Fatty Acids Unbranched carboxylic acids with 12-20 carbons. Most contain an even number of carbons because they are built from acetic acid units. Melting points increase with increasing molecular weights. Unsaturation greatly lowers the melting point
Fatty Acids ◼Unbranched carboxylic acids with 12-20 carbons. ◼Most contain an even number of carbons because they are built from acetic acid units. ◼Melting points increase with increasing molecular weights. ◼Unsaturation greatly lowers the melting point
Fats and Oils Most fats have saturated fatty acids. Most oils have unsaturated fatty acids. CH一O CH2-O一( tristearin,mp 72C CH-0- CH2一O triolein,mp-4C
Fats and Oils ◼Most fats have saturated fatty acids. ◼Most oils have unsaturated fatty acids
Saponification ■“Soap-making” Base-catalyzed hydrolysis of ester linkages in fats and oils. Ct-0-C(CCHs CH2-OH CH-OH 0 CH-0-C-(CH2)CH CH2-OH 3 NaOH 0 0 CH-0-C-(CH2CH +3Na*O-C- CH2)16CH3 A soap
Saponification ◼“Soap-making” ◼Base-catalyzed hydrolysis of ester linkages in fats and oils. CH O C O (CH2 )16CH3 CH2 O C O (CH2 )16CH3 CH2 O C O (CH2)16CH3 + 3 NaOH CH2 CH CH2 OH OH OH + 3 Na+ - O C O (CH2 )16CH3 A soap
Soap Structure Ionic head C05 boundary of water into structure Hydrocarbon tail
Soap Structure