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The beauty of grignard reagents is their relative ease of production, in simple terms just take an alkyl halide add magnesium and stir to get RMgX which can then be reacted further.
The difficulty in using calcium is that the metal itself is less reactive and calcium organometallics are relativelly unstable. Calcium organohalides are also more salt-like and are not as soluble as their Mg counterpart.
This whole area is not that well understood, the mechanism of production of grignards is unclear. Certainly alkylcalcium halides are known but they are difficult to prepare and are described as extremely unrreactive.
If you have access to a library then see:-
Volume 252, Issues 15-17, August 2008, Pages 1516-1531
Recent Advances in Organometallic Chemistry: 2008
Review
Heavy Grignard reagents-Synthesis and reactivity of organocalcium compounds by Matthias Westerhausen
What else can I help you with?
Why Grignard reagent cannot be prepared by Calcium instead of Magnissium?
The beauty of grignard reagents is their relative ease of production, in simple terms just take an alkyl halide add magnesium and stir to get RMgX which can then be reacted further. The difficulty in using calcium is that the metal itself is less reactive and calcium organometallics are relativelly unstable. Calcium organohalides are also more salt-like and are not as soluble as their Mg counterpart. This whole area is not that well understood, the mechanism of production of grignards is unclear. Certainly alkylcalcium halides are known but they are difficult to prepare and are described as extremely unrreactive.
How can you make a tertiary alcohol from a grignard reagent?
you react the grignard with either an ester, an acid chloride or a ketone to get a tertiary alchohol. if you react a grignard reagent with an aldehyde you get a secondary alcohol and if you react the grignard with formaldehyde (methenal) you get a primary alchohol. same thing happens if u use R-Li instead of a grignard reagant.
What is the impurity formed during the preparation of the Grignard reagent if phenyl bromide was used instead of bromobenzene?
If phenyl bromide is used instead of bromobenzene in the preparation of a Grignard reagent, the impurity formed is phenylmagnesium bromide (PhMgBr). This impurity can be problematic because it reacts differently than the desired Grignard reagent and can lead to undesired side reactions. This impurity can be removed through careful purification techniques before further use in reactions.
Does mixing sodium hydroxide and calcium nitrate form a precipitate?
Mixing sodium hydroxide and calcium nitrate will not form a precipitate. Instead, it will form solutions of sodium nitrate and calcium hydroxide.
Is calcium carbonate and water a suspension or a solution?
The solubility of calcium carbonate in water is very low; so calcium carbonate form a suspension.
Why Grignard reagent cannot be prepared by Calcium instead of Magnissium?
The beauty of grignard reagents is their relative ease of production, in simple terms just take an alkyl halide add magnesium and stir to get RMgX which can then be reacted further. The difficulty in using calcium is that the metal itself is less reactive and calcium organometallics are relativelly unstable. Calcium organohalides are also more salt-like and are not as soluble as their Mg counterpart. This whole area is not that well understood, the mechanism of production of grignards is unclear. Certainly alkylcalcium halides are known but they are difficult to prepare and are described as extremely unrreactive.
How can you make a tertiary alcohol from a grignard reagent?
you react the grignard with either an ester, an acid chloride or a ketone to get a tertiary alchohol. if you react a grignard reagent with an aldehyde you get a secondary alcohol and if you react the grignard with formaldehyde (methenal) you get a primary alchohol. same thing happens if u use R-Li instead of a grignard reagant.
What is the impurity formed during the preparation of the Grignard reagent if phenyl bromide was used instead of bromobenzene?
If phenyl bromide is used instead of bromobenzene in the preparation of a Grignard reagent, the impurity formed is phenylmagnesium bromide (PhMgBr). This impurity can be problematic because it reacts differently than the desired Grignard reagent and can lead to undesired side reactions. This impurity can be removed through careful purification techniques before further use in reactions.
Why is a hot water bath used in grignard reagent production?
It helps to speed up the process. Instead of waiting around a lot longer, you can use the bath to hurry up the process.
Does mixing sodium hydroxide and calcium nitrate form a precipitate?
Mixing sodium hydroxide and calcium nitrate will not form a precipitate. Instead, it will form solutions of sodium nitrate and calcium hydroxide.
Is dinosaur leg bone containing quartz instead of calcium fossils?
yes
Is calcium carbonate and water a suspension or a solution?
The solubility of calcium carbonate in water is very low; so calcium carbonate form a suspension.
Is it correct to ask what did you prepared in the breakfast?
No. You could say 'what have you prepared for breakfast' or 'what did you prepare for breakfast' instead.
What type of fossil is a dinosaur leg bone containing quartz instead of calcium?
It is a trace fossil.
Why has RDAs for calcium not been set but instead it has AI levels set?
Sometimes breakfast is unhealthy
When blood calcium levels fall what doesn't occur?
When blood calcium levels fall, the body does not increase the secretion of calcitonin, a hormone that lowers blood calcium levels. Instead, the parathyroid hormone (PTH) is released, which works to raise calcium levels by stimulating the release of calcium from bones, increasing calcium reabsorption in the kidneys, and enhancing the absorption of calcium in the intestines. Therefore, calcitonin's role is not activated during low calcium levels.
What does calcium form when it freezes?
Calcium is solid at room temperature, so it is already "frozen" under normal conditions. In its pure form calcium is a silvery-gray metal.
