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. Author manuscript; available in PMC: 2008 Nov 25.
Published in final edited form as: Org Lett. 2005 Sep 29;7(20):4539–4542. doi: 10.1021/ol051975x

Table 1.

Cycloaddition Concentration Dependence

compound conc. (mM) % yield 5a or 5b
4aa 5 mM 27-34%
4aa 1 mM 43%
4aa 0.1 mM 50%
4aa 0.05 mM 53%
4bb 100 mM 38%
4bb 50 mM 58%
4bb 10 mM 86%
4bb 5 mM 90%
4bb 1 mM 99%
a

Condition: 230 °C, TIPB, 90 h.

b

Condition: 230 °C, TIPB, 20 h.