A new, redesigned Reaxys interface is now available for testing. Please see the Support Center for documentation, FAQs and access to training webinars. The FAQ here are based on the old interface and will be updated in the coming months.
Consider attending other free Reaxys Webinars to expand your search skills. Live webinars are archived for later viewing.
The new date for the retirement of the old Reaxys interface is November 30, 2017.
Beginning in 2016, Reaxys expanded machine-excerption of chemical data from the full text of up to 15,000 journals that are covered by various Elsevier indexing products (Scopus, Embase, Compendex, etc.). This coverage will be extended retroactively back to the earliest fully-digital articles available, according to the company.
Chemical compounds with defined structures and/or molecular formulas are covered. In general, polymers, biological molecules (peptides, proteins, nucleic acids, enzymes, etc.), engineered materials (ceramics, alloys, etc.), and multicomponent mixtures are not included in the core substance-based segment of Reaxys.
Generally not. Some data derived from the print Handbooks were originally assessed for consistency, but more recent data excerpted directly from the literature are not. And since there's no way to tell the difference, you have to assume it's not. (Data taken from patents should be viewed with particular skepticism.) All excerpted data are experimental, however - not derived or calculated.
Reaxys contains plentiful spectral data (peaks, solvents, etc.) on chemical compounds as reported in the primary literature, but no spectral graphs. You can use the form-based search (Query Builder in New Reaxys) to specify spectroscopic data with various parameters. More information
This feature is analogous to SciFinder's topic search box. It parses your terms and attempts to find the most relevant hits. It works fine for some very straightforward searches, such as "preparation of 12078-17-0" where the algorithm can make a relational match between a concept and an unambiguous substance identifier. But it is still being developed and doesn't always get it right. When you use it for non-chemical concept searches it'll drop you into the Literature search, or into external substance files like PubChem. The search forms are still a more reliable entry point into the core database of substances and reactions.
Yes, but don't give up if it doesn't get a hit. Beilstein substance records created prior to 1994 ususally contain RNs as chemical identifiers. Some substance records added since 1994 do not. Many older Gmelin inorganic substance records do not contain CAS RNs. CAS RNs should not be confused with Reaxys registry numbers, which are accession numbers within this database alone. A single substance record in Reaxys may contain several CAS RNs because the two systems use different registration rules. CAS assigns RNs to structures more narrowly than Reaxys.
Yes, but this is the least reliable kind of search. Reaxys indexes various synonyms for compounds, but don't rely solely on name string searching. Some names are shown only in German. CAS Registry Numbers and exact structures are better starting points. You can also generate a structure from a name, which you can then edit for further searching.
Use the Formula Builder tool to create a query with proper syntax. This is especially useful for inorganic and organometallic/coordination compound searching, and for building queries with variable element counts, shortcuts (Me, Et, Ph), and periodic groups. A similar Alloy tool lets you create MF searches specifying component percentages. (The Alloy tool is not present in the new interface.)
No, you have to look up the actual compound. Some handbooks, such as the Aldrich Catalog, still list Beilstein volume/page references (e.g. "Beil. 13, III, 2311"), but Reaxys does not include these at all. Some inorganic substance data tables do provide the corresponding Gmelin Handbook reference alongside the source journal reference, but the Gmelin reference itself is not searchable.
Select the "Names and Formulas" tab. (In New Reaxys, select Query Builder and click the CAS RN button.)
Enter the CAS Registry Number in the CAS RN box. (If the RN is in the Reaxys index you'll see it in the pull-down list as you type.) Click OK, then click Search on the next form. (If you don't have the CAS RN, or if you get no hits, do a search by structure, molecular formula, or chemical name.)
In the entry for the matching compound, click "Show Details" or the appropriate link under "Available Data".
Open the desired data category to view the data table.
Yes, but it can get complicated. Under the Names and Formulas tab, click on the Properties button and select property fields and enter values, which will then appear in search syntax form in the query box. Due to the huge number of property values in the database, this technique is most useful in conjunction with a substructure search, and if you enter a range of values for a property it's best to keep that range narrow to avoid large results sets. You can also use the "exists" operator to limit to substances that contain a particular field without having to enter values for that field. Remember also that a substance record might contain many values for a given property in a table, based on different conditions, and from different sources. To ensure that queried subfields are found in the same row of a data table, use the Proximity operator in the Advanced tab instead of the And operator. Example syntax: BP.BP='69-72' PROXIMITY BP.P='760'
This tab allows you to search across a bibliographic database that includes the source articles and patents for Reaxys chemical information (structures, reactions, properties), as well as about 16,000 other periodical sources that were added from various Elsevier bibliographic files (Scopus, Embase, Compendex, etc.) more recently. These additional sources are not necessarily chemical in nature, and previously were not analyzed for chemical data and content in the way that the "core" journals were.
The "basic index" field searches for words found in titles, abstracts, and indexing terms. You can also use the form to search for author names, patent assignees, journal titles, and numeric fields like year, volume and page numbers.
Despite recent claims, Reaxys is not a comprehensive literature index in the way that SciFinder is: if you need to do a general topical/keyword literature search on chemical topics, it's better to use SciFinder.
Reaxys is valuable for obtaining preparation/reaction methods and physico-chemical data for pure compounds, and especially for its thorough coverage of pre-1960 organic literature. Since its modern journal coverage is more selective than SciFinder's, search results are usually more manageable.
SciFinder excels with its wider and deeper coverage of literature and patents from ca. 1965 forward, its comprehensive registration of all types of chemical compounds, polymers, and mixtures, and its more thorough coverage of organic reactions after 1985. Results can be voluminous because of the sheer number of references, so it's important to do focused searches and use the refining and analysis tools.
The printed Beilstein Handbook entries, while in highly abbreviated German, provided some textual descriptions of synthetic chemistry that are not reflected in the online version. Beilstein Supplement V (Heterocyclics, 1960-79) has only been partially converted. Conversely, there is much information later added to the Beilstein database that was never included in the printed Handbook. Consulting the print is rarely necessary.
Numeric property data from the print Gmelin Handbook up to 1975 can be found in Reaxys. However, Handbook data from 1976 to 1998 (when it ceased) have not been added. Print Gmelin remains useful because it was more textual and narrative in presentation and provided useful tables and graphs that are not included in Reaxys. It is a good idea to follow up a database search with a look in the corresponding Gmelin volumes.
Because the print and online formats are complementary, the printed Handbooks remain available in the Chemistry Library.
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