cotton, with a 5-chloro-2,4-difluoropyrimidinyl dye under neutral conditions, does not involve initial quaternisation. A mechanism involving the deprotonation of the cellulose hydroxy groups, catalysed by the basic groups in DEAE-cotton, is proposed. Received: 24 May 2004; Accepted: 3 September 2004.

Document Type: Regular paper

Affiliations: 1: Christian Doppler Laboratory for Cellulosic Fibre and Textile Chemistry, UMIST, PO Box 88, Manchester M60 1QD, UK 2: Christian Doppler Laboratory for Pulp Reactivity, Institute of Chemistry, University of Agricultural Sciences Vienna, Muthgasse 18, A-1190 Vienna, Austria

Publication date: 2004-01-01

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