Akenes and Akynes

Last class we looked at Alkanes which is the bonding of organic chemistry.

Today we looked at alkenes and alkynes which is double and triple bonding of carbon.
Some basic notes are

• when multiple bonds form fewer hydrogen atoms are attached to carbon atoms
• Carbon always needs 4 bonds
• naming rules are almost the same
• - position of the double or triple bond has lowest number and is put in front of parent name

Alkenes

• organic compound with a double bond
• ending is changed from -ane of alkanes to -ene of alkenes

i.e. CH2=CH2  -> ethene
      CH2=CH-CH3  -> propene


Rules for naming

1. find longest Carbon chain and place at end of name
2. number the Carbon atoms to get the lowest number to start of the double bond and place the number before the parent name
3. assign names and numbers for all sides groups and assemble the name alphabetically

 Geometric Isomeres

• same chemical formula but different geometry

opposite groups on top and bottom       identical groups on top or bottom

trans-2-Butene

cis-2-Butene

Alkynes

• triple bond
• ending chaged from -ene of alkenes from -ane of alkanes to -yne for alkynes

example

 



If this is all super confusing it will get easier!