Off-Campus Hollins Users:
To access this document, please click here to log in to our proxy server with your campus network user name/password (the same one you use to log into the campus network and your e-mail).
Loading...
Event Type
Research Presentation
Academic Department
Chemistry
Start Date
5-4-2021 12:00 AM
Description
Two analogs of the compound dppm (Ph2PCH2PPh2) were synthesized: dppmCN (Ph2PCH(CN)PPh2) and dppmMe (Ph2PCH(CH3)PPh2). These diphosphines were subsequently used to prepare complexes of the type Re2(O2CCH3)Cl4(dppmR)2 (R = CN, CH3). The dirhenium starting material for these reactions was Re2(O2CCH3)2Cl4(H2O)2, which was prepared from commercially available (n-Bu4N)2Re2Cl8. All compounds were characterized by infrared spectroscopy. The dirhenium compounds were further characterized by cyclic voltammetry. The ultimate goal of this project is to make species of the type Re2(O2CCH3)2Cl2(dppmR)2. If we successfully prepare the cis isomer of Re2(O2CCH3)2Cl2(dppmR)2, the absence of one of the two bridgehead hydrogens in each of two dppm ligands of cis-Re2(O2CCH3)2Cl2(dppm)2 may help us to understand the reason for the unusual chemical shift of one of the –CH2– hydrogens in the H-1 nuclear magnetic resonance spectrum of the dirhenium compound that contains dppm.
Two diphosphines and the dirhenium compounds derived from them
Two analogs of the compound dppm (Ph2PCH2PPh2) were synthesized: dppmCN (Ph2PCH(CN)PPh2) and dppmMe (Ph2PCH(CH3)PPh2). These diphosphines were subsequently used to prepare complexes of the type Re2(O2CCH3)Cl4(dppmR)2 (R = CN, CH3). The dirhenium starting material for these reactions was Re2(O2CCH3)2Cl4(H2O)2, which was prepared from commercially available (n-Bu4N)2Re2Cl8. All compounds were characterized by infrared spectroscopy. The dirhenium compounds were further characterized by cyclic voltammetry. The ultimate goal of this project is to make species of the type Re2(O2CCH3)2Cl2(dppmR)2. If we successfully prepare the cis isomer of Re2(O2CCH3)2Cl2(dppmR)2, the absence of one of the two bridgehead hydrogens in each of two dppm ligands of cis-Re2(O2CCH3)2Cl2(dppm)2 may help us to understand the reason for the unusual chemical shift of one of the –CH2– hydrogens in the H-1 nuclear magnetic resonance spectrum of the dirhenium compound that contains dppm.
Comments
Under the direction of Dr. Dan Derringer.