Patent ID: 11859026
Assignee: NOURYON CHEMICALS INTERNATIONAL B.V.
Field: Environmental technology (Chemistry)
Classification: CPC C | IPC C

Claim 17:
18. A composition comprising a functionalized pyranine of formula (IIa), wherein
R1 is selected from optionally substituted C1-C10alkyl, aryl-C2-C10alkyl, —C(O)—, —CH2NH—C(O)—, —C(CH3)2—NH—C(O)—,
R is optionally substituted C1-C10alkyl, and
M is selected from the group consisting of hydrogen, sodium, potassium, cesium, rubidium, lithium, ammonium, and tetralkylammonium,
wherein said composition comprises less than 5 mol % unfunctionalized pyranine, based on the total amount of unfunctionalized pyranine and functionalized pyranine.