Phthalimidoperoxycaproic acid

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Phthalimidoperoxycaproic acid
Phthalimidoperoxycaproic acid.svg
Preferred IUPAC name
6-(1,3-Dioxo-1,3-dihydro-2H-isoindol-2-yl)hexaneperoxoic acid
3D model (JSmol)
ECHA InfoCard 100.101.039 Edit this at Wikidata
EC Number
  • 410-850-8
  • InChI=1S/C14H15NO5/c16-12(20-19)8-2-1-5-9-15-13(17)10-6-3-4-7-11(10)14(15)18/h3-4,6-7,19H,1-2,5,8-9H2
  • C1=CC=C2C(=C1)C(=O)N(C2=O)CCCCCC(=O)OO
Molar mass 277.276 g·mol−1
GHS labelling:
GHS02: FlammableGHS05: CorrosiveGHS09: Environmental hazard[1]
H242, H318, H400
P210, P220, P234, P273, P280, P305+P351+P338, P310, P370+P378, P391, P403+P235, P411, P420, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Phthalimidoperoxycaproic acid (ε- or 6-(phthalimido)peroxyhexanoic acid, abbreviated as PAP) is a synthetic organic peroxy acid derived from caprolactam and phthalic anhydride.[2] The compound is mainly used as a preformed bleaching agent, alternatively to or together with hydrogen peroxide, in moderate laundry conditions of pH and temperature.[2] It is also used as a tooth whitening agent.[3] PAP is a white odorless crystalline powder at room temperature. It is slightly soluble in water and a strong oxidizer.[2][4]


  1. ^ CID 9860421 from PubChem
  2. ^ a b c Zoller, Uri (2008-10-29). Handbook of Detergents, Part E: Applications. CRC Press. pp. 378–379. ISBN 9781420018165.
  3. ^ Bizhang, Mozhgan; Domin, Julia; Danesh, Gholamreza; Zimmer, Stefan (2017). "Effectiveness of a new non-hydrogen peroxide bleaching agent after single use - a double-blind placebo-controlled short-term study". Journal of Applied Oral Science. 25 (5): 575–584. doi:10.1590/1678-7757-2016-0463. ISSN 1678-7757. PMC 5804394. PMID 29069156.
  4. ^ EP 1523474, "Crystalline forms of imidoalkanpercarboxylic acids", issued 2003-07-08