Review of Short Phrases and Links|
This Review contains major "Reagent"- related terms, short phrases and links grouped together in the form of Encyclopedia article.
- Reagent: A common partner of the reactant in many chemical reactions.
- The Corey-Chaykovsky reagent is a sulfonium ylide which converts aldehydes to epoxides.
- This reagent will convert aldehydes to carboxylic acids without attacking carbon-carbon double-bonds.
- Methoxymethylenetriphenylphosphine is a Wittig reagent for the homologation of aldehydes.
- However the Wittig reagent can tolerate many other variants.
- The second Wittig reaction uses a non-stabilised Wittig reagent, and as expected this gives mainly the cis product.
- The Wittig reagent is usually prepared from a phosphonium salt, which is in turn made by the reaction of triphenylphosphine with an alkyl halide.
- Compared with the Wittig reagent, it has more functional group tolerance.
- The Gilman reagent is an effective nucleophile for 1,4-additions to conjugated carbonyls.
- Now when a reagent (e.g., HCN) is added to the carbonyl compound, a complete polarisation of pye electrons takes place.
- A hypothesis might be that a precipitate will always occur from methanol at a certain minimal concentration of a certain reagent.
- Chemical Reagent Calculator is a usefull tool to assist laboratory staff in preparing Molar, Anydrous & percentage solutions.
- An "electrophilic substitution reaction " is a heterolytic reaction in which the reagent supplying the entering group acts as an electrophile.
- Remember that catalysts, solvents, or any compounds that are not part of the actual chemical reaction cannot be the limiting reagent.
- Control of stereoselectivity of a reaction by steric hindrance towards attack of the reagent, which is directed to the less hindered face of the molecule.
- At this stage the retained dimer structures are reacted only with reagent Y to give nine final products, three in each of the reaction vessels.
- Well you need to calculate the limiting reagent.
- Therefore, NaI runs out first: it is the limiting reagent.
- I am sure you are familiar with finding the limiting reagent.
- The chemical with less mols than the proportion requires will be the limiting reagent.
- In the case above, the hydrogen gas was the limiting reagent.
- The overall yield of product depends on the limiting reagent.
- The theoretical yield is based on the moles of limiting reagent you started with.
- In this example, there is only one reactant (CH 3) 3 COH, so this is the limiting reagent (remember HCl is a catalyst).
- Reactants not completely used up are called excess reagent, and the reactant completely reacts is called limiting reagent.
- Another approach to organic reactions is by type of organic reagent, many of them inorganic, required in a specific transformation.
- TFA is a reagent used frequently in organic synthesis due to its nature as an organic-soluble strong acid.
- Cool in dry ice-acetone bath and cautiously add ammonium chloride-ice water mix to decompose the excess Grignard reagent.
- Alternatively, evaporate the petroleum ether, add 2 ml Duquenois reagent ( 12 drops acetaldehyde, 1 g vanillin, 50 ml ethanol), 2 ml HCl and stir.
- A Molal solution is one gram molecular weight of the reagent in 1 kilogram of solvent, and is usually represented by "m".
- For acetic acid, you find in the table the MW, normality of concentrated reagent, the percent by weight, and the specific gravity.
- For example, the Grignard reagent, RMgX (where X equals Br, Cl, or I), and organolithium compounds react with ketones to give secondary alcohols.
- Analysts assume that 1 ml of 1N reagent will react with 1 ml of 1N reagent.
- Hint . . . AgNO3 is the excess reagent.
- It is important for the reaction, but isn-t a reagent so it doesn-t figure into the yield calculation.
- Thus, Grignard reagent formation from an alkyl halide reduces the substituted carbon atom.
- Look at the number of moles of limiting reagent and look at the balanced equation.
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