Based on the literature reference, this activity allows students to discover inner-sphere and outer-sphere catalytic hydrogenation mechanisms then apply their knowledge to hydroborylation. This is a guided-inquiry in-class activity that students can complete in small groups or individually with instructor support.
The student will be able to...
1. Compare and contrast mechanisms for inner- and outer-sphere catalytic hydrogenation.
2. Predict behavior of more polar and less polar substrates.
3. Compare H2 to E-H as a substrate.
4. Compare hydrogenation to hydroborylation with respect to mechanisms.
This activity is intended to be used in class by small groups of students. They may or may not have previously read the JACS paper on which it is based, but they should have some understanding of: organic chemistry, metal atom oxidation states, coordination numbers, basic types of organometallic reactions (oxidative addition/reductive elimination). If the activity requires more time than the class period, or by instructor choice, one or more of the final application questions can be assigned as homework/used as exam questions.
Note that all ligands in the catalytic cycles are assumed to be "L" type.
Some or all of the student answers may be collected for grading. One or more of the application questions may be used as a quiz/exam question. Instructor should also observe the students as they work and determine whether they are understanding the important points as they progress through the activity; be prepared to step in to assist.
This activity has not yet been used in the classroom.