Does CAS 4756-05-2 identify Thioacetone monomer or its cyclic trimer?

CAS 4756-05-2 identifies monomeric Thioacetone, or propane-2-thione, not the cyclic trimer trithioacetone. The monomer, trimer and polymerized material are not interchangeable. Before qualification, confirm the actual molecular form, concentration or matrix, physical state and an agreed chromatographic or spectral identity method.

Can neat Thioacetone be specified as a routine ambient-temperature liquid shipment?

No. Monomeric Thioacetone is highly unstable and readily forms polymeric and cyclic-trimer material, especially above about −20 °C. A quotation must identify what form is actually offered and define temperature, concentration or matrix, stabilization if any, assay basis, impurity profile, container and transport conditions; the CAS number alone is not a shipment specification.

Thioacetone CAS 4756-05-2

Thioacetone, also called propan-2-thione or dimethyl thioketone, CAS 4756-05-2, is a thioketone with molecular formula C₃H₆S and molecular weight 74.14 g/mol. It must not be confused with thioacetic acid or reagents derived from thioacetic acid. Monomeric thioacetone is volatile, strongly odorous and prone to association or oligomerization, so confirm the offered physical form, composition, analytical basis and handling controls for each project. Supply is intended for controlled small-scale research or synthesis rather than unsupported commodity applications.

CAS: 4756-05-2
Synonyms: Thioacetone, 2-Propanethione, Propan-2-thione, Dimethyl thioketone
Molecular Formula: C₃H₆S
Grade: Confirm whether the offer is monomeric material, a solution or a characterized associated or oligomeric form, together with the identity method, assay basis, composition, stabilizing conditions and handling controls against the current COA and SDS.
Package: State required form, quantity and destination; confirm the qualified sealed container, secondary containment, odor and vapor controls, net fill, atmosphere or temperature conditions and transport requirements against current documentation.

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Product Description

1 Identity and physicochemical profile

2 Applications and grade selection

3 Storage and handling

4 Safety, documentation and procurement

Identity and physicochemical profile

Item	Technical guidance
Correct identity	Thioacetone; propan-2-thione; dimethyl thioketone
CAS number	4756-05-2
Formula / molecular weight	C₃H₆S / 74.14 g/mol
Chemical character	Low-molecular-weight thioketone with condition-dependent monomer, associated and oligomeric forms
Key purchase controls	Delivered form, identity method, assay basis, oligomer profile, stabilizing conditions and package integrity
Identity boundary	Thioacetone is not thioacetic acid and should not be assigned reactions or uses belonging to thioacetate reagents

Applications and grade selection

Thioacetone may be evaluated in specialized sulfur chemistry, trapping studies and controlled synthesis where a thioketone or its defined associated form is required. Because composition and behavior can depend on preparation, concentration, temperature and storage, buyers should qualify the actual delivered material rather than relying on generic monomer properties.

Define whether the project requires monomeric material, a solution or a characterized associated or oligomeric form.
Agree the identity technique, assay calculation and limits for oligomers or route-specific impurities before ordering.
Plan closed sampling, odor containment, compatible packaging and small-scale reaction qualification with the current SDS.

Storage and handling

Keep the material sealed in the qualified container under the temperature and atmosphere stated in the supplier documentation. Use local exhaust and closed transfer where practicable, and do not open or warm the container without a project-specific handling plan.

Safety, documentation and procurement

Thioacetone requires strict odor, vapor and ignition-source controls. Handle only by trained personnel using suitable containment and personal protection under the current SDS and site assessment. Procurement should define form, assay basis, quantity, destination and shipping constraints.

FAQ - Technical & Supply Chain

Q:
Does CAS 4756-05-2 identify Thioacetone monomer or its cyclic trimer?

A: CAS 4756-05-2 identifies monomeric Thioacetone, or propane-2-thione, not the cyclic trimer trithioacetone. The monomer, trimer and polymerized material are not interchangeable. Before qualification, confirm the actual molecular form, concentration or matrix, physical state and an agreed chromatographic or spectral identity method.
Q:
Can neat Thioacetone be specified as a routine ambient-temperature liquid shipment?

A: No. Monomeric Thioacetone is highly unstable and readily forms polymeric and cyclic-trimer material, especially above about −20 °C. A quotation must identify what form is actually offered and define temperature, concentration or matrix, stabilization if any, assay basis, impurity profile, container and transport conditions; the CAS number alone is not a shipment specification.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

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Quotation

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Sample & Supply

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Storage & Shipping

Product-specific conditions are confirmed before order.

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