Chapter07notes

Chapter07notes - 1. Alkene and Alkyne Structure and...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Alkenes are also called ___________ . _________________ have the double bond at the end of the 1. Alkene and Alkyne Structure and Physical Properties carbon chain. _________________ have at least one carbon atom bonded to each end of the double bond. 1 2
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Alkenes and alkynes: exhibit only weak ______________________ have melting points and boiling points. 1. Physical Properties of Alkenes and Alkynes ______ are soluble in organic solvents and insoluble in water. The C-C single bond between an alkyl group and one of the double bond carbons of an alkene is slightly polar because the sp 3 hybridized alkyl carbon donates electron density to the sp 2 hybridized alkenyl carbon. _________________________________ 3 1. Important Structural Aspects of Alkenes: 4
Background image of page 2
3 2. Naming Alkenes and Alkynes Compounds that contain both a double bond and a hydroxy group are named as alkenols and the chain (or ring) is numbered to give 5 are named as and the chain (or ring) is numbered to give the OH group the lower number. Alkynes are named in the same general way that alkenes are named. In the IUPAC system, change the –ane ending of the parent alkane name to the suffix –yne . 2. Naming Polyenes and Cyclic Alkenes Compounds with two double bonds are named as ________ Compounds with three double bonds are named as ________ In naming cycloalkenes, the double bond is located between C1 and C2, and the “1” is usually omitted in the name. The ring is numbered clockwise or counterclockwise to give the first substituent the lower number. 6
Background image of page 3

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

View Full DocumentRight Arrow Icon
4 Compounds with two triple bonds are named as _______ , those with three are named as ______ and so 2. Naming Alkynes forth. Compounds with both a double and triple bond are named as enynes. 7 The simplest alkene, CH 2 =CH 2 , named in the IUPAC system as ethene, is often called ethylene . 2. Common Names of Alkenes and Alkynes Th i l t lk H C C H d i th IUPAC t 8 The simplest alkyne, H C C H, named in the IUPAC system as ethyne , is more often called acetylene, its common name. The two-carbon alkyl group derived from acetylene is called an ethynyl group .
Background image of page 4
5 H vs H 2. Naming Alkenes – E and Z System H H 9 Cl Br CH 3 H e.g. cis or trans? 2. Naming Alkenes – E and Z 10
Background image of page 5

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

View Full DocumentRight Arrow Icon
6 Cl Br CH 3 H C Br 11 Cl CH 3 H Br 4 1 (3) 8 7 6 5 2 C3 B > C 12 C3: Br C4: t Bu > n Bu
Background image of page 6
7 Alkenes are classified according to the number of carbon atoms bonded to the carbons of the double bond. 2. Alkene Classification 13 2. Alkene Stability Trans alkenes are more stable than cis alkenes Stability increases with substitution (1) 14 (2)
Background image of page 7

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

View Full DocumentRight Arrow Icon
8 Removal of the elements HX is called dehydrohalogenation. Dehydrohalogenation is an example of β elimination. 3. Elimination Reactions The curved arrow formalism shown below illustrates how four bonds are broken or formed in the process.
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/09/2011 for the course CHEM 2341 taught by Professor Staff during the Fall '11 term at Texas State.

Page1 / 30

Chapter07notes - 1. Alkene and Alkyne Structure and...

This preview shows document pages 1 - 9. Sign up to view the full document.

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