- Expanding the range of "Daniphos"-type P∩P- and P∩N-ligands: Synthesis and structural characterisation of new [(η6-arene)Cr(CO)3] complexes
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New P∩P- and P∩N-ligands have been synthesised whose core structure is an [(η6-arene)Cr(CO)3] unit. These new ligands, which extend the range of "Daniphos" ligands, are endowed with central and planar chirality and have been prepared through a stereoselective synthetic strategy from optically pure benzylamines bearing a second substituent on the arene other than the benzyldimethylamino group. Because the two faces of unsymmetrically 1,2- and 1,3-disubstituted benzylamine are diastereotopic, which means that diastereomeric complexes arise upon coordination of the Cr(CO) 3 fragment to either of these two faces, the synthetic plan has been adjusted by exploiting the trimethylsilyl group as a temporary steric modulator in order to access both complexes with high diastereoselectivity. Wiley-VCH Verlag GmbH & Co. KGaA, 2007.
- Alberico, Elisabetta,Braun, Wolfgang,Calmuschi-Cula, Beatrice,Englert, Ulli,Salzer, Albrecht,Totev, Daniel
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p. 4923 - 4945
(2008/09/17)
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- CsOH-promoted P-alkylation: A convenient and highly efficient synthesis of tertiary phosphines
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A mild and efficient method for the synthesis of tertiary phosphines and ditertiary phosphines has been developed. In the presence of cesium hydroxide, molecular sieves and DMF at room temperature, various secondary phosphines and alkyl bromides were examined, and the results have demonstrated that this methodology offers a general synthetic procedure to produce tertiary phosphines in moderate to high yields. Optically active tertiary phosphine synthesis is also described.
- Honaker, Matthew T.,Sandefur, Benjamin J.,Hargett, James L.,McDaniel, Alicia L.,Salvatore, Ralph Nicholas
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p. 8373 - 7377
(2007/10/03)
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