CHEM301 F10 CA4

CHEM301 F10 CA4 - CHEM 301, Fall 2010 Dr. Ruder Class...

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CHEM 301, Fall 2010 Dr. Ruder Class Activity 4 Nomenclature of Alkanes How do we name organic compounds? Model 1: Straight Chain Alkanes # Carbons Prefix Name Structure 1 Meth Methane CH 4 2 Eth Ethane CH 3 CH 3 3 Prop Propane CH 3 CH 2 CH 3 4 But Butane CH 3 CH 2 CH 2 CH 3 5 Pent Pentane CH 3 CH 2 CH 2 CH 2 CH 3 6 Hex Hexane CH 3 CH 2 CH 2 CH 2 CH 2 CH 3 7 Hept Heptane CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 8 Oct Octane CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 9 Non Nonane CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 10 Dec Decane CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 Questions: 1. Based on the information in Table 1, how is the prefix modified to name a straight chain alkane? 2. The prefix dodec means twelve carbons. Give the name of the corresponding alkane and draw the structure. Model 2: Branched Alkanes- Note that a dash separates a number and a letter in a name. Structure Parent Chain #C in parent Substituent #C in substituent Name A propane 3 methyl 1 2-methylpropane B 2-methylbutane C pentane 5 ethyl 2 D 3-methylhexane Questions: 3 . For compound A in Model 2. (a). How many carbons are in the parent chain? Circle the parent chain. (b). How many carbons are in the substituent? Put a box around the substituent. (c). Number the carbons in the parent chain consecutively. (d). Why is there a number 2 in front of the methyl in the name? 4. Complete the table for B, C and D.
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CHEM 301, Fall 2010 Dr. Ruder 5. (a). For compound B in Model 2, number the carbons in the parent chain consecutively. (b). Does your numbering scheme agree with the name given? (c). If not, renumber the chain so the numbering agrees with the name. (d). The name for compound B is 2-methylbutane, not 3-methylbutane. What conclusion can you make for numbering substituents? 6 . (a). For compound D, circle the parent chain. Does the parent have six carbons? (b). If not circle a chain with six continuous carbons. (c).
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This note was uploaded on 04/30/2011 for the course CHEM 301 taught by Professor Sahli during the Spring '07 term at VCU.

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CHEM301 F10 CA4 - CHEM 301, Fall 2010 Dr. Ruder Class...

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