What are the reaction characteristics of aluminum isopropoxide? (Need to combine with reaction examples)
Aluminum isopropoxide is a highly selective aldehyde and ketone reductant. It transfers a hydride ion to aldehydes or ketones, while undergoing oxidation itself. As the reaction progresses, the ketone is distilled out, driving the reaction towards the product. Excess is added during the reaction
The newly formed aluminum alkoxide can exchange with isopropanol to regenerate aluminum isopropoxide, which is then used for reduction. Therefore, only a catalytic amount of aluminum isopropoxide is required to complete the reaction.
The advantage of this reaction is that it is particularly smooth when reducing unsaturated carbonyl compounds, without affecting C=C, -NO2, and -COOR.
The main applications of the product are as a medical intermediate and in organic catalytic reactions.
Regarding the preservation of aluminum isopropoxide
1. What will aluminum isopropoxide turn into if it is exposed to air for a long time? After being placed in an open container for one month, I found that the agglomerated AIP blocks in the bottle crumble easily upon touch. Is it possible for it to turn into aluminum hydroxide?
Answer: Aluminum isopropoxide will inevitably undergo some hydrolysis when left exposed to air for extended periods, resulting in the formation of aluminum hydroxide and isopropanol.
2. Can aluminum isopropoxide undergo alcoholysis when vigorously stirred in ethanol at 75 degrees Celsius? (It produces a milk-like liquid, and white small particles appear after standing still.) Or will it only dissolve in ethanol?
Answer: Aluminum isopropoxide is soluble in ethanol, but a better reaction temperature is above 80 degrees Celsius. Only at this temperature or higher can stable substances be obtained during the aging process.
3. Does the hydrolysis of aluminum isopropoxide directly produce aluminum hydroxide?
Answer: The hydrolysis of aluminum isopropoxide does not produce aluminum hydroxide, but rather ALOOH.