1,2-Bis(diisopropylphosphino)ethane (dippe) is a commonly used bidentate ligand in coordination chemistry. This compound is similar to the ligand 1,2-bis(diphenylphosphino)ethane (dppe), with the substitution of isopropyl groups for phenyl groups.
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1,2-Bis(diisopropylphosphino)ethane Wikipedia(Text) CC BY-SA