Does CAS 998-40-3 always mean pure tri-n-Butylphosphine?

Not necessarily. Offers may report tri-n-Butylphosphine separately from total Tributylphosphine isomers, so the active n-isomer and total-isomer assays can differ. State the required isomer basis, assay method and whether an isomer mixture is acceptable.

Is Tributylphosphine supplied neat or as a solvent solution?

Both forms are available. Neat material and solutions in NMP or another stated solvent have different active concentrations, handling and dosing. Specify concentration, solvent, water limit, quantity and process compatibility, and require the quotation to identify the supply form.

Which specifications should be agreed for Tributylphosphine?

Confirm assay, phosphine-oxide limit, water, color, inert-gas filling and the packaging closure system. For process use, also state the maximum acceptable oxygen or oxide content and the analytical method so that the batch analysis and technical data can be compared to the offered grade.

What are the key physical properties of Tributylphosphine?

Tributylphosphine is a clear, air-sensitive liquid with molecular formula C12H27P, molar mass about 202.32 g/mol, density about 0.81 g/mL at 25 C and melting point around -65 C. Its boiling point is commonly reported around 240-242 C at atmospheric pressure or about 150 C at 50 mmHg.

How should Tributylphosphine be stored and handled?

Keep in tightly closed containers under inert gas in a cool, well-ventilated area away from air, oxygen, heat, sparks and oxidizing or halogenated materials. Use dry, inerted transfer equipment, follow the current safety information, and maintain spill and fire controls appropriate for a pyrophoric or air-sensitive phosphine.

Tributylphosphine CAS 998-40-3

Tributylphosphine, also called tri-n-butylphosphine, is a tertiary phosphine identified by CAS 998-40-3. It may be evaluated as a reactive phosphine reagent for organophosphorus synthesis when the intended process and handling controls are defined. For an RFQ, state the reactive-phosphine process, required specification, quantity, packaging and destination.

CAS: 998-40-3
Synonyms: Tributylphosphine; Tri-n-butylphosphine; Tributylphosphane; PBu3
Einecs: 213-651-2
Molecular Formula: C₁₂H₂₇P
Grade: State the required product-specific specification for the intended process.
Package: State packaging and handling requirements for the product and destination.

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Product Description

Product name	Tributylphosphine
Synonyms	Tributylphosphine; Tri-n-butylphosphine; Tributylphosphane; PBu3
CAS Number	998-40-3
Molecular formula	C₁₂H₂₇P
Molar mass	202.32 g/mol

Physical-property requirements: confirm them against the current product-specific specification and applicable SDS.

Physical-property requirements: confirm them against the current product-specific specification and applicable SDS.

Safety review: assess handling, storage and process controls against the applicable SDS and current product-specific specification.

It may be evaluated as a reactive phosphine reagent for organophosphorus synthesis when the intended process and handling controls are defined.

Safety review: assess handling, storage and process controls against the applicable SDS and current product-specific specification.

FAQ - Technical & Supply Chain

Q:
Does CAS 998-40-3 always mean pure tri-n-Butylphosphine?

A: Not necessarily. Offers may report tri-n-Butylphosphine separately from total Tributylphosphine isomers, so the active n-isomer and total-isomer assays can differ. State the required isomer basis, assay method and whether an isomer mixture is acceptable.
Q:
Is Tributylphosphine supplied neat or as a solvent solution?

A: Both forms are available. Neat material and solutions in NMP or another stated solvent have different active concentrations, handling and dosing. Specify concentration, solvent, water limit, quantity and process compatibility, and require the quotation to identify the supply form.
Q:
Which specifications should be agreed for Tributylphosphine?

A: Confirm assay, phosphine-oxide limit, water, color, inert-gas filling and the packaging closure system. For process use, also state the maximum acceptable oxygen or oxide content and the analytical method so that the batch analysis and technical data can be compared to the offered grade.
Q:
What are the key physical properties of Tributylphosphine?

A: Tributylphosphine is a clear, air-sensitive liquid with molecular formula C12H27P, molar mass about 202.32 g/mol, density about 0.81 g/mL at 25 C and melting point around -65 C. Its boiling point is commonly reported around 240-242 C at atmospheric pressure or about 150 C at 50 mmHg.
Q:
How should Tributylphosphine be stored and handled?

A: Keep in tightly closed containers under inert gas in a cool, well-ventilated area away from air, oxygen, heat, sparks and oxidizing or halogenated materials. Use dry, inerted transfer equipment, follow the current safety information, and maintain spill and fire controls appropriate for a pyrophoric or air-sensitive phosphine.

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