CAS Reactions

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

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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™

新兴科学

Fossil fuels to biofuels: How biomass can drive sustainability

Biomass is currently just a fraction of our energy sources, but with more sustainable feedstocks and conversion processes, biomass-based chemicals and fuels could become common replacements for fossil fuel-based materials.
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药物开发

AI in drug discovery: Moving from potential to practical

CAS hosted Life Sciences Summits across three regions in 2025, exploring practical AI integration in drug discovery. Learn about data governance, implementation barriers, and modality-specific challenges.
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新兴科学

Nipah virus explained: Risks, realities, and the hope from new research

New Nipah cases in India have renewed focus on a high‑fatality zoonotic threat shaped by complex spillover dynamics, severe neurological disease, and limited medical countermeasures. Meanwhile, global efforts in diagonistcs, therapeutics, and vaccines are accelerating.
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