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Pyrazolylborate-zinc alkoxide complexes. 3. Acid-base reactions
Horst Brombacher1, Heinrich Vahrenkamp
1Institut für Anorganische und Analytische Chemie der Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany.
Inorganic Chemistry
|September 14, 2004
Summary
Zinc alkoxides react with acidic compounds, facilitating anion exchange and alkoxide exchange. This study details reactions with various acids, including NH and CH acids, expanding organozinc chemistry.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Acid-Base Reactivity
Background:
- Zinc alkoxides are versatile reagents in inorganic and organometallic chemistry.
- Understanding their reactivity with diverse acidic substrates is crucial for synthetic applications.
Purpose of the Study:
- To investigate the acid-base reactions of zinc alkoxides with a range of protic and CH acidic compounds.
- To characterize the products of anion and alkoxide exchange reactions.
Main Methods:
- Reaction of zinc alkoxides (TpPh,MeZn-OR) with various acids.
- Characterization of resulting zinc complexes via anion/alkoxide exchange.
Main Results:
- Anion exchange observed with common acids (e.g., acetic acid, phenol) and NH acids (e.g., cyanamide, lactams).
- Alkoxide exchange demonstrated with alcohols (e.g., methanol, trifluoroethanol).
- Deprotonation of CH acids like acetonitrile and acetone, forming novel zinc-bound organic anions.
Conclusions:
- Zinc alkoxides exhibit broad reactivity towards compounds with acidity higher than parent alcohols.
- The study expands the scope of organozinc chemistry by showcasing diverse deprotonation and exchange reactions.