• pyramidal alkene
  • In truth, the misalignment of the p orbitals is less than expected because pyramidalization takes place (See: pyramidal alkene). (wikipedia.org)
  • In one study, isolation of a pyramidal alkene is not even possible by matrix isolation at extremely low temperatures unless stabilized by metal coordination: A reaction of the diiodide 5.1 in Figure 5 with sodium amalgam in the presence of ethylenebis(triphenylphosphine)platinum(0) does not give the intermediate alkene 5.2 but the platinum stabilized 5.3. (wikipedia.org)
  • substrates
  • Alkene substrates with a tethered nitrogen nucleophile have been used in these transformations to promote intramolecular aminocyclization. (wikipedia.org)
  • In enzymology, an alkene monooxygenase (EC 1.14.13.69) is an enzyme that catalyzes the chemical reaction propene + NADH + H+ + O2 ⇌ {\displaystyle \rightleftharpoons } 1,2-epoxypropane + NAD+ + H2O The 4 substrates of this enzyme are propene, NADH, H+, and O2, whereas its 3 products are 1,2-epoxypropane, NAD+, and H2O. (wikipedia.org)
  • This approach has achieved exquisite diastereocontrol on a number of alkene substrates. (springer.com)
  • ligand
  • Most famously, the alkene ligand undergoes migratory insertion, wherein it is attacked intramolecularly by alkyl and hydride ligands to form new alkyl complexes. (wikipedia.org)
  • The four main categories are (1) nucleophilic attack on an alkene alkyne, or allyl ligand and (2) insertion of the alkene into the metal-amide bond. (wikipedia.org)
  • Sharpless asymmetric dihydroxylation (also called the Sharpless bishydroxylation) is the chemical reaction of an alkene with osmium tetroxide in the presence of a chiral quinine ligand to form a vicinal diol. (wikipedia.org)
  • polymerization
  • Relatively long-chain normal monol-alkenes, i.e., those having at least 5 carbon atoms, are generally characterized as possessing slow addition polymerization rates. (google.com)
  • As stated above, the polymerization method of the present invention is particularly useful for forming copolymers of the normal mono-l-alkene with dissimilar, olefinica'llyunsaturated monomers which may exhibit faster addition polymerization rates than the comparatively slow polymerizing alpha-olefins. (google.com)
  • monomers
  • Alkenes form monomers and then join together to form polymers to make plastic. (hubpages.com)
  • The present invention relates to a method of polymerizing normal mono-l-alkenes of to about 25 carbon atoms, especially with one or more dissimilar ethylenically-unsaturated monomers. (google.com)
  • aqueous
  • NBS will react with alkenes 1 in aqueous solvents to give bromohydrins 2. (wikipedia.org)
  • The preferred conditions are the portionwise addition of NBS to a solution of the alkene in 50% aqueous DMSO, DME, THF, or tert-butanol at 0 °C. Formation of a bromonium ion and immediate attack by water gives strong Markovnikov addition and anti stereochemical selectivities. (wikipedia.org)
  • In oxymercuration, the alkene reacts with mercuric acetate (AcO-Hg-OAc) in aqueous solution to yield the addition of an acetoxymercury (HgOAc) group and a hydroxy (OH) group across the double bond. (wikipedia.org)
  • oxidation
  • Early metals of low oxidation state (Ti(II), Zr(II), Nb(III) etc.) are strong pi donors, and their alkene complexes are often described as metallacyclopropanes. (wikipedia.org)
  • transition metals
  • Fe(C8H8)2, a complex of cyclooctatetraene The bonding between alkenes and transition metals is described by the Dewar-Chatt-Duncanson model, which involves donation of electrons in the pi-orbital on the alkene to empty orbitals on the metal. (wikipedia.org)
  • Lewis
  • Late metals (Ir(I), Pt(II)), which are poorer pi-donors, tend to engage the alkene as a Lewis acid-Lewis base interaction. (wikipedia.org)
  • fine-chemicals
  • Controlling the isomerization of alkenes is important for the manufacturing of fuel additives, fine-chemicals and pharmaceuticals. (uva.nl)
  • strain
  • In cycloheptene (1.1) the cis isomer is an ordinary unstrained molecule, but the heptane ring is too small to accommodate a trans-configured alkene group resulting in strain and twisting of the double bond. (wikipedia.org)
  • Alkene monooxygenase from Xanthobacter strain Py2. (wikipedia.org)
  • below
  • Treatment of the phenylaziridinylhydrazone with 0.3 equivalents of LDA in ether resulted in the alkene shown below with a cis:trans ratio of 99.4:0.6. (wikipedia.org)
  • group
  • Until all hydrogens attached to boron have been transferred away, the boron group BH2 will continue adding to more alkenes. (wikipedia.org)
  • room
  • A new method for the syn -dichlorination of alkenes at room temperature has been proposed by Denmark et al. (springer.com)