Figures index

From

Using Trityl Carbocations to Introduce Mechanistic Thinking to German High School Students

Catharina Schmitt, Michael Schween

World Journal of Chemical Education. 2018, 6(1), 18-23 doi:10.12691/wjce-6-1-4
  • Figure 1. General chemistry takes a more product-oriented view (left), whereas organic chemistry engages in process-oriented thinking (right). The workshop “carbocation watching” focusing on mechanistic pathways is designed to help students make this shift in chemical thinking
  • Scheme 1. Reaction of chlorotriphenylmethane with aluminum(III) chloride
  • Figure 2. Four out of the ten possible resonance forms for the trityl cation
  • Scheme 2. Reaction of chlorodiphenylmethane with aluminum(III) chloride
  • Figure 3. Comparative energy diagram showing the formation of the trityl cation (blue) and the benzhydryl cation (black)
  • Scheme 3. Reaction of 4,4',4''trimethoxychlorotriphenylmethane with aluminum(III) chloride
  • Figure 4. Learning chemical basic concepts by conducting the six-step workshop, interlocking theoretical and practical phases
  • Figure 5. Reaction of chlorotriphenylmethane with aluminum(III) chloride and potassium hydroxide in dichloromethane. a) shows the solution of chlorotriphenylmethane in dichloromethane, b) the solution 2 min after the addition of aluminum(III)chloride and c) the solution after the addition of 3 mL potassium hydroxide in ethanol
  • Figure 6. Reaction of chlorodiphenylmethane with aluminum(III) chloride and potassium hydroxide in dichloromethane. a) shows the solution of chlorodiphenylmethane in dichloromethane, b) the solution 2 min after the addition of aluminum(III)chloride and c) the solution after the addition of 3 mL potassium hydroxide in ethanol.
  • Figure 7. Dissociation of 4,4′,4′′-trimethoxychlorotriphenylmethane in dichloromethane. a) shows the solid reactant and b) the reactant dissolved in dichloromethane after 2 min
  • Figure 8. The reaction progress of the formation of trityl cation. Listed are the most important concepts covered in the experiments, focusing on the process-oriented approach