Definition of double bond in English:

double bond

noun

  • A chemical bond in which two pairs of electrons are shared between two atoms.

    ‘This is in contrast with most electrophilic additions to carboncarbon double bonds, and with nucleophilic substitutions at saturated carbon atoms.’
    • ‘The benzene molecule is a six-carbon ring with alternating single and double bonds between the carbon atoms.’
    • ‘Organic sulfates are esters and are formed by reacting an alcohol with cold sulfuric acid or by the reaction of sulfuric acid with a double bond in an alkene.’
    • ‘On activation, the silane double bonds react with the polymer matrix to create a highly crosslinked, load spreading structure.’
    • ‘Fatty acids that contain double bonds between carbon atoms in their chain are termed unsaturated fatty acids.’
    • ‘Like other hydrocarbons with double bonds, addition reactions can occur to change the double bonds to single bonds.’
    • ‘Conversely, unsaturated fatty acids have one or more double bonds between carbon atoms in their chains.’
    • ‘Oxidation of an aldehyde breaks the double bond within the carbonyl group to give a carboxylic acid.’
    • ‘Researchers have begun to exploit conjugated polymers - repeating chains of organic molecules rich in double bonds between carbon atoms - in hopes of creating LEDs that can be molded like plastic and tuned easily from one color to another.’
    • ‘This free radical attacks the double bonds on other monomers creating a longer chain molecule and an additional free radical.’
    • ‘In the nitro group, the central nitrogen atom is involved in both a double bond and a single bond.’
    • ‘They are typified by benzene, which contains six carbon atoms and three double bonds.’
    • ‘The porphyrin ring is unsaturated, having alternating carbon-carbon single bonds and double bonds throughout the ring.’
    • ‘Fading occurs when any chemical process breaks the sequence of conjugated double bonds constituting the chromophore - the dye moiety that imparts colour.’
    • ‘Alkyl halides are produced by adding hydrogen halides across the double bonds.’
    • ‘Ozone is a strong electrophilic reagent which can attack the double bond found in alkenes.’
    • ‘A double bond happens when two electrons are shared or exchanged in a bond.’
    • ‘The central carbon atom has a double bond with the oxygen.’
    • ‘The naming of geometrical isomers reflects the position of the atoms or groups on each of the carbon atoms in the double bond.’
    • ‘The difference between the two structures is the location of the double bond relative to the single bond.’

Pronunciation

double bond

/ˈdəbəl bänd/ /ˈdəbəl bɑnd/