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5 USEFUL METHODS OF AMINO ACIDS

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5 USEFUL METHODS OF AMINO ACIDS

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  1. 5 USEFUL METHODS OF AMINO ACIDS www.assignments4u.com

  2. METHOD#1 Amination of alpha-bromocarboxylic acids provides a straight forward method for preparing alpha- amino carboxylic acids. The bromoacid are conveniently prepared from carboxylic acids by reaction with Br2 + PCl3.

  3. METHOD#2 By modifying the nitrogen as a phthalimide salt the propensity of amines to undergo multiple substitutions is removed, and a single clean substitution reaction of 1º- and many 2º-alkylhalides takes place.

  4. METHOD#3 An elegant procedure known as the Strecker synthesis, assembles an alpha-amino acid fromammonia(the amine precursor), cyanide (the carboxyl precursor) and an aldehyde. Thisreactionis essentially an imino analog of cyanohydrin formation. The alpha-amino nitrileformedin this way can then be hydrolyzed to an amino acid by either acid or base catalysis.

  5. METHOD# 4 Resolution The three synthetic procedures described above and many others thatcanbe conceived, give racemic amino acid products. If pure L or D enantiomers aredesired, it is necessary to resolve these racemic mixtures. A common method of resolving racemates is by diastereomeric salt formation with apurechiral acid or base.

  6. METHOD # 5 Resolution The three synthetic procedures described above and many others thatcanbe conceived, give racemic amino acid products. If pure L or D enantiomers aredesired, it is necessary to resolve these racemic mixtures. A common method of resolving racemates is by diastereomeric salt formation with apurechiral acid or base.

  7. Get Help with Amino Acids Assignment assignments.a4u@gmail.com +1-225-590-7248 www.assignments4u.com

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