Ch_322a_4.08

Ch_322a_4.08 - substitutive naming system is used. Alkenol...

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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 2 -pent ene 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 2 -methyl- 2 -pentene CH 3 CH=CHCH 2 Cl 3 2 1 1 -chloro- 2 -butene
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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 1-methyl cyclohexene Cl 1 2 3 3-chloro cyclopentene (5) When an alcohol function is present, the
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Unformatted text preview: 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 3-penten-2-ol (not 2-penten-4-ol ) 3-methyl-2-cyclohexen-1-ol OH CH 3 1 2 3 (6) " Cis " and " trans " can be used to designate isomers when there are two identical substituents on the alkene. C=C Cl Cl H H C=C H H Cl Cl cis-1,2-dichloroethene trans-1,2-dichloroethene Two important common names involving alkenes are CH 2 =CH-CH 2 =CH-CH 2-vinyl group allyl group CH 2 =CH-Cl CH 2 =CH-CH 2-Cl "vinyl chloride" "allyl chloride" (chloroethene) (3-chloropropene) Quiz 4.06 Name the compound below. OH CH 3 H 3 C 2,2-dimethylcyclopent-3-en-ol 2,2-dimethyl-3-cyclopenten-1-ol or...
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Ch_322a_4.08 - substitutive naming system is used. Alkenol...

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