Bis(trimethylsilyl)tributyltin phosphate

Also known as: Tributylstannyl bis(trimethylsilyl) phosphate, Bis[(trimethylsilyl)tributyl]stannyl phosphate, tri-n-butylstannyl bis(trimethylsilyl)phosphate, Bis(trimethylsilyl)-tributylstannyl phosphate, 3,5-Dioxa-4-phospha-2-sila-6-stannadecane, 6,6-dibutyl-2,2-dimethyl-4-[(trimethylsilyl)oxy]-, 4-oxide

Bis(trimethylsilyl)tributyltin phosphate (CAS 74785-85-6) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C18H45O4PSi2Sn and a molecular weight of 531.39300 g/mol. Key properties include a boiling point of 423.7ºC at 760 mmHg and a flash point of >110.0 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H312 — Harmful in contact with skin and H315 — Causes skin irritation. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.

CAS No.: 74785-85-6
Jingsj CID: J-26661-5
Molecular Formula: C₁₈H₄₅O₄PSi₂Sn
Molecular Weight: 531.39300 g/mol
Category: Organic Acids
Last updated: 11/3/2026

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Physicochemical Properties

Boiling Point	423.7ºC at 760 mmHg
Flash Point	>110.0 °C
Exact Mass	532.16200
PSA	54.57000
LogP	8.15990
Storage Conditions	2-8°C

GHS Safety & Compliance

Acute Toxicity / Health Hazard / Environmental HazardSignal word: Danger

H301 — Toxic if swallowed
H312 — Harmful in contact with skin
H315 — Causes skin irritation
H319 — Causes serious eye irritation
H372 — Causes damage to organs through prolonged exposure
H410 — Very toxic to aquatic life with long lasting effects

Frequently Asked Questions

What is the CAS number of Bis(trimethylsilyl)tributyltin phosphate?

The CAS number of Bis(trimethylsilyl)tributyltin phosphate is 74785-85-6.

What are the molecular formula and molecular weight of Bis(trimethylsilyl)tributyltin phosphate?

Bis(trimethylsilyl)tributyltin phosphate has molecular formula C18H45O4PSi2Sn and molecular weight 531.39300 g/mol.

Is Bis(trimethylsilyl)tributyltin phosphate hazardous?

Bis(trimethylsilyl)tributyltin phosphate has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H312 — Harmful in contact with skin; H315 — Causes skin irritation.

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

Last updated: 11/3/2026

How to cite: Jingsj. "Bis(trimethylsilyl)tributyltin phosphate (CAS 74785-85-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-26661-5 (accessed 2026-11-09).

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