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Cannizzaro reaction and reaction of benzaldehyde with ethylene glycol

Cannizzaro reaction and reaction of benzaldehyde with ethylene glycol

Item no.: P3101600

Difficulty Expenditure of Time print
  • Description
  • Scope of Supply
  • Accessories
  • Downloads and Documents

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.

What you can learn about

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

Necessary accessories

  • Precision balance 620g/0.001g

 

Device Name Item no. Qty
Erlenmeyer flask, borosilicate, wide neck, 250 ml 46152-00 1,00
Round-bottom flask, 50 ml MAU-27220001 1,00
Холодильник Димрота MAU-27223500 1,00
Potassium hydroxide pellets,50 30103-50 1,00
Glass rod,boro 3.3,l=300mm, d=7mm 40485-05 1,00
Bath for thermostat, makrolon 08487-02 1,00
Right angle boss-head clamp 37697-00 3,00
Test tube,200x30 mm 36304-01 2,00
Water separator GL25/12 35790-15 1,00
Support rod, stainless steel, l = 600 mm, d = 10 mm 02037-00 2,00
Water, distilled 5 l 31246-81 1,00
Benzaldehyde 500 30036-50 1,00
Rubber caps, 10 pcs 39275-03 1,00
Stopcock,3-way,t-shaped, glass 36731-00 1,00
Secure bottle, 500 ml, 2 x Gl 18/8, 1 x 25/12 34170-01 1,00
Heating mantle f. roundbottom flask, 250ml 49542-93 1,00
Ortho-phosphoric acid 85% 250 30190-25 1,00
Test tube rack, wood, for 6 tubes d= 30 mm 40569-10 1,00
External circulation set for thermostat Alpha A 08493-02 1,00
Universal clamp 37715-00 3,00
Pasteur pipettes, 250 pcs 36590-00 1,00
Water jet pump, plastic 02728-00 1,00
Power regulator 32288-93 1,00
Ethylene glycol 250 30085-25 1,00
Rubber tubing, i.d. 6 mm 39282-00 6,00
Separatory funnel 250 ml pear-sh. 36884-00 1,00
Abbe refractometer 35912-00 1,00
Spring manometer, 0...-1000 mbar 34170-02 1,00
Clamp for heating mantle 49557-01 2,00
Hydrochloric acid 37 %, 1000 30214-70 1,00
Hose clip, diam. 8-16 mm, 1 pc. 40996-02 2,00
Immersion thermostat Alpha A, 230 V 08493-93 1,00
Support ring, i.d. 70mm, 37721-01 1,00
Graduated cylinder, borosilicate, 25 ml 36627-00 1,00
Spoon, special steel 33398-00 1,00
folded filter,qual.,185 mm,100pcs 47580-05 1,00
Potassium carbonate,98-100% 25 30096-25 1,00
Rubber tubing,vacuum,i.d.6mm 39286-00 2,00
Boiling beads, 200 g 36937-20 1,00
Beaker, DURAN®, tall form, 150 ml 36003-00 1,00
Funnel, glass, top dia. 80 mm 34459-00 1,00
Support base DEMO 02007-55 1,00
Toluene 250 30236-25 1,00
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1,00
Ethyl alcohol, absolute 500 30008-50 1,00
Lab thermometer,-10..+250C 38065-00 2,00
Glass tubes, right-angled, 10 36701-57 1,00
Round bottom flask, 100ml, GL 25/12 35841-15 1,00
Wash bottle, plastic, 500 ml 33931-00 1,00
Heating mantle f. roundbottom flask, 100 ml 49541-93 1,00
Tubing connector, ID 6-10mm 47516-01 2,00

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