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SCAN0023 - degree mark 2 0 Terr(tertiary implies attachment...

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Unformatted text preview: degree mark, 2 0. Terr (tertiary) implies attachment to a carbon that has three other carbons attached to it, denoted 3 0. Look at Figure 4 and become familiar with the common names and reference them to the I.U.P.A.C. names that are also provided. Cil3\ CH3\ /CH3 H3C\ H3C\ $1.13 CH—CHz-CHz-Cflz-CHs CHCHz pH—OH CH-OH _ _ CH3/ CH3/ ch CH3CH2/ CH3 ('3 OH CH3 W >4 w kw +0.. CH3CH(CH3)CH2(CH2)2CH3 (CH3)2CH(CH2)3CH3 (CH3)2CHCH2CH3 (CH3)2CHOH CH3CH(OH)CH2CH3 (CH3)3COH isohcptane isopcntanc isopropanol secbutanol tertbutanol 2—methy1hexane Z—methylbutane 2-propanol 2-butanol 2-methy1—2-propanol Figure 4 I.U.P.A.C. Rules 1. The longest carbon chain is the parent. Once the carbons in the longest chain have been attributed to the parent there is no need to name them again. Circle them so that you will be sure not to use these carbons in naming one of the branches. 2. If there is a tie between two chains for the longest, the parent should be chosen as the one with the most branches. 3. Any branch off the parent is named as a substituent. The — ane ending is dropped from the name of a single bonded carbon chain of this length and replaced with e yl to indicate a substituent (e.g. propane becomes propyl for a branch chain). 4. The parent needs to be numbered so that the branch will be at the smallest possible number ( 2—methylbutane and NOT 3-methylbutane ). 5. Numbers are separated from words with a dash ‘ — ‘ and numbers are separated from one another by commas. Substituents are written in alphabetical order. 6. When more than one of the same substituent is present, this is indicated by prefacing the substituent with di— tri- tetra— penta- etc. (this does not change its alphabetical position). The locations on the parent are indicated by a number for every substituent. (2,2-dimethylpropane or 2,2,3,S-tetramethyheptane). 7. When multiple substituents are present, number the chain in the direction such that the position number of the first substituent is the smaller number. If the first substituents from either end have the same number, then number so that the second substituent has the smaller number, etc. (2,2,3—trimethylbutane, NOT 2,3,3— trimethylbutane). ...
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