• 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)
  • Stereoselective
  • To combat this problem, Yamamoto and coworkers developed an efficient stereoselective and regioselective route to alkenes using a combination of ketone phenylaziridinylhydrazones as arenesulfonylhydrazone equivalents with a catalytic amount of lithium amides. (wikipedia.org)
  • 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)
  • allylic
  • Pd-catalyzed allylic C-H trifluoroacetoxylation of substituted alkenes was performed using PhI(OCOCF3)(2) as the oxidant and acyloxy source. (diva-portal.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
  • The words alkene and olefin are often used interchangeably (see nomenclature section below). (wikipedia.org)
  • 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)
  • class
  • By dissimilar is meant falling outside the definition of the class of a-mono-alkenes described herein. (google.com)
  • The systematic name of this enzyme class is alkene,NADH:oxygen oxidoreductase. (wikipedia.org)
  • water
  • The reduction of alkenes has been achieved using NaBH4 as the reducing agent using 0.5-1.0 mol % Ru(PPh3)4H2 in the presence of water. (bath.ac.uk)
  • Halohydrins are usually prepared by treatment of an alkene with a halogen, in the presence of water. (wikipedia.org)
  • useful
  • Alkenes are very useful to us in our daily lives, and they appear much more than you think. (hubpages.com)
  • You can turn large chain alkenes that are not very useful into smaller chain alkenes that can be used to make plastic or be used as a fuel. (hubpages.com)
  • Alkene dihydroxylation by osmium tetroxide is an old and extremely useful method for the functionalization of olefins. (wikipedia.org)
  • addition
  • Hydroamination is the addition of an N-H bond of an amine across a carbon-carbon multiple bond of an alkene, alkyne, diene, or allene. (wikipedia.org)