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. Author manuscript; available in PMC: 2010 Aug 6.
Published in final edited form as: Org Lett. 2009 Aug 6;11(15):3430–3433. doi: 10.1021/ol901283m

Figure 1.

Figure 1

[4 + 2] Versus [4 + 3] Cycloadducts.

δppm: 6.60 (s, Ha); 2.53 (dd, Hb, J = 4.5, 14.0 Hz); 1.91 (d, Hc, J = 14.0 Hz) 5.02 (dd, Hd, J = 1.5, 4.5 Hz); 6.32 (d, He, J = 5.5 Hz); 6.04 (d, Hf, J = 5.5 Hz)