Lab report 2 (no name)

Lab report 2 (no name) - CHEMISTRY 29B PRELAB WRITEUP AND...

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CHEMISTRY 29B PRELAB WRITEUP AND EXPERIMNETAL REPORT SHEET Name: Lab partner name: T.A’S name: Date: 2/6/08 Experiment #: 2 Title: Formation of aromatic Tropylium ion via formation of flouroborate salt Purpose: We will form the tropylium ion by reacting flouborate salt (obtained from the reaction of triphenymethanol and flouboric acid) and cycloheptatriene. We will form tropylium iodide and isolate triphenylmethane to confirm. Preliminary write-up: Materials and Products Name Composition Amount (used or produced) Mol Mass (g/mole) Melting Point ( ° C) Boiling Point ( ° C) Density (g/mL) Acetic anhydride C 4 H 6 O 3 1.75 mL 102.10 -73.1 139.8 1.08 Flouboric acid HBF 4 88 mg 87.83 -90.0 130.0 1.18 Triphenylmethanol (Ph) 3 COH 195 mg 260.34 163.0 380.0 1.20 Cycloheptatriene C 7 H 8 78 mg 92.14 -80.0 117.0 Insoluble Anhydrous ether C 4 H 10 O 10 ml 74.12 -116.3 34.6 0.71 3 M Sodium hydroxide NaOH 10 ml 39.99 318.0 1390.0 2.1 Triphenylmethane (Ph) 3 CH 10 mg 244.34 94.0 359.0 1.01 Tropylium ion C 7 H 7 10 mg 40.10 - - - 1 10x100-mm reaction tube; 1 analytical scale; 1 spatula; 1 stirring rod; 1 ice water bath; 1 hot water bath; 1 graduated cylinder; 5 pipettes; 1 Hirsch funnel; 1 filtration apparatus; 1 melting point apparatus; 2 melting point capillaries H 3 C C O C CH 3 O O Acetic anhydride B F F F F H Flouboric acid C OH Triphenylmethanol CH Triphenylmethane H H Cycloheptatriene O Anhydrous ether Na OH Sodium hydroxide Tropilium ion Equations: HBF 4 + Ph 3 C-OH Ph 3 C H BF 4 + H 2 O 2HOAc C 7 H 8 + Ph 3 C H BF 4 C 7 H 7 H BF 4 + Ph 3 CH C 7 H 7 H BF 4 + NaI C 7 H 7 H H H + NaBF 4 C 7 H 7 H H H + AgNO 3 C 7 H 7 H H NO 3 + AgI Theoretical yield : (80 mg Cycloheptatriene) x (1 g/1000 mg) x (1 mol CyH/92.14 g) x (1 mol Tropylium/1 mol CyH) x (40.10 g/1 mol trop) x (1000 mg/1 g) = 34.73 g Tropylium Percent yield: (Exp. weight/ Theor. weight) x 100; (55.2 g Tropylium formed /34.73 g expected) x 100 = 158.9 % Experimental procedures 1. Add 1.75 ml acetic anhydride and 88 mg flouboric
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This note was uploaded on 04/07/2008 for the course CHEM 29B taught by Professor Cziplack during the Spring '08 term at Brandeis.

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Lab report 2 (no name) - CHEMISTRY 29B PRELAB WRITEUP AND...

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