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Mastering Organic Compound Naming Guidelines

Learn to name organic molecules following the guidelines including Lewis structures, VSEPR, and condensed formulas. Understand the rules for stick figures representation and branch identification. Practice naming using prefixes and alphabetizing side chains.

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Mastering Organic Compound Naming Guidelines

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  1. Writing Organic Molecules CHM1032C

  2. Lewis Structure

  3. VSEPR

  4. Condensed Formula

  5. Stick Figures

  6. Stick Figures (Rules) • Hydrogens attached to carbons are not shown. (Hydrogens attached to hetero-atoms are shown) • Each vertex and terminus is a carbon. • All hetero-atoms are shown explicitly.

  7. Example

  8. Example 2

  9. Naming organic compoundsAlkanes • Find the longest continuous chain of carbons. This becomes the root. Name the root by adding “-ane” to the appropriate prefix. A 4 carbon chain would be butane. • Identify any branches. Name each branch by the number of carbons. A 1 carbon branch is methyl.

  10. Naming continued • Put side chains in alphabetical order. The side chains come before the root. Use di, tri, tetra (etc) if you have more than one of something, these do not count in alphabetizing. • Number root from side closest to the first branch. • Use numbers to tell where the side chains sprout from the root. Put a dash between any number and letter or any letter and number. Use a comma between two numbers.

  11. Example Table 11.2 Prefixes used to show the presence of one to ten carbons in an unbranched chain.

  12. Naming #3 • Use the prefix “cyclo” for ring systems. • Be aware that some complicated branches have common names and some of those are on table 11.3.

  13. More examples

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