2-Butene-1,4-diol molecular structure diagram (CAS 110-64-5, formula C4H8O2)

ISO tank container packaging for bulk 2-Butene-1,4-diol (CAS 110-64-5) supplied by Nexal Inc.

2-Butene-1,4-diol

CAS NO. 110-64-5

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plasticizer crosslinking agent pharmaceutical intermediate alkene polymerization

Product Description

Applications

Parameter	Specification
CAS Number	110-64-5
EC Number	203-787-0
IUPAC Name	(2Z)-but-2-ene-1,4-diol
Molecular Formula	C₄H₈O₂
Molecular Weight	88.11 g/mol
Appearance	Colorless or pale yellow transparent liquid
2-Butene-1,4-diol Content	≥ 99.0%
cis-Isomer Content	≥ 97.0%
trans-Isomer Content	≤ 2.5%
1,4-Butanediol	≤ 0.6%
1,4-Butynediol	≤ 0.2%
Water Content	≤ 0.3%
Color (APHA)	≤ 100
Solubility	Soluble in water, ethanol, and acetone; sparingly soluble in benzene
Application Categories	Plasticizer for alkyd resin systems; chain extender and polyol crosslinker; building block for specialty organic synthesis
Packaging	200–220 kg drums; IBC totes; ISO tank container (bulk) on request

✓ Specifications reflect Nexal's standard incoming-quality acceptance criteria for industrial-grade 2-Butene-1,4-diol. A current Certificate of Analysis is provided with each shipment.

Industrial Applications of 2-Butene-1,4-diol (CAS 110-64-5)

2-Butene-1,4-diol (CAS 110-64-5), also known as cis-1,4-butenediol or 1,4-dihydroxy-2-butene (Spanish: 2-buteno-1,4-diol), is an unsaturated C₄ diol that combines two primary hydroxyl groups with an internal alkene bond. The combination of these two functional features defines its role across several established categories of industrial chemistry, summarized below.

• Plasticizer for Alkyd Resin Systems

Use of 2-Butene-1,4-diol as a plasticizing co-monomer in alkyd resin chemistry is a class of application that has been established in the coatings and resin industry for several decades. The hydroxyl groups participate in esterification with polybasic acids during resin build, while the internal double bond remains available for downstream cure chemistry.

End-use category: alkyd-based industrial coatings, architectural finishes, resin binder systems.

• Chain Extender and Polyol Crosslinker

The two primary hydroxyl groups place 2-Butene-1,4-diol within a long-recognized family of short-chain diol crosslinkers and chain extenders for hydroxyl-reactive polymer systems. Its incorporation into hydroxyl-functional polymer backbones has been documented in the polymer chemistry literature since the 1960s.

End-use category: hydroxyl-functional thermoset systems, generic polyol chemistry, reactive oligomer synthesis.

• Building Block for Specialty Organic Synthesis

As a difunctional unsaturated diol, 2-Butene-1,4-diol is referenced in academic and industrial organic chemistry as a substrate for allylic transformations, hydroxyl-group functionalization, and Diels-Alder type reactions involving the activated alkene. These are general reactivity classes, not recommendations for any specific commercial product.

End-use category: laboratory and pilot-scale specialty synthesis, custom intermediate development.

Composition Note: Nexal supplies industrial-grade material at ≥99.0% assay with cis-isomer content ≥97.0%, water ≤0.3%, and color (APHA) ≤100 — a controlled composition profile suited to industrial processes that require consistent incoming material.