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Date: 6-9-2019
508
Date: 15-10-2020
1513
Date: 20-10-2020
1477
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A characteristic reaction of aldehydes without α
hydrogens is the self oxidation-reduction they undergo in the presence of strong base. With methanal as an example,
If the aldehyde has α
hydrogens, other reactions usually occur more rapidly.
The mechanism of this reaction, usually called the Cannizzaro reaction,4
combines many features of other processes studied in this chapter. The first step is reversible addition of hydroxide ion to the carbonyl group:
A hydrogen can be transferred as hydride ion to methanal from the hydroxyalkoxide ion, thereby reducing the methanal to methanol:
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هل يمكن للدماغ البشري التنبؤ بالمستقبل أثناء النوم؟
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علماء: طول الأيام على الأرض يزداد بسبب النواة الداخلية
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أجواء صلاة عيد الأضحى المبارك من العتبة العسكرية المقدسة
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