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    Alkenes Group

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    Hanna Galati
    Alkenes contain carbon-carbon double bonds. They are considered unsaturated compounds and use the suffix -ene. The molecular formula for alkenes is CnH2n. IUPAC nomenclature rules state that the longest carbon chain containing the double bond is used as the parent chain. The double bond is given the lower number as a locator. Cycloalkenes assign the double bond carbons as positions #1 and #2 in the ring.

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    Alkenes Group

    Uploaded by

    Hanna Galati
    21 views8 pages
    Alkenes contain carbon-carbon double bonds. They are considered unsaturated compounds and use the suffix -ene. The molecular formula for alkenes is CnH2n. IUPAC nomenclature rules state that the longest carbon chain containing the double bond is used as the parent chain. The double bond is given the lower number as a locator. Cycloalkenes assign the double bond carbons as positions #1 and #2 in the ring.

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    Alkenes contain carbon-carbon double bonds. They are considered unsaturated compounds and use the suffix -ene. The molecular formula for alkenes is CnH2n. IUPAC nomenclature rules state that the longest carbon chain containing the double bond is used as the parent chain. The double bond is given the lower number as a locator. Cycloalkenes assign the double bond carbons as positions #1 and #2 in the ring.

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    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    21 views8 pages

    Alkenes Group

    Uploaded by

    Hanna Galati
    Alkenes contain carbon-carbon double bonds. They are considered unsaturated compounds and use the suffix -ene. The molecular formula for alkenes is CnH2n. IUPAC nomenclature rules state that the longest carbon chain containing the double bond is used as the parent chain. The double bond is given the lower number as a locator. Cycloalkenes assign the double bond carbons as positions #1 and #2 in the ring.

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    © All Rights Reserved
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    Download as pptx, pdf, or txt
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    Alkenes

    ( Description and Nomenclature)

    Ramos, Dana Remylyn


    Avila, John Mark
    Macasiab, Deinard - Al
    “Organic Compounds”
    -is any of a large class of chemical compounds in which one or more
    atoms of carbon are covalently bonded to atoms of other elements. The
    simplest organic compound is called Hydrocarbons.

    Hydrocarbons
    -is any of a class of organic chemical compounds composed only of the
    elements Carbon ( C ) and Hydrogen ( H ).

    Types of Hydrocarbons
    Name Definition General Formula
    Alkane Hydrocarbon with only single CnH2n+2
    bonds between carbon atoms

    Alkene Hydrocarbon with at least one CnH2n


    double bond

    Alkyne Hydrocarbon with at least one CnH2n-2


    triple bond
    Alkenes
    contain carbon-carbon double bonds.
    also called as olefins.
    are considered as unsaturated compounds.
    use -ene as suffix.

    Molecular Formula
    CnH2n
    Where:
    n is the number of carbons.
    Examples:
    1. n = 1
    2. n = 4
    3. n = 9
    4.n = 5
    5. n = 7

     Note: Always followed the rule in


    Covalent Bonding.
    “Nomeclature of
    Alkenes”
     The IUPAC Nomenclature of Organic Chemistry is
    a systematic method of naming organic chemical
    compound as recommended by the International Union
    of Pure and Applied Chemistry ( IUPAC ).
    Important Things to Remember:
    # of Carbon Prefix Common Substituent Group
    Atoms Group Name

    1 Meth- -CH3 Methyl

    2 Eth- -C2H5 Ethyl

    3 Prop- -C3H7 Propyl

    4 But- -C4H9 Butyl

    5 Pent- -C5H11 Pentyl

    6 Hex-

    7 Hept-

    8 Oct-

    9 Non-

    10 Dec-
    “IUPAC Rules for Alkene and Cycloalkene
    Nomenclature”
     1.   The -ene suffix (ending) indicates an alkene or cycloalkene.
     2.  The longest chain chosen for the root name must include both
    carbon atoms of the double bond. 
     3.  The root chain must be numbered from the end nearest a double
    bond carbon atom. If the double bond is in the center of the chain,
    the nearest substituent rule is used to determine the end where
    numbering starts.
     4.  The smaller of the two numbers designating the carbon atoms of
    the double bond is used as the double bond locator. If more than
    one double bond is present the compound is named as a diene,
    triene or equivalent prefix indicating the number of double bonds,
    and each double bond is assigned a locator number.
     5.  In cycloalkenes the double bond carbons are assigned ring
    locations #1 and #2. Which of the two is #1 may be determined by
    the nearest substituent rule.
     

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