Chapter 09 Powerpoint

Chapter 09 Powerpoint - Introduction to General and Organic...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 9 Alkynes Dr. David P. Brown Department of Chemistry Introduction to General and Organic Chemistry III
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 9 2 Introduction Alkynes contain the triple bond . General formula is C n H 2n-2 Also known as Acetylenes Two elements of unsaturation for each triple bond. Some reactions are like alkenes: addition and oxidation. Some reactions are specific to alkynes.
Background image of page 2
Chapter 9 3 Nomenclature: IUPAC Find the longest chain containing the triple bond . Change -ane ending to -yne . Number the chain, starting at the end closest to the triple bond . Give branches or other substituents a number to locate their position. =>
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 9 4 Examples: CH 3 CH CH 3 CH 2 C C CH CH 3 CH 3 CH 3 C C CH 2 CH 2 Br CH 3 C CH Propyne 5-Bromo-2-pentyne 2,6-Dimethyl-3-heptyne
Background image of page 4
Chapter 9 5 Additional Functional Groups All other functional groups, except ethers and halides have a higher priority than alkynes . For a complete list of naming priorities, look inside the back cover of your text. =>
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 9 6 Examples: 4-methyl-2-hexyne CH 3 C C CH 2 CH OH CH 3 4-Hexyn-2-ol H 3 C C C CH CH 3 OEt 4-Ethoxy-2-pentyne
Background image of page 6
Chapter 9 7 Common Names Named as substituted acetylene . CH 3 C CH Methylacetylene CH 3 CH CH 3 CH 2 C C CH CH 3 CH 3 Isobutylisopropylacetylene =>
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 9 8 Physical Properties Nonpolar , insoluble in water. Soluble in most organic solvents. Boiling points similar to alkane of same size. Less dense than water . Up to 4 carbons, gas at room temperature . =>
Background image of page 8
Chapter 9 9 Electronic Structure The sigma bond is sp-sp overlap . The two pi bonds are unhybridized p overlaps at 90 ° , which blend into a cylindrical shape . =>
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 9 10 Bond Lengths More s character, so shorter length . Three bonding overlaps, so shorter. Bond angle is 180 ° , so linear geometry . =>
Background image of page 10
Chapter 9 11 Question Which of the following is True regarding the compound Ethyne ? A. The carbon atoms are sp 2 hybridized, giving the molecule a planar triangular shape. B . The carbon atoms are sp 3 hybridized, giving the molecule a tetrahedral shape. C . The carbon atoms are sp hybridized, giving the molecule a linear shape. D . The carbon atoms are sp 3 d 2 hybridized, giving the molecule an angular shape.
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 9 12 Acidity of Alkynes Terminal alkynes, R-C C-H , are more acidic than other hydrocarbons. Acetylene
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 55

Chapter 09 Powerpoint - Introduction to General and Organic...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online