Chapter 7 Alkenes and Alkynes 1 Flashcards
What are the simplest alkene and alkyne possible?
Simplest alkene: Ethylene
Simplest Alkyne: Acetylene
What is the structure in the image?
Ethylene
The simplest alkene
What is the molecule in the image?
Propylene OR
1-propene (prop-1-ene)
What is the relationship between the two molecules/
Diastereomers
What is the difference between the E and Z stereochemistry?
- E: entegegan = opposite
- highest substituents are on opposite sides
- Z: zusammen = Same
- highest substituents are on the same side
Are the compounds the same?
No, they are diastereomers and we can differentiate them by using the E and Z nomenclature
What is the functional group in the image?
Vinyl group
eg:
Vinyl chloride
(1-chloroethene)
What is the functional group in the image?
Provide an example of a compound with the functional group
CH3CH=CH−X
Allyl group or “Propenyl Group”
Eg
Allyl chloride
(3-chloropropene)
Cl—C—C=C
What is the functional group in the image?
Provide an example of a compound with the functional group
Benzyl group
eg: Benzyl bromide
6-member benzene with CH2
What is the functional group in the image?
Provide an example of a compound with the functional group
Phenyl group
eg: Phenyl bromide “bromobenzene”
What are the four naming rules for alkynes?
- Find longest chain w/ max number of multiple bonds
- Number from end to give 1st multiply bonded position the lowest number
- Drop “ane” and add “yne”
- For multiple triple bonds, drop the ne and add diyne, triyne etc
What is the compound in the image?
Ethyne
“Acetylene”
What are the names of the three compounds?
Are they related?
Propyne
1-butyne
2-butyne
- 1-butyne and 2-butyne are structural isomers
What is the name of the compound?
2,4 - Octadiyne
What is the name of the compound?
- 13 Carbons = trideca
- triple bond (triyne) on 5, 7, 9
- 3 double bonds (triene) on 1, 3, 11
- 3=4 E (opposite)
- 11=12 E (opposite)
= 3E,11E-trideca-1,3,11-triene-5,7,9-triyne
What is the relative polarity of alkanes, alkenes and alkynes?
Alkynes > Alkenes > Alkanes
most polar -> least polar