Experiment16 - 16 THE PREPARATION AND REACTIONS OF BENZOIN...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
16. THE PREPARATION AND REACTIONS OF BENZOIN PRE-LABORATORY WORK In your laboratory notebook write down the following: the experiment title and the date the experiment will be carried out a brief statement of the experiment to be performed a brief plan of the experimental procedure In addition answer the following questions: 1. In PART B , addition of 6 M HCl leads to foaming – gas evolution. What is the gas produced? Where does it originate? 2. NaBH 4 reduces ketones via addition of what nucleophile? 3. Could you use 13 C NMR to deduce the structure of dioxolane C? If so, what would you be looking for? 4. What is the molarity of concentrated hydrochloric acid? How would you prepare 6 M HCl? 5. A key aspect in terms of the mechanism is “are the two ring oxygen atoms in dioxolane C derived from the ketone, or are they both derived from the diol”? 67
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6. A solution must be saturated before a compound will begin to crystallize. How can you use solvent mixtures and temperature to increase recrystallization efficiency? If you recrystallize 1 g of a pure compound, would you expect to re- isolate 1 g? Why not? Name (Please print) Bench Number Date Signature Demonstrator's Signature CAREFULLY TEAR THIS SHEET FROM YOUR LABORATORY MANUAL AND HAND IT IN WITH YOUR COMPLETED REPORT 68
Background image of page 2
16. THE PREPARATION AND REACTIONS OF BENZOIN SAFETY DATA Benzaldehyde IRRITANT, TOXIC Dichloromethane IRRITANT, TOXIC Dispose of residues in chlorinated solvents bottle. Ethanol FLAMMABLE, TOXIC Dispose of residues in non- chlorinated solvents bottle. Hydrochloric acid (12 M, bench conc. HCl) CORROSIVE Wash spillages away with plenty of water. Petrol (petroleum ether) (b.p. 40-60 ° C and b.p. 60-80 ° C) HIGHLY FLAMMABLE TOXIC; ALL FLAMES IN THE VICINITY MUST BE EXTINGUISHED. Dispose of residues in non- chlorinated solvents bottle. Potassium carbonate solution (10%) CORROSIVE Wash spillages away with plenty of water. Sodium borohydride CORROSIVE, FLAMMABLE Wash spillages away with plenty of water. Triethylamine FLAMMABLE LIQUID, CORROSIVE, STENCH Use in fume cupboard. Wash Glassware in fume cupboard. INTRODUCTION
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/23/2010 for the course CHEM CHEM2220 taught by Professor Andreana during the Fall '10 term at Wayne State University.

Page1 / 7

Experiment16 - 16 THE PREPARATION AND REACTIONS OF BENZOIN...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online