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. Author manuscript; available in PMC: 2016 Jan 2.
Published in final edited form as: Science. 2015 Jan 2;347(6217):56–60. doi: 10.1126/science.1261232

Fig. 2. Effects of counterion structure and ring strain.

Fig. 2

nbd = 1,5-norbornadiene, nbe = norbornene, bnbd = benzonorbornadiene; yields were determined by GC-FID analysis of the reaction mixtures using durene as an internal standard.