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. Author manuscript; available in PMC: 2015 Feb 10.
Published in final edited form as: Chemistry. 2013 Dec 5;20(7):2010–2015. doi: 10.1002/chem.201303410

Figure 3.

Figure 3

Synthesis of tCO analogues. Yields are (a) 85%, (b) over two steps, 6b 40%, 6c 48%, 6d 41%, 6e 20%, 6f 61%, 6g 44%, (c) 1b 20%, 6c 11%, 1d 24%, 1e 3%, 1f 11%, 1g 53%. The parent tCO 1a was synthesized using the original procedure.[34]