Patai rule

The selection of compounds reviewed in this chapter deviates from the Patai rule , which states7 that only compounds containing C—Au and C—Ag bonds should be discussed. The aim is to describe how the electronic structure of silver and gold is affected by the presence of organic ligands, irrespective of whether or not the formal donor atom is carbon. 

See the lUPAC rules Guthrie, R.D. Pure Appl. Chem., 1989, 61, 23. As given here, the lUPAC designations for BacI and BalI are the same, but Rule A.2 adds further symbols so that they can be distinguished Su-AL for BalI and Su-AC for BacI- por reviews of the mechanisms of ester hydrolysis and formation, see Kirby, A.J. in Bamford Tipper, Ref 193, vol. 10, 1972, p. 57 Euranto, E.K. in Patai, Ref 216, p. 505. This is an Sn 1 mechanism with OR as leaving group, which does not happen. 

Physical basis of Hund s rule (a) J. A. Berson, in The Chemistry of the Quinonoid Compounds, Vol. II, S. Patai and Z. Rappoport, Eds., John Wiley Sons, Inc., New York, 1988. (h) W. Kutzelnigg, Friedrich Hund and Chemistry, Angew. Chem. Inti. Ed. Engl. 1996, 35, 573. 

Helicity rules have been developed which can be applied to inherently dissymmetric chromophores, such as, e.g. the enone chromophore shown in Figures 12 and 13, where the chosen atoms are only approximately on a helical line. Many papers have been published concerning the enone chromophore as summarized in Patai and Rappoport by Gawronski. 

---