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SC CHEM 334 - Amines

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Chem 334 1st Edition Lecture 22Outline of Last Lecture I. Michael additionsOutline of Current Lecture II. AminesIII. NomenclatureIV. Physical propertiesCurrent LectureAmines:Amines are classified as primary, secondary or tertiary based on the number of R groups attached to them. There are two kinds of amines, aliphatic amines and aromatic amines.Aliphatic amines just have alkyl groups attached to the amine:NH2Aromatic amines are just amines attached to aromatic rings, such as aniline:NH2– When you put the nitrogen within an aromatic ring, you get a heterocycle amine: N N N Pyrrolidine Piperidine PyridineNomenclature:When naming amines, drop the e off of the name of the parent alkane and add “amine” to the end of it. Use numbering to indicate where the amine is located. For chains with multiple amines, add “di” or “tri” in front of “amine” >–NH2 NH2 NH22-Propanamine 1,4-butandiamineFor primary or tertiary amines, use N-substituent and the name of the primary amine. N N These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.N,N-Diethylpentanamine N-methyl-1-butanamineAmines have lower priority over other functional groups, meaning that the amine can be considered a substituentPhysical properties:Amines are polar compounds. Primary and secondary amines can hydrogen bond. When hydrogen bondscan form, the boiling point and solubility of the molecule is increased, compared to a molecule that cannot form hydrogen bonds.Amines are weak bases with a pka of about 9 to 11. All aliphatic amines have about the same pka. Aromatic amines, on the other hand, will have a lower pka. This is because the lone pair on the nitrogen can resonate into an aromatic


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SC CHEM 334 - Amines

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