Diels-Alder reaction

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Diels-Alder reaction

(ˈdiːlzˈɔːldə)
n
(Chemistry) chem a type of chemical reaction in which one organic compound containing conjugated double bonds adds to another containing an ethylenic bond to form a product containing a ring
[C20: named after Otto Diels (1876–1954) and Kurt Alder (1902–58), German chemists]
References in periodicals archive ?
The process comprises reacting a halobutyl polymer with at least one nitrogen and/or phosphorous based nucleophile to provide a halobutyl ionomer comprising conjugated diene units; grafting of an amine-reactive dienophile to said ionomer to form a functionalized ionomer; and optionally blending the resulting functionalized ionomer with polyamide.
Most adducts are generated by the reaction between a diene (a properly substituted furan) and a dienophile (an imide or an anhydride) and these functionalities can be end chains or pendant groups of the polymer main chains [6, 9].
3,5- Dibromoindene-1-one (6) underwent an intramolecular [2+4] cycloaddition reaction in which cyclopentadienone structure acted as both diene and dienophile.
1998), however, this depends on the substituents on the frame of the thiophene-S-oxide and also on the nature of the dienophile present in these reactions (Fujii et al.
As a result, hydrogen bond formation between the cation and the carbonyl of the dienophile would stabilize the LUMO energy of the acceptor, thus increasing the selectivity for formation of the endo product.
Of the various Lewis acids and ligands screened, a combination of Yb(OTf)3 and diphenyl Pybox ligand gave the best selectivity (25:75 endo:exo) while using a dienophile derived from a pyrazolidinone.
The thermally reversible polymer typically includes at least one furan diene unit and at least one amine maleimide dienophile.
The synthesis begins with a Diels-Alder reaction between heterodiene 10 and vinyl ether 3 as the dienophile (Equation 2).
In the first step of the synthesis, a molecule containing two pairs of double-bonded carbon atoms--a diene--reacts with another molecule, a dienophile, which readily combines with the diene to form a ring of carbon atoms.
The subject invention further reveals a rubbery composition which is comprised of the reaction product of (I) a rubbery polymer having repeat units which are comprised of (1) an olefin monomer selected from the group consisting of conjugated diolefin monomers and monoolefm monomers and (2) a conjugated triene monomer and (II) a dieno phile and/or dienophile which is functionalized with a group which is capable of reacting with a filler selected from the group consisting of carbon black, silica, starch, and cellulose.