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  Encyclopedia of Keywords > Nature > Chemistry > Reagent   Michael Charnine

Keywords and Sections
ALDEHYDE
WITTIG REAGENT
REAGENTS
REACTION
LIMITING REAGENT
YIELD
ORGANIC
ADD
WEIGHT
REAGENT
EQUATION
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.

Definitions

  1. Reagent: A common partner of the reactant in many chemical reactions.

Aldehyde

  1. The Corey-Chaykovsky reagent is a sulfonium ylide which converts aldehydes to epoxides.
  2. This reagent will convert aldehydes to carboxylic acids without attacking carbon-carbon double-bonds.
  3. Methoxymethylenetriphenylphosphine is a Wittig reagent for the homologation of aldehydes.

Wittig Reagent

  1. However the Wittig reagent can tolerate many other variants.
  2. The second Wittig reaction uses a non-stabilised Wittig reagent, and as expected this gives mainly the cis product.
  3. The Wittig reagent is usually prepared from a phosphonium salt, which is in turn made by the reaction of triphenylphosphine with an alkyl halide.
  4. Compared with the Wittig reagent, it has more functional group tolerance.

Reagents

  1. The Gilman reagent is an effective nucleophile for 1,4-additions to conjugated carbonyls.
  2. Now when a reagent (e.g., HCN) is added to the carbonyl compound, a complete polarisation of pye electrons takes place.
  3. A hypothesis might be that a precipitate will always occur from methanol at a certain minimal concentration of a certain reagent.
  4. Chemical Reagent Calculator is a usefull tool to assist laboratory staff in preparing Molar, Anydrous & percentage solutions.

Reaction

  1. An "electrophilic substitution reaction " is a heterolytic reaction in which the reagent supplying the entering group acts as an electrophile.
  2. Remember that catalysts, solvents, or any compounds that are not part of the actual chemical reaction cannot be the limiting reagent.
  3. 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.
  4. 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.

Limiting Reagent

  1. Well you need to calculate the limiting reagent.
  2. Therefore, NaI runs out first: it is the limiting reagent.
  3. I am sure you are familiar with finding the limiting reagent.
  4. The chemical with less mols than the proportion requires will be the limiting reagent.
  5. In the case above, the hydrogen gas was the limiting reagent.

Yield

  1. The overall yield of product depends on the limiting reagent.
  2. The theoretical yield is based on the moles of limiting reagent you started with.
  3. In this example, there is only one reactant (CH 3) 3 COH, so this is the limiting reagent (remember HCl is a catalyst).
  4. Reactants not completely used up are called excess reagent, and the reactant completely reacts is called limiting reagent.

Organic

  1. Another approach to organic reactions is by type of organic reagent, many of them inorganic, required in a specific transformation.
  2. TFA is a reagent used frequently in organic synthesis due to its nature as an organic-soluble strong acid.

Add

  1. Cool in dry ice-acetone bath and cautiously add ammonium chloride-ice water mix to decompose the excess Grignard reagent.
  2. Alternatively, evaporate the petroleum ether, add 2 ml Duquenois reagent ( 12 drops acetaldehyde, 1 g vanillin, 50 ml ethanol), 2 ml HCl and stir.

Weight

  1. A Molal solution is one gram molecular weight of the reagent in 1 kilogram of solvent, and is usually represented by "m".
  2. For acetic acid, you find in the table the MW, normality of concentrated reagent, the percent by weight, and the specific gravity.

Reagent

  1. For example, the Grignard reagent, RMgX (where X equals Br, Cl, or I), and organolithium compounds react with ketones to give secondary alcohols.
  2. Analysts assume that 1 ml of 1N reagent will react with 1 ml of 1N reagent.
  3. Hint . . . AgNO3 is the excess reagent.
  4. It is important for the reaction, but isn-t a reagent so it doesn-t figure into the yield calculation.
  5. Thus, Grignard reagent formation from an alkyl halide reduces the substituted carbon atom.

Equation

  1. Look at the number of moles of limiting reagent and look at the balanced equation.

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  Originally created: May 07, 2008.
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