Essay on Preparation of 2,4 Dinitrodiphenylamine

716 Words Apr 2nd, 2013 3 Pages
Experiment 3
Preparation of 2, 4-Dinitrodiphenylamine
Courtney Elahee
Claim: The evidence will show that the red solid collected after recrystallization from the nucleophilic aromatic substitution of 2, 4-dinitrobromobenzene and aniline has the characteristics of 2, 4-dinitrodiphenylamine.
Evidence: The procedure was carried out as described by Ault1 and the lab manual2. 2,4-dinitrobromobenzene (0.92g, 3.75mmol, pale yellow solid) and aniline (0.7mL, 0.7g, 7.5 mmol) were boiled in ethanol (10mL) under reflux until all solid dissolved. After the mixture cooled to room temperature, short, red needles were collected by suction filtration. The product was then recrystallized in the presence of 95% ethanol producing long red needles.
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TLC separates molecules according to their affinity to the TLC surface. If the sample is polar and the eluent is nonpolar, then the sample will not travel up the plate with the eluent. This occurs because there will be greater intermolecular forces between the adsorbent and the sample than the forces between the eluent and sample. There were three eluents that were used to determine which eluent had the best separation: hexane (nonpolar), toluene

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