DuPontYoung Faculty Award as well as by DuPont Agrochemical, Amoco, and Hoechst Celanese Corporation. We acknowledge a generous loan of precious metals from Johnson Matthey Inc. We thank Supelco for a gift of a b-DEX GC column and Professor Tim Glass for helpful suggestions.PennPhos P,P'-1,2-phenylenebis(endo-2,5-dialkyl-7phosphabicyclo[2.2.1]heptane)
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