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picture1_Heterocyclic Compounds Slideshare 82060 | Nomenclature Of Heterocyclic Compounds


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File: Heterocyclic Compounds Slideshare 82060 | Nomenclature Of Heterocyclic Compounds
what are heterocyclic compounds these are considered to be derived from the carbocyclic compounds by the replacement of one or more carbon atoms by the heteroatom s such as n ...

icon picture PPT Filetype Power Point PPT | Posted on 09 Sep 2022 | 3 years ago
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       What are heterocyclic compounds?
      • These are considered to be derived from the 
        carbocyclic compounds by the replacement 
        of one or more carbon atoms by the 
        heteroatom(s) such as N, O, S etc.
                              
                              Introduction
        •  In earlier days of organic chemistry, names were given to 
           compounds as a means of identifying them, usually before 
           their structure were known.
        •  A systematic nomenclature is necessary so that the 
           structure of the compound can be deduced from its name.
        •  Several different systems of nomenclature have been 
           devised for heterocyclic compounds.
        •  The most systematic nomenclature so far devised is 
           “Replacement Nomenclature”
        •  But, normally, particularly for aromatic heterocycles, a 
           hybrid of trivial and Hantzch-Widman systems is used.
                                            
              Trivial names of Common ring 
                                    systems
        •  These were given before their structural identification. 
        •  Trivial names of the heterocycles were given on the basis 
           of their characteristic properties (or) on the sources from 
           which they are obtained. Eg: Picoline, Furfurol, Pyrrole.
        •  Therefore the trivial names hardly provide any structural 
           information.
        •  There are about 49 ‘recognized’ trivial names.
        •  Eg: Pyrole, Pyrazole, Pyran, Purine, Pyrimidine, 
           Quinoline, Isoquinoline, Xanthene, Perimidine.
                                            
                           
                Why trivial names?
      • The surviving trivial names are important 
        because they are used as basis for 
        constructing- 
         more systematic,
         names for derivatives (or)
         for polycyclic systems.
                               
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...What are heterocyclic compounds these considered to be derived from the carbocyclic by replacement of one or more carbon atoms heteroatom s such as n o etc introduction in earlier days organic chemistry names were given a means identifying them usually before their structure known systematic nomenclature is necessary so that compound can deduced its name several different systems have been devised for most far but normally particularly aromatic heterocycles hybrid trivial and hantzch widman used common ring structural identification on basis characteristic properties sources which they obtained eg picoline furfurol pyrrole therefore hardly provide any information there about recognized pyrole pyrazole pyran purine pyrimidine quinoline isoquinoline xanthene perimidine why surviving important because constructing derivatives polycyclic...

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