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™

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

Read article

Biotechnology

Sports science trends: The latest technology transforming football and more

Aerogels in shin guards, self-powered sensors in jerseys, leucine-tuned recovery protocols, and smarter artificial turf. The science behind today's most-watched sports is moving faster than the players.

June 4, 2026|Article

Read article

Emerging Science

Ebola: How it continues to challenge modern outbreak science

As a new Ebola outbreak emerges, research into this devastating disease continues to accelerate. Discover how scientists are developing vaccines and therapeutics while confronting the challenge of sustaining innovation between crises.

June 2, 2026|Article

Read article

View all CAS Insights