The Basis Set Exchange provides downloadable basis sets for quantum chemistry in formats including NWChem and Gaussian.
Organic Synthesis Search
Organic Synthesis Search lets users browse chemical transformations by the desired bond formation.
About Organic Synthesis Search
Organic Synthesis Search is a section of the Organic Chemistry Portal that lets users browse synthetic transformations by the bond formation they aim to achieve. The homepage presents a graphical index with several options and links, intended to help users develop new synthetic ideas. If a reaction is not found in the index, the page suggests searching the site directly.
The page also includes explanatory text comparing target-oriented synthesis with diversity-oriented synthesis, and describing retrosynthesis, which breaks a target molecule into simpler building blocks. The homepage text does not describe downloadable data, pricing, or accounts.
Key features
- Browse synthetic transformations by the desired bond formation
- Graphical index with multiple options and links to follow
- Index options by element symbol, including B, C, N, O, Si, P, S, F, Cl, Br, I and Sn
- Index options for carbocycles and heterocycles
- Direct site search for reactions not found in the index
- Explanatory text on retrosynthesis and target-oriented versus diversity-oriented synthesis
Best for: Organic chemists who want to find reactions by the bond they need to form.
Good for
- The index is organized by the bond formed, which suits route planning by bond type.
- The page includes background explanations of synthesis strategy alongside the index.
Watch out for
- The homepage suggests a direct site search when the desired reaction is not found in the index, so the index may not cover every reaction.
- The homepage text does not describe downloadable datasets, so its fit with the directory's open data category is unclear.
Organic Synthesis Search at a glance
- Category
- Research & Data › Open Data & Datasets
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Organic Synthesis Search FAQ
What does the index organize reactions by?
The index browses synthetic transformations by the desired bond formation.
What should I do if I cannot find a reaction in the index?
The homepage suggests searching the site directly for the desired reaction.
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