# 1. I went and bought “Transition Metals in the Synthesis of Complex Organic Molecules” by Hegedus and Soderberg on the advice of the chair of the chemistry department at my alma mater. There on p. 3 is a diagram of the d electron configuration of the Transition Metals. But there are only 8 columns. What happened to Sc, Y, Lu, Zn, Cd, Hg? They aren’t metals? Is this because the d shell of these elements is empty (Sc Y, Lu) or full (Zn, Cd, Hg) ?
#2. There’s a brand new book out on the same subject by Hartwig. I picked it up at a local college library — certainly my best spent $35 of the year. They have a fabulous shelf of just the new arrivals, which means that their faculty is doing my intellectual legwork. The book is so new that it doesn’t have a review on Amazon. Any thoughts on how good (or bad) it is? It is 3 times the (physical) size of Hegedus. It’s probably more advanced than Hegedus, as Hartwig does not define neta(n) which Hegedus does on p. 4.
#3. One can regard one resonance structure of the ylid (Phenyl)3 P – CH2 as having a positive charge on the P and a negative charge on the C. The other resonance structure has a double bond between the P and C. If the latter, where do the ‘extra’ electrons go — presumably into a d orbital on the P. But which one? What is its spatial orientation? Clayden is silent.
#4. Clayden admits that the details of the nuclear Overhauser effect are ‘beyond the scope of this book’ (p. 846). The Wikipedia entry is quite brief and unsatisfying. It seems that pumping one nucleus to an excited state (and keeping it there) helps its nearby neighbors drop down from their excited state (enhancing the signal they emit, in volume, not in location). How does this happen? Given that the effect is quantum mechanical, there may not be an appropriate analogy at the macroscopic level. Any suggestions of what to read?
Finally, to James who posted a lot of answers to earlier questions. Many thanks. I should be able to interpolate them in the appropriate post this week, now that I’ve got things categorized. Here are some more questions.