A case study in biomimetic total synthesis: polyolefin carbocyclizations to terpenes and steroids.

@article{Yoder2005ACS,
  title={A case study in biomimetic total synthesis: polyolefin carbocyclizations to terpenes and steroids.},
  author={Ryan A. Yoder and J. N. Johnston},
  journal={Chemical reviews},
  year={2005},
  volume={105 12},
  pages={
          4730-56
        }
}
I would like to give a warning, from a theoretical point of view, about all the carbonium ion mechanisms. They are all probably concerted reactions with a beginning and an end, and the reason you write down your carbonium mechanisms in the way you do is chiefly because in writing down on paper you are bound to write something first and then something else afterwards, and the human mind is not quick and clever as the enzyme. 
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