CAS Reactions

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

Contact us
Hexagon shaped overlay
3D rendering of interconnected blue molecules representing a chemical structure.

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

Wide bandgap semiconductors: Transforming EVs, UV, and wireless communications

For high-performance technologies in power electronics, energy storage, and optoelectronics, semiconductors need to offer performance beyond standard silicon. Wide bandgap semiconductors can handle the high‑voltage, high‑temperature, and high‑frequency conditions of these emerging applications.
|Article
Biotechnology

Hantavirus: How climate change may be increasing disease risk

Hantavirus, a rodent-borne RNA virus with case fatality rates up to 40%, is reshaping zoonotic disease risk amid environmental change and global mobility.
|Article
Materials

Quantum computing: Methods and materials driving new capabilities

Quantum computing includes many methods and types of qubits, and certain materials are key for developing these computing capabilities.
|Article