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Markovnikov Hydroboration of Perfluoroalkylethylenes
Herbert C Brown1, Guang-Ming Chen1, Michael P Jennings1
1H. C. Brown and R. B. Wetherill Laboratories of Chemistry, Purdue University, West Lafayette, IN 47907-1393 (USA), Fax: (+1) 765-494-0239.
Hydroboration of perfluoroalkylethylenes with borane reagents achieves high Markovnikov regioselectivity. This reaction efficiently yields valuable (fluoroalkyl)dihaloboranes for further chemical synthesis.
Area of Science:
- Organic Chemistry
- Organoboron Chemistry
Background:
- Hydroboration is a key reaction in organic synthesis for adding boron and hydrogen across a double bond.
- Perfluoroalkylated organic compounds possess unique electronic properties and find applications in various fields.
- Controlling regioselectivity in the hydroboration of electron-deficient alkenes remains a synthetic challenge.
Purpose of the Study:
- To investigate the hydroboration of perfluoroalkylethylenes and pentafluorostyrene.
- To achieve high regioselectivity in the addition of borane reagents to these fluorinated alkenes.
- To synthesize novel (fluoroalkyl)dihaloboranes.
Main Methods:
- Reaction of perfluoroalkylethylenes and 2',3',4',5',6'-pentafluorostyrene with dichloro- and dibromoborane.
- Analysis of reaction products to determine regioselectivity and yield.
- Characterization of the resulting (fluoroalkyl)dihaloboranes.
Main Results:
- Achieved Markovnikov regioselectivity of 92% or higher in the hydroboration reactions.
- Successfully synthesized a series of (fluoroalkyl)dihaloboranes.
- Demonstrated the utility of dichloro- and dibromoborane as effective reagents for this transformation.
Conclusions:
- The hydroboration of perfluoroalkylethylenes and pentafluorostyrene with dichloro- and dibromoborane proceeds with excellent Markovnikov regioselectivity.
- This methodology provides a reliable route to valuable (fluoroalkyl)dihaloborane intermediates.
- The findings expand the synthetic utility of organoboron compounds in fluorinated systems.
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