Experiment 8:. BROMINATION OF STILBENE: A GREEN SYNTHESIS. Objectives. To perform a Green Chemistry synthesis and determine chemical yield. To purify and isolate the product by recrystallization and vacuum filtration. To determine the degree of product purity using TLC analysis.
BROMINATION OF STILBENE:
A GREEN SYNTHESIS
p electrons form bond to d+ bromine atom…
… to form bromonium ion intermediate.
… d- bromine atom forms bond to carbon on opposite side of bromonium ion…
… to result in trans addition product.
Apply standard solutions and sample solution to plate.
Develop TLC plate in chamber.
Visualize plate using UV lamp!
Calculate TLC Rf value for each spot.
If all of the stilbene has reacted, there will be no evidence of it in the product lane. This indicates a successful reaction!Experimental Procedure(TLC Analysis)
2 slices of bread
1 slice of cheese
mL 1.0 g 81 g 2 mol HBr dibromostilbene