July 21 '05
1. Write the structures of the following molecules:
a) 2,3-dihydroxy-4-metilesanale b) (2S) 2-Amino-3-methylpentane; c) dimetilciclobutanolo 1,2-d) (2E, 4Z) -2,4 hexadiene-e) acid, 2,4-dimethyl-3-nitrobenzoate.
2. Draw all possible stereoisomer of 2,3-dihydroxy butandioco.
3. Write entries for the second increasing acidity of the molecules listed below: a) 2-nitrophenol b) 4-methylphenol; c) 2-methyl-cyclohexanol; d) acid 2-fluoropropanoico e) iodoesanoico acid 3-f) 1, 1.2-trimetilciclopropano.
4. Explain why the hydrocarbon 1,3-cyclopentadiene acts as an acid (pKa ≈ 15) while the cyclopentene no (pKa ≈ 40).
5. Write the structure of a) an L-amino acid, b) a D-chetopentoso c) a monoglyceride d) a nucleotide e) an acetal.
1. Write the structures of the following molecules:
a) 2,3-dihydroxy-4-metilesanale b) (2S) 2-Amino-3-methylpentane; c) dimetilciclobutanolo 1,2-d) (2E, 4Z) -2,4 hexadiene-e) acid, 2,4-dimethyl-3-nitrobenzoate.
2. Draw all possible stereoisomer of 2,3-dihydroxy butandioco.
3. Write entries for the second increasing acidity of the molecules listed below: a) 2-nitrophenol b) 4-methylphenol; c) 2-methyl-cyclohexanol; d) acid 2-fluoropropanoico e) iodoesanoico acid 3-f) 1, 1.2-trimetilciclopropano.
4. Explain why the hydrocarbon 1,3-cyclopentadiene acts as an acid (pKa ≈ 15) while the cyclopentene no (pKa ≈ 40).
5. Write the structure of a) an L-amino acid, b) a D-chetopentoso c) a monoglyceride d) a nucleotide e) an acetal.
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