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1. (WO2001035107) FLUORESCENT COMPOUNDS FOR USE IN INDUSTRIAL WATER SYSTEMS

Pub. No.:    WO/2001/035107    International Application No.:    PCT/US2000/041786
Publication Date: Fri May 18 01:59:59 CEST 2001 International Filing Date: Thu Nov 02 00:59:59 CET 2000
IPC: C07D 471/04
G01N 33/18
Applicants: NALCO CHEMICAL COMPANY
Inventors: MORIARTY, Barbara, E.
REDDINGER, Jerry, L.
Title: FLUORESCENT COMPOUNDS FOR USE IN INDUSTRIAL WATER SYSTEMS
Abstract:
Fluorescent compounds of formula (I), wherein R1 and R2 are either both SO3M, or one of R1 and R2 is SO3M and the other is COOM, where M is selected from the group consisting of H, Na, K, Rb, Cs, Li or ammonium, are described and claimed. These inert fluorescent compounds have been found to be resistant to oxidizing biocides. One process for making these compounds is described and claimed as the condensation between a 1,8-naphthalic anhydride possessing the desired functionalities and the appropriately substituted o-phenylene diamine. Alternatively, o-amino-nitro-aromatics may be condensed with the various 1,8-naphthalic anhydrides when the in situ reduction of the nitro group is accomplished with a suitable reducing agent such as iron powder. The resulting fluorescent compounds can be used as inert fluorescent tracers in industrial water systems.