Biomedical subjects
Publications and source records attributed to DW Stephan.
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Dramatic developments have taken place over the last few years in the chemistry of complexes containing Zr-P bonds and their utilization in organophosphorus chemistry. This review discusses the synthesis and reactivity of compounds containing Zr-P single and double bonds, phosphazirconacycles, and Zr complexes of substituent-free phosphorus. Applications in both stoichiometric and catalytic syntheses provide access to a variety of novel organophosphorus compounds and illustrate the potential of the organometallic approach to the synthesis of main group compounds.
Long-standing tenets of a discipline must be questioned in an effort to fully understand the fundamentals of science. This is exemplified by the synthesis of planar-tetracoordinate compounds, such as the square-planar phosphonium ion 1 by Driess et al., which provide exceptions to van't Hoff - Le Bel rules.
All three C-H bonds of a methyl group are activated in the reaction of [Cp(iPr(3)PN)Ti(SR)(2)] with AlMe(3) [Eq. (1)]. The Ti-Al-carbide clusters formed contain a severely distorted tetrahedral carbide carbon atom with a relatively short bond to Ti, which is attributed to a relative increase in the Lewis acidity of the Ti center as a result of the interaction of the S and N donors with Al.