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Technical data


Cannizzaro reaction and reaction of benzaldehyde with ethylene glycol

Article no: P3101600

Principle

In the first part of the experiment, benzaldehyde disproportionates under the effect of alkalis to alcohol-soluble benzyl alcohol and water-soluble benzoic acid that precipitates when the aqueous solution is acidified. In the second part, benzaldehyde reacts with ethylene glycol to form a cyclic acetal. This ethylene acetal is resistant against basic and oxidising reagents. In an acid medium, it once again splits up into its original products. It is because of these characteristics that cyclic acetals are used for blocking the carbonyl function in preparative, organic chemistry.

Benefits

  • Experiment including Abbe refractometer
  • Controlled and safe heating via heating mantle and power regulator
  • Secure connection of the items by GL screw joint system

Tasks

  1. Show the Cannizzaro reaction of benzaldehyde under basic conditions. 
  2. Prepare benzaldehyde ethylene acetal from benzaldehyde with ethylene glycol.

Learning objectives

  • Cannizzaro reaction
  • Benzaldehyde
  • Acetals
  • Distillation
  • Micro distillation

Necessary accessories

  • Precision balance 620g/0.001g

 

Scope of delivery

Support base DEMO 02007-55 1
Stand rods, stainless steel, various sizes 02037-00 2
Right angle boss-head clamp 37697-00 3
Universal clamp 37715-01 3
Support ring, i.d. 70mm, 37721-01 1
Test tube rack, wood, for 6 tubes d= 30 mm 40569-10 1
Test tube, Duran®, various lengths 36304-01 2
Round-bottom flask, 250 ml, GL 25 MAU-27220002 2
Water separator GL25/12 35790-15 1
Dimroth-Condensor, GL 25/12 MAU-27223500 1
Short distillation head, GL 18/8 MAU-27224500 1
Adapter for 4 flasks, GL25 MAU-27227500 1
Round bottom flask, 100ml, GL 25/12 MAU-27100001 1
Round-bottom flask, 50 ml MAU-27220001 4
Lab thermometer,-10..+250C 38065-00 2
Secure bottle, 500 ml, 2 x Gl 18/8, 1 x 25/12 34170-01 1
Spring manometer, 0...-1000 mbar 34170-02 1
Glass tubes, right-angled, 150 x 80 mm MAU-10022500 1
Stopcock,3-way,t-shaped, glass 36731-00 1
Water jet pump, plastic 02728-00 1
Heating mantle f. roundbottom flask, 100 ml 49541-93 1
Heating mantle f. roundbottom flask, 250ml 49542-93 1
Clamp for heating mantle 49557-01 2
Power regulator 32288-93 1
Graduated cylinders, Boro, various sizes 36627-00 1
Beakers, Boro, high form, various sizes 46032-00 1
Separatory funnel 250 ml pear-sh. 36884-00 1
Erlenmeyer flasks, Boro, wide neck, various sizes 46152-00 1
Funnels (glass), Boro, various sizes 34459-00 1
Pleated filter, various sizes 47580-05 1
Abbe refractometer 35912-00 1
Immersion thermostat Alpha A, 230 V 08493-93 1
External circulation set for thermostat Alpha A 08493-02 1
Bath for thermostat, makrolon 08487-02 1
Weighing dishes, square shape, 84 x 84 x 24 mm, 500 pcs. 45019-50 1
Hose clip, diam. 8-16 mm, 1 pc. 40996-02 2
Rubber hose, various diameters 39282-00 6
Rubber hose for vacuum, various diameters 39286-00 2
Spoon, special steel 33398-00 1
Wash bottle, plastic, 500 ml 33931-00 1
Glass rod,boro 3.3,l=300mm, d=7mm 40485-05 1
Pasteur pipettes, 250 pcs 36590-00 1
Rubber caps, 10 pcs 39275-03 1
Boiling beads, 200 g 36937-20 1
Benzaldehyde 500 ml 30036-50 1
Ethyl alcohol, absolute 500 ml 30008-50 1
Ethylene glycol 250 ml 30085-25 1
Toluene 250 ml 30236-25 1
Ortho-phosphoric acid 85% 250 ml 30190-25 1
Hydrochloric acid 37 %, 1000 ml 30214-70 1
Potassium carbonate,98-100% 250 g 30096-25 1
Potassium hydroxide pellets,500 g 30103-50 1
Water, distilled 5 l 31246-81 1
Tubing connector, ID 6-10mm 47516-01 2

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Robert-Bosch-Breite 10 – 37079 Göttingen – Germany
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