E-EROS TUTORIAL

New Zealand. General Assembly Library

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• Publié par: Omkou
• Nombre de lectures: 19
• Langue: English

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E-EROS TUTORIAL Encyclopedia of Reagents for Organic Synthesis at the UIUC Chemistry Library   For any questions about e-EROS please contac t Tina Chrzastowski or call [phone].     Introduction  About e-EROS: Encyclopedia of Reagents for Organic Synthesis   e-EROS is the electronic counterpart of the print version of the Encyclopedia. The database contains around 50,000 reactions and 3,800 of the most frequently consulted reagents.   To open e-EROS, go to the Chemistry Library's homepage (http://www.library.uiuc.edu/chx/) and look for the e-EROS link under "E lectronic Reference."     Starting to Use e-EROS When you first open e-EROS from the Chemistry Library's homepage, you will see what information e- EROS has to offer.  

    The database is searchable through browsing the index, keyword searching or through Structure & Metadata searching. The Structure & Metadata search first consists of drawing structures (for the substructure, structure exact or reaction substructure). To narrow the results, the database can then be searched by: reagent name, reaction name, catalyst name, solvent name, product yield, temperature, authors, reference and publication year.   Each entry highlights the various uses and characteristics of each reagent through: illustrations, information on physical data, solubility, the form it is supplied in, purification, and where relevant, preparative methods. Each entry has a list of literatu re references to key review articles and seminal papers.  

For the purpose of this tutorial we will search for information on Iodine.     Basic Searches Searching by browsing the index of reagents   Click on the link "Browse articles by Reagent Name" on the main e-EROS website.

    The reagents are listed by abbreviations, alphabetically and by the date that they became available to the database. To find information on Iodine, open the folder labeled "Dip-K" and then scroll down to the Iodine entry.  

 

  There are a number of Iodine entries, including: Iodine Iodine Azide Iodine Nitrate Iodine-Silver(I) Fluoride Etc.  

 

    By clicking on the link to Iodine Nitrate you will ge t information on: its properties, see examples of its structure through illustrations and have access to different references. Note that the same information can be found in the print version.     Searching by keyword Keyword searching can be used more effectively if you use combined search terms or use Boolean searching. Boolean searching has to do with phrasing words together using AND, OR, or NOT when

searching. In example, typing in "Iodine" AND "2004" suggest that entries that have both the words Iodine AND the number 2004 will come up. If you type in "Iodine" OR "Nitrate", then the entries that either have Iodine OR Nitrat e, or have both Iodine and Nitrate in th e entry, will come up in the search. If you type in "Iodine" NOT "Nitrate", then all articles that contain Iodine but NOT Nitrate will appear.   There are two other ways to enhance your search. Fi rst, to narrow your search, e-EROS does allow for quotation marks. If there is a phrase you wish to search for, using quotation marks will limit your search to only entries that have those words next to each other. Second, using truncations can expand your search. Truncations are symbols such as * or ? and indicate you want any word that stems from the original word. If you type the search term "Iodine*", the database knows that you want information on Iodine or any form of Iodi ne, such as Iodine-copper.     To use a keyword search, start from the e-EROS home page and type into the search box:  

    By only typing in Iodine and then hitting the search button there are 569 hits.   By clicking on the link called "edit results", you ca n narrow the results by usin g Boolean search terms or using the supplied categories.   In this example, Iodine is limited to what is found in: Fulltext/Abstracts, in journals, and had to be published between the dates of Nov. 2004-Dec. 2004.  

 

         

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    Note: You could also go to the Advanced Search link from the e-EROS homepage for this option.       Structure & Metadata Search: Drawing Structures and Reactions How to use the drawing tools   From the homepage of e-EROS, click on the "search in this title" link.  

 

    From here you will see the option of either plugging in keywords for a text only search or to use the Structure and Metadata Search format. Note that to use this searching format, you must search by one of the three following terms for the first box: by Substructure, by St ructure (exact) or by Reaction (Substructure). For this example, we will search for a reaction for when Iodine is added to cyclohexene.    

 

   

 

 

    A second window pops-up in order to draw the structure or reaction. Th ere are a number of tools to use in drawing the structure or reaction.  

 

    The most common element letters are found on the left hand side of the window: C, N, O, S, F, Cl, Br, P, A, and Q. The letter X brings up the Periodic Table to select a different atom. The letter L is the "Select Atomlist" table. In this table you ca n modify the elements by changing the Hydrogen Count, or clicking on "not-list" you can choose elements that you do not want associated with the specific structure being drawn. (in example, different variations of Iodine have th e similar structures. To ma ke sure certain Iodine compounds do not appear, use the "not-list" option.)  

         

     

      

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    The different drawing tools are available to create the structure. (N ote: When creating a reaction (substructure), remember you must include AT LEAST one reactant, one reaction arrow and one product, in the drawing.)  

    Once the structure is completed, click on the transfer button to bring the image into your search.  

 

 

 

 

    Structure & Metadata Search: Combining Search Terms   When the structure is drawn, then you can do a search. In this first example, the reaction of adding Iodine to cyclohexene is found in only one article.  

    To look at the structure or reaction more closely, click on the magnifying glass icon. To see the article that has this structure, click on the link. You will see that this reaction drawing leads us back to the original Iodine article.