The reaction below plays a special role in my career. As a newly appointed researcher (way back now), I was asked to take tutorial groups for organic chemistry as part of my duties. I sat down to devise a suitable challenge for the group, and came upon the following reaction[cite]10.1021/ja00765a062[/cite]. I wrote it down on page 2 of my tutorial book, which I still have. I continue to use this example in tutorials to this day, some 35 years later.