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70 Additions and corrections to the preparatory problems Problem 24: (p. 17) 6. In the structures of OxH

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70 Additions and corrections to the preparatory problems

Problem 24: (p. 17)

6. In the structures of OxH2+, OxH and Ox-, N is part of the ring, not of an attached group.

Problem 25: (p.19)

3 … change "peak is 1.15" to "peak 1.15% of the base peak".

Problem 27: (p. 20-21)

3 When treated with 2 M NaOH (under reducing conditions)

(top of p. 21) Apigenin → NaOH 2M (above arrow), Na-Hg amalgam (below arrow) Spectrum I, Compound D (C6H6O3). 200 MHz 1H-NMR (simulated spectrum (ACD- data bases). Note that phenolic H atoms do not appear due to rapid exchange.

Spectrum II, Compound E (C9H12O2): 60 MHz 1H-NMR spectrum in DMSO-d6 + CDCl3.

Problem 36: (p. 34)

C. 6. Fmoc loading: mmol/g resin=(Asample-Ablanc)/1.75 x mg of resin, or, equivalently, Fmoc loading=

m 1750

A A

m

n sample − blank

= , where n is the amount of Fmoc-amino acid attached to resin (in mmol) and m the mass of resin (in g).

Solution to problem 1: (p. 42) In the 1st equation π should be π2. Solution to problem 6: (p. 44)

The answer to the second question is A (as implied by the solution for the first question).

Riferimenti

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