How can we help?

You can also find more resources in our Help Center.

20 terms

O-Chem

Exam #2 Lectures 5-8
STUDY
PLAY
3 ways you know a compound is oxidized
-loses electrons
-loses hydrogens
-gains oxygen
What do thiols need to react with in order to be water soluble and why?
strong bases, in order to form water-soluble salts. thiols are weak acids and do not readily dissove in water
Dehydration
forms water, required heat and acid catalysts
oxidation results
aldehyde to carboxylic acid to a ketone
simplest aldehyde?
formaldehyde (methanal)
why are aldehydes and ketones polar molecules?
they both have alkyl groups attached to them which are nonpolar. The overall polarity of the molecule comes from the carboxyl group. The C is partially postive, the O is partially negative
Discuss the BP of aldehydes and ketones
-no hydrogen bonding
-both have a lower BP than alcohol and carboxylic acids of comparable molecular weight
-weak intermolecular forces of attractions
Remove 2 Hydrogens
oxidation
Remove 2 Hydrogens and 1 Oxygen
Dehydration
what does dehydration require?
heat and acid catalyst (H2SO4)
what does oxidation require?
K2CR2O7 and H2SO4
oxygen between 2 carbons:
ether
ethers are polar or nonpolar?
polar
combustion reaction
reacts with O2 to get CO2 + H2O, then balance
Thiols always include
S-H
Can thiols hydrogen bond in water?
Yes
Thiols are weak acids, just like:
phenols
Thiols react to:
strong bases like NaOH to form water soluble salts
Oxidation of 2 thiols =
Disulfide

CH3-S-H H-S-CH2-CH3 to CH3-S-S-CH2-CH3
Reduction of disulfide =
2 thiols