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We have isolated spherical-shaped monodispersed 12–14 nm range gold nanoparticles, when o-1,6-allenylbenzaldehyde underwent a novel mode of tandem cycloaddition and cyclization using AuCl3 precatalyst. This cyclization can be found in the construction of many polycyclic natural product skeletons.
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Gupta et al. (2005) studied this question.
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