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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 2724699Generated: October 23, 2026

PyBOP

PYBOP · N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate · BOP REAGENT · Benzotriazole-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate · (BENZOTRIAZOL-1-YLOXY)TRIPYRROLIDINOPHOSPHONIUM HEXAFLUOROPHOSPHATE · BYPOP · BENZOTRIAZOLE-1-YL-OXY-TRIS-PYRROLIDINO-PHOSPHONIUM HEXAFLUOROPHOSPHATE · ((1H-Benzo[d][1,2,3]triazol-1-yl)oxy)tri(pyrrolidin-1-yl)phosphoniuM hexafluorophosphate(V)

https://huagongshe.com/en/chemical/2724699

PyBOP molecular structure

Identifiers & Physical Properties

CAS No.128625-52-5
Molecular formulaC18H28F6N6OP2
Average molar mass520.4 g/mol
Monoisotopic mass520.17040251 g/mol
SMILESF[P-](F)(F)(F)(F)F.c1ccc2c(c1)nnn2O[P+](N1CCCC1)(N1CCCC1)N1CCCC1
InChIKeyVIAFLMPQBHAMLI-UHFFFAOYSA-N
PubChem CID2724699
EC No.603-290-2
DTXSIDDTXSID40369209

Chemical & Physical Properties

Topological polar surface area49.7
Hydrogen bond donors0
Hydrogen bond acceptors13
Rotatable bonds5
Heavy atoms33
Formal charge0
Complexity500
Melting point154-156 °C (dec.)(lit.)
Density1.438 at 20℃
Vapor pressure0-0Pa at 20-50℃
Storage conditions2-8°C
Solubilitymethanol: 25 mg/mL, clear
Physical stateFine Crystalline Powder
ColorWhite to off-white
SensitivityMoisture Sensitive
BRN3584612
Major applicationspeptide synthesis
InChIInChI=1S/C18H28N6OP.F6P/c1-2-10-18-17(9-1)19-20-24(18)25-26(21-11-3-4-12-21,22-13-5-6-14-22)23-15-7-8-16-231-7(2,3,4,5)6/h1-2,9-10H,3-8,11-16H2/q+1
InChIKeyBYCLGHOAELJLOF-UHFFFAOYSA-M
SMILES[P+](ON1N=NC2C=CC=CC1=2)(N1CCCC1)(N1CCCC1)N1CCCC1.[P-](F)(F)(F)(F)(F)F
LogP (partition coefficient)-0.3 at 26℃ and pH3.5-3.7
CAS DataBase Reference128625-52-5(CAS DataBase Reference)
UNSPSC Code12352107
NACRESNA.22
GHS pictogramGHS07,GHS09
Signal wordWarning
GHS hazard statementsH302-H317-H410
GHS precautionary statementsP261-P264-P273-P280-P301+P312-P302+P352
Personal protective equipment (PPE)dust mask type N95 (US), Eyeshields, Gloves
Hazard symbolsXi
Risk statements (R)37/38-44-36/37/38
Safety statements (S)26-36-24/25-37/39
UN transport numberUN 1325 4.1/PG 2
Water hazard class (WGK)3
F8-10-21
Hazard NoteIrritant
Customs code29339980
Storage class11 - Combustible Solids
Hazard classAcute Tox. 4 OralAquatic Acute 1Aquatic Chronic 1Skin Sens. 1
REACH registrationsActive

Safety & Regulations

GHS classificationWarningH302 (14.9%): Harmful if swallowed [Warning Acute toxicity, oral]H315 (87.8%): Causes skin irritation [Warning Skin corrosion/irritation]H317 (12.2%): May cause an allergic skin reaction [Warning Sensitization, Skin]H319 (87.8%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]H335 (86.5%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposureRespiratory tract irritation]H410 (12.2%): Very toxic to aquatic life with long lasting effects [Warning Hazardous to the aquatic environment, long-term hazard]P261, P264, P264+P265, P270, P271, P272, P273, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P319, P321, P330, P332+P317, P333+P317, P337+P317, P362+P364, P391, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 74 reports by companies from 13 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website.
Regulatory informationStatus: Active Update: 24-05-2021 https://echa.europa.eu/registration-dossier/-/registered-dossier/30080Status: Active Update: 07-12-2018 https://echa.europa.eu/registration-dossier/-/registered-dossier/27481
Hazard Classes and CategoriesAcute Tox. 4 (14.9%)Skin Irrit. 2 (87.8%)Skin Sens. 1 (12.2%)Eye Irrit. 2 (87.8%)STOT SE 3 (86.5%)Aquatic Chronic 1 (12.2%)
F8-10-21
Personal protective equipment (PPE)dust mask type N95 (US), Eyeshields, Gloves
Water hazard class (WGK)3
UN transport numberUN 1325 4.1/PG 2
Customs code29339980
Risk statements (R)37/38-44-36/37/38
Signal wordWarning
GHS pictogramGHS07,GHS09
Hazard symbolsXi
hazard_noteIrritant
Safety statements (S)26-36-24/25-37/39
Storage class11 - Combustible Solids
GHS hazard statementsH302-H317-H410
REACH registrationsActive
Hazard classAcute Tox. 4 OralAquatic Acute 1Aquatic Chronic 1Skin Sens. 1
GHS precautionary statementsP261-P264-P273-P280-P301+P312-P302+P352

Applications & Uses

Uses

One of the most convenient coupling reagents for peptide synthesis without carcinogenic by-products. It replaces BOP reagent. This is especially suitable for solid-phase peptide synthesis, avoids racemization.

Uses

1H-Benzotriazol-1-yloxytri(1-pyrrolidinyl) phosphonium hexafluorophosphate (PyBOP) is a peptide coupling reagent utilized in solid phase peptide synthesis. It is also used as a substitute for the (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate (BOP) reagent.

Uses

PyBOP is a reagent for: Synthesis of single labeled oligonucleotides that fluoresce upon matched hybridization Generation of endocrine disruptor chemical binders Cycloaddition to template-assembled multivalent peptide conjugates

General Description

(Benzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate (PyBOP) is an activator of carboxyl group commonly used in peptide synthesis. It also participates in the carboxylic acid esterification. It shows characteristics similar to benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate (BOP) and can be utilized as an alternative to BOP in peptide bond formation.