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. Author manuscript; available in PMC: 2021 May 12.
Published in final edited form as: Synlett. 2019 Nov 27;31(2):102–116. doi: 10.1055/s-0039-1691501

Scheme 2.

Scheme 2

In 1960, E. J. Corey and Hertler determined that in some traditional HLF reactions, where position-selectivity arises predominantly from 1,5-HAT processes, minor products can form through 1,6-HAT processes.