Missing elements of Grignard reagent reactions

In summary, the homework question asks to find the product of two reactions: the first involving butanal and bromobenzene in acid, and the second involving bromophenylmagnesium and cyclohexylethyne in diethyl ether. However, there seems to be some discrepancies in the given information, as the first reaction is missing a key component (a magnesium atom) and the second reaction involves an unsuitable reagent (a primary alkyne). It is recommended to review a list of suitable reagents for this type of reaction for a proper answer.
  • #1
Greywolfe1982
62
0

Homework Statement



Find the product of each reaction

Homework Equations



Butanal (http://www.chemspider.com/Chemical-Structure.256.html?rid=e530204e-5d67-41a8-88e9-fc8e0ffcf41b), reacted first with bromobenzene (http://www.chemspider.com/Chemical-Structure.7673.html?rid=9d9b30cd-5d16-4f10-a320-9b2a445fef1f) then in acid (H3O+)

Bromophenylmagnesium (http://www.chemspider.com/Chemical-Structure.10254417.html) with cyclohexylethyne (http://www.chemspider.com/Chemical-Structure.63448.html) in diethyl ether

The Attempt at a Solution



I'm really not sure where either go, as neither of them seem to be a standard Grignard reagent reaction. The first is missing an Mg between the carbon group and the halogen, and the second is missing both a carbonyl (C=O) and acidic conditions. Are there alternatives to the standard reaction?
 
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  • #2
There's no way for any of us to answer this question. We don't know how the question was worded or if you were assigned to find flaws.

In the first case you are missing a magnesium as you've indicated. In the second case you are given a primary alkyne as a reagent. Review your list of suitable/unsuitable reagents for this type of reaction for your answer.
 

1. What is a Grignard reagent?

A Grignard reagent is a type of organometallic compound that contains a carbon-metal bond, typically made from an alkyl or aryl halide and a magnesium metal. It is commonly used in organic synthesis reactions due to its high reactivity and ability to form carbon-carbon bonds.

2. How do I know if a Grignard reagent reaction is missing an element?

If a Grignard reagent reaction is missing an element, it may not proceed as expected and can result in a low yield or no reaction at all. Signs of a missing element include a lack of color change, low reactivity, or the presence of unreacted starting materials.

3. What are some common missing elements in Grignard reagent reactions?

The most common missing elements in Grignard reagent reactions are moisture, oxygen, and acidic impurities. These can interfere with the formation of the Grignard reagent or react with the reagent before it can participate in the desired reaction.

4. How can I prevent missing elements in my Grignard reagent reactions?

To prevent missing elements in Grignard reagent reactions, it is important to use dry solvents and reagents, handle the reaction under inert conditions, and avoid exposure to air. Additionally, it is helpful to carefully monitor the reaction and troubleshoot any unexpected results.

5. What are the potential consequences of missing elements in Grignard reagent reactions?

The consequences of missing elements in Grignard reagent reactions can range from a decrease in yield or reaction rate to complete failure of the reaction. Additionally, the presence of impurities or side reactions can result in the formation of undesired products or the destruction of the Grignard reagent, making it unusable for further reactions.

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