Synthesis, characterization and silylcyanation reactivity of (η5-C5Ph4H)MCl4 (M=Nb, Ta): Group 5 supersize piano stools

INOR 168

Wayne Tikkanen, wayne@calstatela.edu1, Danielle T. Barrios2, Tiffany C. Kwong2, Pamela Lee, pamlee823@gmail.com2, and J. Bernardo Lepe2. (1) Department of Chemistry and Biochemistry, California State University, 5151 State University Drive, Los Angeles, CA 90032, (2) Department of Chemistry and Biochemistry, California State University--Los Angeles, 5151 State University Drive, Los Angeles, CA 90032
Two group 5 transition metal compounds, tetraphenylcyclopentadienyl niobium tetrachloride [η5-C5H(C6H5)4)NbCl4] (1) and tetraphenylcyclopentadienyl tantalum tetrachloride [η5-C5H(C6H5)4)TaCl4] (2) were synthesized and characterized by 1H and 13C{1H} NMR. The purple-brown niobium complex 1 and the tantalum homologue 2 were synthesized in 46% and 50% unoptimized yields, respectively. The recrystallization of 1 in CH2Cl2 rendered purple crystals. Complexes 1 and 2 display remarkably similar 1H-NMR spectra and similar 13C-NMR. Complex 1 promotes the silylcyanation of butyraldehyde: a 1 mole % loading leads to complete conversion in 18 hrs at room temperature at which point there is less than 5% conversion in the control. Further characterization of these complexes and the scope of silylcyanation reactivity of 1 and 2 will be reported. Preliminary results of the reactions of these complexes to form chiral alkoxide complexes will also be presented.

 

Applications of Organometallic Chemistry
7:00 PM-10:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, August 20, 2007 BCEC -- Exhibit Hall - B2, Sci-Mix

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007