hydroboration and hydrocyanation of olefin 3.ppt
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Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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- 1. 1
- 2. Hydroboration and Hydrocyanation of Olefins Dr Tahir Mahmood Associate Professor of Chemistry
- 3. 3 Hydroboration Hydroboration reaction was introduced by H. C. Brown in 1959. Hydroboration is syn addition of borane reagent H-BR2 to alkenes.
- 6. 6 Metal- Catalysed hydroboration: Männing and Nörth introduced metal catalyzed hydroboration reaction in 1985. The complex RhCl(PPh3)3(also known as Wilkinson’s catalyst) became the first highly active catalyst for hydrobortion Wilkinson’s catalyst
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- 8. 8
- 9. 9 Synthetic applications of Hydroboration
- 10. 10 Hydrocyanation is the process in which HCN is added across a double bond of an alkene to form a nitrile Hydrocyanation This reaction may be used to synthesize nitriles from alkenes or alkynes in a Markovnikov or anti-Markovnikov fashion.
- 11. 11 Catalysed Hydrocyanation is of two types Nickel-catalyzed hydrocyanation Copper-catalyzed hydrocyanation
- 13. 13 At elevated temperature terminal alkenes may be hydrocyanated by Ni complex in the presence of a Lewis acid and provide anti-markovnikov addition selectively.
- 14. 14 Catalyst decomposition Deactivation can take place if the intermediate hydride or alkyl species react with HCN .
- 15. 15 Hydrocyanation of 1,3 Butadiene DuPont has commercialised the addition of HCN to butadiene for the production of adiponitrile [ADN, NC(CH2)4CN], a precursor to 6,6-nylon.
- 16. 16 Isomerization of 2M3BN to 3PN
- 17. 17 Copper-catalyzed hydrocyanation Copper is a good catalyst for hydrocyanation reaction of alkenes as compared to nickel complex.. Copper catalysis appears to be a very convenient and efficient method for realizing the monohydrocyanation of butadiene, as the yields are good and the reaction leads selectively to substituted 2-butenes. 95%
- 18. 18 Synthetic Applications of Nitriles
- 19. 19