Aldehydes SCH 4UI Mr.Snyder Culminating Project Sherry Wong Aly Kadar Kasey Bourgon.

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Presentation transcript:

Aldehydes SCH 4UI Mr.Snyder Culminating Project Sherry Wong Aly Kadar Kasey Bourgon

Define: Aldehydes An organic compound characterized by a terminal carbonyl functional group

Functional group Terminal Carbonyl group (C=O) + One H atom bonded to C + R (Either another H atom or an alkyl group [carbon chain]) ∴ Carbonyl group always occurs at the end of a carbon chain General Structure

The H atom is attached to the C in the carbonyl group IUPAC: Methanal Common name: Formaldehyde Functional Group: Another H atom

Functional Group: Alkyl Group Attached to the C in the carbonyl group o Examples 1. Cyclohexanal 2. IUPAC: Ethanal (Common Name: Acetaldehyde)

Functional group Carbonyl group (C=O) + One H atom bonded to C + R (Either another H atom or an alkyl group [carbon chain]) ∴ Carbonyl group always occurs at the end of a carbon chain General Structure

Difference between ALDEHYDES & KETONES Carbonyl Group Aldehydes Ketones

Nomenclature: A Change of Suffix Ex: Methane -> Methanal (AKA: Formaldehyde) ★ Carbonyl group always at the end of the carbon chain ★ Replace the -ane at the end of the name with an -al ○ aldehyde

Boiling Point: Lower than analogous alcohols (ex. Ethanol - 78°C / Ethanal - 21°C) H-Bonds:N/A (because there is no OH [hydroxide] groups) Polarity:Strong polar group (due to double C=O bond) (electronegativity) Solubility: High Physical & Chemical Properties

Everyday Life Uses Smaller → Strong, unpleasant odours HYDROGEN ATOM Formaldehyde (aka. IUPAC name = Methanal) Simplest aldehyde Colourless room temperature In (aq) solution = antiseptic and disinfectant Used as a preservative ONE CARBON Acetaldehyde (aka. IUPAC name = Ethanal) Colourless liquid Synthesis of resins, dyes, and preservatives

Trimer = 3 molecules joined together into a single large molecule Formaldehyde Fumigate rooms against pests Acetaldehyde Hypnotic drug

Larger → Flowery, pleasant odours Ex. Cinnamaldehyde Found in essential oils of plants (ex. Frankincense egyptian and Rosalina Austrialian essential oils) Used for fragrance in perfumes and aromatherapy products o Aldehydes are refered to as aliphatic or "fatty" aldehydes o Fatty aldehydes have a chain of 8-13 carbon atoms (ex. Chanel No.5 Perfume) Everyday Life Uses

Reactions Kasey

Reaction Worksheet Kasey

Bibliography Kessel, H. v., Jenkins, F., Davies, L., Plumb, D., Giuseppe, M. D., & Lantz, O. (2003). Nelson Chemistry 12. Toronto: Kevin Martindale. Aldehydes. (n.d.). perfume ingredient, fragrance and essential oils. Retrieved November 25, 2013, from