Leucine1,2
Three Letter Representation: Leu
Two Letter Representation: L
IUPAC Name: (2S)-2-amino-4-methylpentanoic
acid
Formula: C6H13NO2
Molecular Weight: 131.2
Acidic, Neutral, or Basic: Neutral
pKas: For α-COOH = 2.33, for β-NH3+ =
9.74
pI: 6.04
Isoleucine1,2
Three Letter Representation: Ile
Two Letter Representation: I
IUPAC Name: (2S,3S)-2-amino-3-methylpentanoic
acid
Formula: C6H13NO2
Molecular Weight: 131.2
Acidic, Neutral, or Basic: Neutral
pKas: For α-COOH = 2.32, for β-NH3+ =
9.76
pI: 6.04
Structures of these amino acids are given below. On ball and stick representations, only hydrogens on stereogenic carbons are shown.
References:
1) Smith, J. Organic Chemistry, 3rd ed.; McGraw-Hill:
New York, 2011; 1076
2) Smith, J. Organic Chemistry, 3rd ed.; McGraw-Hill:
New York, 2011; 1078
3) ACD ChemSketch,
version 2009; Advanced Chemistry Development, Inc.; (Accessed March 2, 2013).
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