Esters and Esterification

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Esters and Esterification

description

Esters and Esterification. Write condensed structural formulas for and name esters . Include : uses and functions of common esters Additional KEY Terms esterification. carbonyl group. O. alkoxy group. R. O. C. O. The functional group of esters is the ester group - PowerPoint PPT Presentation

Transcript of Esters and Esterification

Page 1: Esters and Esterification

Esters and Esterification

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• Write condensed structural formulas for and name esters.

Include: uses and functions of common esters

Additional KEY Termsesterification

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The functional group of esters is the ester group

• general formula: R–COOR'R - hydrocarbon chain from the acid R' - hydrocarbon chain from the alcohol.

O

O CR O

carbonyl group

alkoxy group

R'

• made by combining carboxylic acid and alcohol

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alcoholcarboxyl acid

H

C-C

O

O H O-C

ester

waterEsterification is a reversible reaction.

DE-esterification

Esterification

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Properties of Esters:

• Polar covalent: < 5C (small) are soluble in water

O

O CR O

δ+δ-

• Large esters account for flavour / odor of fruit

• Strong IMF (d-d) gives high bp/mpBut lower than alcohol/acids – NO H-bonding

R'

Ester Odorisoamyl acetate bananamethyl salicylate wintergreenethyl butyrate pineapplebenzyl butyrate cherrybenzyl acetate peachmethyl butyrate appleoctyl acetate orangen-propyl acetate pearethyl phenylacetate honeyethyl acetate fingernail polish remover

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· First name alcohol: change - anol to - yl· Second name acid: change - ioc acid to - oate

Naming Esters2 – names:

CH3COOCH2CH2CH3

propyl ethanoate

CH3-C

O

\O-CH2CH2CH3

// alcohol

acid

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CH3CH2CH2CO + OCH3

butanoic acid methanol

CH3CH2CH2COOCH3 + H2O

methyl butanoate water

OH H

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CH3CH2CH2CH2CH2COOCH2CH2CH2CH3

butyl hexanoate

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Write the esterification reaction for the reactionbetween pentanoic acid and 1-butanol.

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CAN YOU / HAVE YOU?

• Write condensed structural formulas for and name esters.

Include: uses and functions of common esters

Additional KEY Termsesterification