Abstract
The search for mild, user-friendly, easily accessible, and robust organometallic reagents
is an important feature of organometallic chemistry. Ideally, new methodologies employing
organometallics should be developed with respect to practical applications in syntheses
of target compounds. In this short review, we investigate if organozirconium reagents
can fulfill these criteria. Organozirconium compounds are typically generated via
in situ hydrozirconation of alkenes or alkynes with the Schwartz reagent. Alkyl and
alkenylzirconium reagents have proven to be convenient in conjugate additions, allylic
substitutions, cross-coupling reactions, and additions to carbonyls or imines. Furthermore,
the Schwartz reagent itself is a useful reducing agent for polar functional groups.
1 Introduction
2 Synthesis and Generation of the Schwartz Reagent
3 Structure and Properties of Cp2 Zr(H)Cl
4 Reactivity of Organozirconium Reagents
4.1 Asymmetric Conjugate Addition
4.2 Asymmetric Allylic Alkylations
4.3 Desymmetrization Reactions
4.4 Cross-Coupling Reactions
4.5 1,2-Additions
5 Conclusions
Key words zirconium - Schwartz reagent - hydrometallation - organozirconium reagents