1. For example
see: aStraumanis, A. Organic Chemistry: A Guided Inquiry, 2nd ed. Houghton Mifflin: Boston, MA, 2009; p 164.
2. bKlein, D. Organic Chemistry, 3rd ed. Wiley: Hoboken, NJ, 2017; pp 210–211.
3. cKarty, J. Organic Chemistry: Principles and Mechanisms, 2nd ed. Norton: New York, NY, 2018; p 219.
4. dWade, L. G.; Simek, J. W. Organic Chemistry, 9th ed. Pearson: Glenview, IL, 2017; pp 224–225.
5. eLouden, M. Organic Chemistry, 5th ed. Roberts & Co.: Greenwood Village, CO, 2009; pp 251–253, 682–683.