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Reaction Mechanisms. Presented by Leticia Bonita Prince Newcastle University 4 th Year MChem Student. Aims of Today. Increase your understanding of reaction mechanisms and the bromination of alkenes. Increase your spatial skills and awareness using software designed by the CCDC.

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reaction mechanisms

Reaction Mechanisms

Presented by Leticia Bonita Prince

Newcastle University 4th Year MChem Student

aims of today
Aims of Today
  • Increase your understanding of reaction mechanisms and the bromination of alkenes
  • Increase your spatial skills and awareness using software designed by the CCDC
what are spatial skills
What are Spatial Skills?
  • The ability to mentally manipulate 2-dimensional and 3-dimensional figures.
  • Important in chemistry, biology, medicine, mathematics, physics and everyday life.
curly arrows
Curly Arrows
  • In a chemical reaction NEW BONDS ARE MADE and BONDS ARE BROKEN. A reaction mechanism illustrates how this happens.
  • Curly Arrows are used to highlight the MOVEMENT OF ELECTRONS.

H+ + Cl-

2Cl.

A HALF ARROW REPRESENTS 1 ELECTRON

A FULL ARROW REPRESENTS 2 ELECTRONS

Heterolytic

Fission

Homolytic

Fission

direction of movement
Direction of Movement

NUCLEOPHILE

ELECTROPHILE

nucleophiles
Nucleophiles
  • Electron Pair DONORS
  • Lewis Bases

-CN, -OH, Cl-

electrophiles
Electrophiles
  • Electron Pair ACCEPTOR
  • Lewis Acids

H+, CH3+, NO2+

electrophilic addition to ethene bromination
Electrophilic Addition to Ethene (Bromination)
  • Ethene has a π bond which has high electron density – NUCLEOPHILE
  • Bromine molecule will have a δ+ from Van der Waals’ - ELECTROPHILE
the webcsd
The WebCSD
  • Type in http://webcsd.ccdc.cam.ac.uk/teaching_database_demo.php
  • Answer the questions by typing the refcodes into the “find entry” box
slide13

THANK YOU!

ENJOY THE REST OF YOUR DAY!