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Carboxylic Acids. Unit 6. General Formula. RCOOH and ArCOOH Functional Group = O C -OH. Common Names…. 1C – Formic Acid ( Methanoic Acid) From Formaldehyde ( methanal ) 2C – Acetic Acid ( Ethanoic Acid) From Acetaldehyde ( ethanal ) 3C – Propanoic Acid ( Propanoic Acid) - PowerPoint PPT Presentation
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Carboxylic AcidsUnit 6
General Formula
RCOOH and ArCOOHFunctional Group =OC -OH
Common Names…1C – Formic Acid (Methanoic Acid)
From Formaldehyde (methanal) 2C – Acetic Acid (Ethanoic Acid)
From Acetaldehyde (ethanal)3C – Propanoic Acid (Propanoic Acid)
From Propanaldehyde (propanal)4C – Butyric Acid (Butanoic Acid)
From Butyraldehyde (butanal)
Uses – Just FUN Facts – Not Tested!Formic Acid – First Isolated from Ants
Used in dyeing and finishing textiles and many other uses!
Acetic Acid – Naturally produced by usAka vinegar – many uses
Propanoic Acid – in Greek, means “first fat”Grain Preservative and antifungal
Butyric Acid – Naturally occurring – Greek for butterSmells like vomit
Preparation of Carboxylic Acids – You already know this
Oxidation of aldehydes O KMnO4 O R-C-H R-C-OHRCHO KMnO4 RCO2H
ExampleForm Pentanoic Acid (S,C,N)
Reactions of Carboxylic Acids
1.Halogenation: RCO2H + X2 RXCO2H + HXArCO2H + X2 FeX3 ArXCO2H + HXForm 2,3,4 – trichloroheptanoic acid (str,cond) O Cl Cl Cl OC-C-C-C-C-C-C-OH + 3Cl2 C-C-C-C-C-C-C-OH +3HClCH3(CH2)5CO2H + 3Cl2CH3(CH2)2(CHCl)3CO2H + 3HCl
Examples of Halogenation
Form paraiodobenzenoic acid (str) + I2 FeI3 + HI I
Reactions of Carboxylic Acids
2. Nitration of benzanoic acidArCO2 + HNO3 H2SO4 ArNO2CO2H + H2OForm metanitrobenzanoic acid
(str,cond)
Reactions of Carboxylic Acids
Acid Salt formation can be done 2 ways…1.RCO2H + M° ArNO2CO2H + H2OMetal can be same 7 as before
ExamplesReact ethanoic acid with sodium (str,name,cond) O O 2C-C-OH + 2Na2(C-C-O-)Na+ + H2
2CH3CO2H+2Na2(CH3CO2-)Na+ +H2
Sodium ethanoate
Examples
To name acid salts:1.Name Metal ion2.Drop –ic acid and add –ateEx: React butyric acid with
magnesium (str,cond,name)
Acid Salt Formation – 2nd Way!
2. Carboxylic acid + metal hydroxide acid salt + water
RCO2H + MOH(RCO2-)M+ + H2O
React butanoic acid with magnesium hydroxide (str,cond, name prod)
Example
React propanoic acid with aluminum hydroxide (str, cond, name product)
Other Reactions of Carboxylic Acids
Convert carboxylic acids to “functional derivatives”Functional Derivative – an organic compound containing the acyl group OAcyl group = RCO = R-C-
Conversion to acid chlorides
O O4. R-C-OH + SOCl2 R-C-Cl + SO2 + HClRCO2H + SOCl2 RCOCl + SO2 + HClCarboxylic acid + thionyl chloride acid
chloride + sulfur dioxide + hydrogen chloride
Examples
React hexanoixc acid with thionyl chloride (s,c,np) O OC-C-C-C-C-C-OH + SOCl2C-C-C-C-C-C-Cl + SO2+HClCH3(CH2)4CO2H + SOCl2 CH3(CH2)4COCl + SO2+HClTo name acid chlorides:1.Drop –ic acid2.Add –yl chloride
Conversion to amides
5. Converting carbox. Acids to amides O H O HR-C-OH + H-N-H R-C-N-H + H2OCarboxylic acid + ammonia amide + water
Example
Rct pentanoic acid w/ammonia (s,c,np) O H O HC-C-C-C-C-OH + H-N-H C-C-C-C-C-N-H + H2OCH3(CH2)3COH + NH3 CH3(CH2)3CONH2 + H2OTo Name Amides: pentanimide1. Drop –e from corresponding alkane2. Add –amide
Conversions to Esters
Fischer Esterification O OR-C-OH + R’-OH H2SO4 R-C-O-R’ + H2ORCO2H + R’OH H2SO4 RCO2R’ + H2OCarboxylic acid + alcoholester + water
Example
React propanoic acid with butanol (s,c,np) O OC-C-C-OH + C-C-C-C-OH H2SO4 C-C-C-O-C-C-C-C + H2OCH3CH2CO2H + CH3(CH2)2CH2OH
H2SO4 CH3CH2CO2(CH2)3CH3+ H2O butyl propanoate
Naming Esters
To Name Esters:1.Name R’ side as chain (from
alcohol)2.Drop – ic acid add – ateEX: form Propyl Butanoate (s,c,nr)