CAS Reactions

The CAS reactions collection provides detailed and dependable data on more than 150 million single and multi-step reactions.

Features

More than 150 million single- and multi-step reactions published in journals, patents, dissertations, and other sources since 1840.

Covers organic and organometallic reactions. Total syntheses of natural products, and biotransformation reactions.

Scientist-curated and enhanced with yield data, detailed reaction conditions, defined substance roles, and experimental procedures.

Daily updates keep you current on the most recent discoveries.

Connections to relevant publications, substance properties, suppliers, and more within the CAS Content Collection™.

Searchable by structure, reaction role, functional group, reaction site, atom mapping, and more.

Latest from CAS Insights™

Emerging Science

Capacitors, catalysts and coatings: MXenes drive industrial innovations

2D materials like graphene and carbon nanotubes are revolutionizing materials science, and now MXenes are introducing even greater adaptability and high-performance properties. Find out why MXenes are versatile industrial materials.

June 23, 2026|Article

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Biotechnology

Compost smarter: New research cuts emissions, boosts yields

Learn how composting has evolved into a precision-engineered bioprocess, and about how aeration, microbial control, materials science, and AI are reshaping the field.

June 17, 2026|Article

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Drug Discovery

CAS Insights Report: Unlocking the future of pharmaceutical innovation through patent intelligence.

Five years of global pharmaceutical patent data reveal a field in fundamental transition: therapeutic platforms multiplying, molecular targets expanding well beyond traditional proteins, and disease focus shifting toward previously intractable conditions. The patterns show not just where innovation

June 10, 2026|Insights Report

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