Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate

Also known as: PyBOP, PYBOP, Benzotriazole-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate, (1H-Benzotriazol-1-yloxy)(tripyrrolidin-1-yl)phosphonium hexafluorophosphate, 1H-Benzotriazol-1-yloxytripyrrolidinophosphonium hexafluorophosphate, Benzotriazol-1-yloxytripyrrolidinophosphonium hexafluorophosphate, Castro's reagent

Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate (CAS 128625-52-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C18H28F6N6OP2 and a molecular weight of 520.39200 g/mol. Key property: a melting point of 154-156 °C (dec.)(lit.). It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 128625-52-5
Jingsj CID: J-1099088-2
Molecular Formula: C₁₈H₂₈F₆N₆OP₂
Molecular Weight: 520.39200 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	154-156 °C (dec.)(lit.)
Exact Mass	520.17000
PSA	76.84000
LogP	6.02100
Additional Property	methanol: 25 mg/mL, clear

GHS Safety & Compliance

IrritantSignal word: Warning

H315 — Causes skin irritation
H319 — Causes serious eye irritation
H335 — May cause respiratory irritation

Frequently Asked Questions

What is the CAS number of Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate?

The CAS number of Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate is 128625-52-5.

What are the molecular formula and molecular weight of Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate?

Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate has molecular formula C18H28F6N6OP2 and molecular weight 520.39200 g/mol.

Is Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate hazardous?

Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate?

For Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate, Upstream Products: 1,1',1''-Phosphoryltripyrrolidine, 1-Hydroxybenzotriazole; Downstream Products: 1,1',1''-Phosphoryltripyrrolidine, Bromo-tris-pyrrolidino-phosphonium hexafluorophosphate, 1-Boc-N-methoxy-N-methylpiperidine-3-carboxamide.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate (CAS 128625-52-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1099088-2 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.