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BiX3-Mediated Hydrohalogenations of HDDA Benzynes: An Approach to Polycyclic Aryl Halides
Siddique Khan1, Beeraiah Baire1
1Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India.
This study introduces a new method for synthesizing complex aryl halides using hydrohalogenation reactions of benzynes. Bismuth(III) halides facilitate this process, with regioselectivity controlled by substrate substituents.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Halogenation Reactions
Background:
- Benzynes are highly reactive intermediates crucial in organic synthesis.
- Aryl halides are versatile building blocks in pharmaceuticals and materials science.
- Efficient methods for generating complex aryl halides are in demand.
Purpose of the Study:
- To develop a novel hydrohalogenation method for benzynes.
- To explore the utility of bismuth(III) halides in promoting these reactions.
- To understand the factors governing regioselectivity in benzyne hydrohalogenation.
Main Methods:
- Hydrohalogenation of internal alkynes to form benzynes.
- Catalysis using bismuth(III) halides (BiX3).
- Analysis of regiochemical outcomes based on substrate structure.
Main Results:
- Demonstrated successful hydrohalogenation of benzynes using bismuth(III) halides.
- Showcased that all three bismuth(III) halides (BiCl3, BiBr3, BiI3) can serve as halide sources.
- Established that regioselectivity is dictated by the substituent at the diyne terminus, independent of the linker or bismuth reagent.
- Confirmed a broad substrate scope for various tethers and substituents.
Conclusions:
- Bismuth(III) halides effectively promote benzyne hydrohalogenation, yielding complex aryl halides.
- The regiochemical outcome is predictable and controllable via substrate modification.
- This method offers a versatile route to diverse aryl halide structures.
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