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Bromination of Stilbene.  

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October 20, 2003 OCN- 1202 Bromination of Stilbene Abstract: Trans-stilbene and elemental bromine reacts to form a white crystalline solid, 1,2-dibromo-1,2-diphenylethane. The crystalline solid is collected by vacuum filtration and through melting point analysis, the product is determined as the meso stereo isomer. Techniques Used: Electronic Analytical Balance Melting Point Analysis (no new techniques) Procedure: Trans-stilbene (0.8094g) is dissolved with approximately 6 mL of dichloromethane in a 25mL Erlenmeyer flask. Approximately 0.7mL of Br2 solution is placed into the flask and the contents become an orange-brown bromine color. The experimenter then swirled the flask continuously for 3 minutes and the orange-brown color began to fade. As the color faded, white crystalline solid precipitated. Another ~0.7mL of Br2 solution is added to the flask and the contents in the flask became orange/brown. The flask is swirled for another 3 minutes and the orange-brown color faded once again and more white crystalline crystals precipitated. For the third time, ~0.7mL...

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