lec 11 - IUPAC Nomenclature Chem 221 Wednesday, July 27,...

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IUPAC Nomenclature Chem 221 Wednesday, July 27, 2011
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IUPAC Names of Alkenes and Cycloalkenes (2) Number the chain from the end to give lower numbers to the alkene carbons. The location of the double bond is given by the number of the first carbon of the alkene function. 3 2 1 cyclopent ene (1) Select the longest continuous carbon chain that contains the double bond as the parent . Drop the "ane" in the alkane name and add "ene." Similarly, cycloalkanes become cycloalkenes . CH 3 CH 2 CH = CHCH 3 (3) Substituents are indicated by positional numbers . CH 3 C=CHCH 2 CH 3 CH 3 1 2 3 CH 3 CH=CHCH 2 Cl 3 2 1
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(4) Number substituted cycloalkenes so that the alkene carbons are positions 1 and 2 and in the direction that gives the lower positional numbers to substituents. CH 3 1 2 Cl 1 2 3 (5) When an alcohol function is present, the substitutive naming system is used. Alkenol and cycloalkenol names are assigned such that the alcohol always has the lower possible number. CH 3 CH=CHCHCH 3 OH 3 2 1 OH CH 3 1 2 3
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(6) " Cis " and " trans " can be used to designate isomers when there are two identical substituents on the alkene.
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lec 11 - IUPAC Nomenclature Chem 221 Wednesday, July 27,...

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