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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

δ-Valerolactone | CAS 542-28-9

A six-membered lactone monomer for ring-opening polyester synthesis, where water, acidity and pre-existing oligomer content are important when defining the effective monomer charge.

CAS542-28-9
Molecular formulaC5H8O2
Molecular weight100.12 g/mol

Product overview

The ester group is incorporated into a six-membered ring. Opening that ring produces the backbone of poly(δ-valerolactone). This identity differs from five-membered γ-valerolactone, despite the shared formula. For polymer development, monomer assay should be considered alongside nonvolatile oligomeric material and species that affect chain initiation or termination.

Chemical identity

Chemical name
δ-Valerolactone
CAS number
542-28-9
Molecular formula
C5H8O2
Molecular weight
100.12 g/mol

Application context

δ-Valerolactone is used to prepare poly(δ-valerolactone) through ring-opening polymerization and to investigate polyester synthesis. The grade selected for a polymerization study should specify intact monomer content, water and acidity rather than relying on a generic chemical-purity statement. Existing oligomers or polymer can alter the starting composition. The resulting polymer molecular-weight distribution and residual monomer are assessed after the intended process.

Chemistry and synthetic role

Ring opening converts the cyclic ester into an aliphatic polyester repeat unit; it is not the same ring system as γ-valerolactone.

Quality review

Confirm the delta isomer

Use identification that distinguishes six-membered δ-VL from γ-VL.

Measure oligomeric material

Agree a method for nonvolatile or higher-molecular-weight components alongside monomer assay.

Control chain-active impurities

Specify water and acidity in relation to the initiator and catalyst system.

Preparing a specification

Specify δ-VL identity, intact monomer assay, oligomer/polymer assessment, water and acidity aligned with the ring-opening system.

Packaging and storage

Confirm container compatibility, closure and net weight for the selected grade and destination. Follow the actual supplier SDS and batch label for storage and transport.

Documentation

Request the batch COA, SDS and analytical methods covering the agreed purchasing specification. Confirm which supporting chromatograms and application-specific records are available from the selected manufacturer.

Procurement questions

Is it γ-valerolactone?

No. δ-Valerolactone has a six-membered ester ring.

Can monomer GC describe all impurities?

Higher-molecular-weight material may require a separate residue or size-based method.

What should polymer trials compare?

Use the same monomer, water and acid basis, then measure the resulting polymer distribution.

Technical sources
  1. PubChem CAS identity lookupNCBI / PubChem
  2. delta-Valerolactone 389579Sigma-Aldrich
  3. delta-Valerolactone V0039TCI