Tue, May. 19, 2015, 4:30pm - 6:00pm
Taylor Auditorium, Frick Laboratory
Host: Paul Chirik
New Developments in Dehydrogenation of Volatile Alkanes with Ti-C Multiple Bonds.
We will present the reactivity of a transient titanium alkylidyne (PNP)Ti≡CtBu (PNP = N[2-P(CHMe2)2-4-methylphenyl]2–), specifically how this species engages in intermolecular C-H activation and functionalization reactions. Such species can dehydrogenate methane, and C2-C8 alkanes selectively at the terminal position (in the case of linear alkane C4-C8) to form the olefin product. The mechanism to this transformation as well as other new reactions such as the dehydrogenation of cyclohexane, trapping reactions, and denitrogenation of N-heterocycles (if time permitted) will be presented and discussed. A new catalytic cycle for dehydrogenation of alkanes will be also presented as well as the formation of new Ti-C mulitiply-bonded scaffolds such as phosphino-alkylidenes and alkylidynes and phosphonio-alkylidynes.