CHEM 212 Lecture 4

CHEM 212 Lecture 4 - 9/10/2009 ORGANIC CHEMISTRY 212 Youla...

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9/10/2009 1 ORGANIC CHEMISTRY 212 Youla S. TSANTRIZOS Office: Chemistry Department Email: [email protected] ORGANIC CHEMISTRY 212 Chapter 4: - Nomenclature - Conformations of Alkanes - Conformation of Cycloalkanes
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9/10/2009 2 Nomenclature – IUPAC System I nternational U nion of P ure and A pplied C hemistry • an Alkyl Group = an Alkane missing 1H atom e.g. CH 4 ( Alkane ) – 1H = -CH 3 ( Alkyl group ) • the parent name is determined by the longest continuous chain of carbon atoms • numbering of the carbon chain should begin from the terminal closest to the substituent • when two or more substituents are present, each one has a number and is placed in the name alphabetically What is the name of this compound ? H 3 C CH CH 2 CH CH 2 CH 2 CH 3 CH 3 HC CH 3 OH 1 2 3 4 5 6 5-methyl-3- n -propyl- 2 -hexanol 5-methyl-3- n -propylhexan-2-ol Both names are correct, 2-hexanol is more commonly used For chains of equal length, greatest number of substitution is preferred
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9/10/2009 3 What is the name of this compound ? H 3 C CH CH 2 CH CH 2 CH 2 CH 3 CH 3 HC CH 3 OH 5-methyl-3- n -propyl- 2 -hexanol 1 2 3 4 5 6 5-methyl-3- n -propylhexan-2-ol Isobutyl or i -Butyl 3-isobutyl-2-hexanol 3-isobutylhexan-2-ol Diols – Alcohols with two Hydroxy Groups 1 2 3 4 1,3-Butanediol
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9/10/2009 4 What is the name of this compound ? 1 2 3 4 5 6 4-isopropyl Octane 4- i sopropyl-2,2,3,6-tetra m ethyloctane 7 8 2,2,3,6-tetramethyl 2,2,3,6-tetra m ethyl-4-iso p ropyloctane Nomenclature – IUPAC System I nternational U nion of P ure and A pplied C hemistry • when two or more substituents are present, each one has a number and is placed in the name alphabetically • when substituents are alphabetized: - iso - is used as part of the name; e.g . isopropyl - hyphenated prefixes, e.g.
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This note was uploaded on 10/16/2009 for the course CHEM CHEM212 taught by Professor T during the Fall '09 term at McGill.

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CHEM 212 Lecture 4 - 9/10/2009 ORGANIC CHEMISTRY 212 Youla...

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