PART 18: DGM RULES (DAVIES GREEN MINGOS RULES) FOR CSIR NET

In organometallic chemistry, the Green–Davies–Mingos rules predict the regiochemistry for nucleophilic addition to 18-electron metal complexes containing multiple unsaturated ligands. The rules were published in 1978 by organometallic chemists Stephen G. Davies, Malcolm Green, and Michael Mingos. They describe how and where unsaturated hydrocarbon generally become more susceptibile to nucleophilic attack upon complexation. Rule 1 Nucleophilic attack is preferred on even-numbered polyenes (even hapticity) Rule 2 Nucleophiles preferentially add to acyclic polyenes rather than cyclic polyenes. Rule 3 Nucleophiles preferentially add to even-hapticity polyene ligands at a terminus. Nucleophiles add to odd-hapticity acyclic polyene ligands at a terminal position if the metal is highly electrophilic, otherwise they add at an internal site. ORGANOMETALLIC CHEMISTRY:    • PART 1: HAPTICITY IN ORGANOMETALLIC COMPOUNDS   #DGM #RULES #NUCLEOPHILICADDITIONTOPOLYENES #HOMO #LUMO