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Benzyl Benzoate: Benzaldehyde and Sodium Benzylate
Benzyl benzoate is an oily ester that dissolves PVC when hot and softens it. Kamm (Organic Syntheses, 1921): a little sodium dissolved in benzyl alcohol turns two molecules of benzaldehyde into one of benzyl benzoate. Keep it below 50 to 60 °C as it mixes, or it overheats into benzyl ether. 454 g of benzaldehyde give 410 to 420 g. Sodium metal burns in water: keep it dry.
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Ilọsíwájú
1 day
Ìlànà
1
1
Dissolve the sodium in benzyl alcohol
Dissolve the sodium in benzyl alcohol
Goggles and gloves on. Warm 3 g of sodium in 70 g of pure benzyl alcohol for half an hour until it dissolves. Let it cool to room temperature.
Àwọn irinṣẹ́ tí a nílò:
Sódíọ̀mù
Ọtí Benzyl
Ìgò abẹ́-róbótó
Ìkòkò ńlá (ti ìsàlẹ̀, fún ìwẹ̀ omi)
Òǹwọ̀n ìdọ́gba
Ìbọ̀wọ́ rọ́bà
Gílásì Ààbò Fún Ìfọ́n Kẹ́míkà2
2
Add it to the benzaldehyde, cool
Add it to the benzaldehyde, cool
Add the solution little by little to 454 g of benzaldehyde, mixing well. Cool if needed to keep it just below 50 to 60 °C. It sets to a pasty jelly.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Benzaldehyde454 gÀwọn irinṣẹ́ tí a nílò:
Ìgò abẹ́-róbótó
Ẹ̀rọ Ìwọ̀n OoruÌkòkò ńlá (ti ìsàlẹ̀, fún ìwẹ̀ omi)3
3
Warm on the water bath
Warm on the water bath
When the temperature stops rising, after about half an hour, warm it on the water bath for one to two hours, shaking now and then.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ńlá (ti ìsàlẹ̀, fún ìwẹ̀ omi)Ìgò abẹ́-róbótó4
4
Wash
Wash
Cool, add 200 ml of water and separate the oil. Wash it once more with water.
Àwọn irinṣẹ́ tí a nílò:
Omi
Fóńnù ìyàsọ́tọ̀5
5
Distil under vacuum
Distil under vacuum
Distil under vacuum. Benzyl alcohol, leftover aldehyde and water come first. When the temperature jumps, change the receiver: benzyl benzoate boils at 184 to 185 °C at 15 mm. Expect 410 to 420 g.
Àwọn irinṣẹ́ tí a nílò:
Ìgò Gíláàsì Ìsàn
Ìyípo ẹ̀rọ ìtutù
Ẹ̀rọ ìfàfẹ́fẹ́jádeẸ̀rọ Ìwọ̀n Ooru
Àwọn ìgò dígí pẹ̀lú ìdéríÀwọn ohun-èlò
1- 454 gÀyè
Àwọn irinṣẹ́ tó nílò
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