The core course coordinator is Prof. Jason C.-Y. Ho.
The course content included but not limited to how the electron counts and complex structural features may affect the
reaction pathways, and it will illustrate how the combinations may achieve the desired selectivity and reactivity.
Those will be distributed in the Fall semester throughout accordingly.
The course consists of 3 credits, which will focus on
A) Organometallic Chemistry (16 hrs),
- Introduction on Organometallic Chemistry (2 hrs: basic idea and the general)
- Electron counting (4 hrs, distributed equally: 18 electron rule, conformation, structures)
The 18-electron rule is a rule used primarily for predicting and rationalizing formulae for stable metal complexes,
especially organometallic compounds. The rule is based on the fact that the valence shells of transition metals consist of
nine valence orbitals (one s orbital, three p orbitals and five d orbitals), which collectively can accommodate 18 electrons
as either bonding or nonbonding electron pairs. This means that, the combination of these nine atomic orbitals with
ligand orbitals creates nine molecular orbitals that are either metal-ligand bonding or non-bonding.
Electron counting is a formalism used for classifying compounds and for explaining or predicting electronic structure and
bonding. Many rules in chemistry rely on electron-counting
- Common organometallic complexes (10 hrs, distributed equally: H, C, pi, CO and Carbene)
Transition metal hydrides are chemical compounds containing a transition metal bonded to hydrogen. Most transition
metals form hydride complexes and some are significant in various catalytic and synthetic reactions. The term "hydride"
is used loosely: some so-called hydrides are acidic (e.g., H2Fe(CO)4), whereas some others are hydridic, having H−-like
character (e.g., ZnH2).
Transition metal alkene complex is a coordination compound containing one or more alkene ligands. Such compounds
are intermediates in many catalytic reactions that convert alkenes to other organic products.
Metal carbonyls are coordination complexes of transition metals with carbon monoxide ligands. Metal carbonyls are
useful in organic synthesis and as catalysts or catalyst precursors in homogeneous catalysis, such as hydroformylation
and Reppe chemistry. In the Mond process, nickel carbonyl is used to produce pure nickel. In organometallic chemistry,
metal carbonyls serve as precursors for the preparation of other organometalic complexes.
In organometallic species, metal complexes with the formulae LnMCRR' are often described as carbene complexes.
Such species do not however react like free carbenes and are rarely generated from carbene precursors, except for the
persistent carbenes. The transition metal carbene complexes can be classified according to their reactivity, with the first
two classes being the most clearly defined:
• Fischer carbenes, in which the carbene is bonded to a metal that bears an electron-withdrawing group (usually
a carbonyl). In such cases the carbenoid carbon is mildly electrophilic.
• Schrock carbenes, in which the carbene is bonded to a metal that bears an electron-donating group. In such
cases the carbenoid carbon is nucleophilic and resembles Wittig reagent (which are not considered carbene derivatives).
B) Reactions (16 hrs)
- Fundamental steps in Organometallic Chemistry (6 hrs, distributed equally: substitution, associative and dissociative
mechanism)