Just like C=C double bonds, C≡C triple bonds have a special type of reactivity associated with them, so it’s useful to call a C≡C triple bond a functional group. Alkynes are linear so we Alkynes contain C≡C triple bonds Just like C=C double bonds, C≡C triple bonds have a special type of reactivity associated with them, so it’s useful to call a C≡C triple bond a functional group. Alkynes are linear so we draw them with four carbon atoms in a straight line. Alkynes are not as widespread in nature as alkenes, but one fascinating class of compounds containing C≡C triple bonds is a group of antitumour agents discovered during the 1980s. Calicheamicin is a member of this group. The high reactivity of this combination of functional groups enables calicheam icing to attack DNA and prevent cancer cells from proliferating. For the fi rst time we have drawn a molecule in three dimensions, with two bonds crossing one another—can you see the shape?

مواضيع ذات صلة

Chemical reactions

Rotation and rigidity

The carbonyl group

We can hybridize any atoms

Hybridization of atomic orbitals

Molecular orbitals of molecules with more than two atoms

Other factors affecting degree of orbital interaction

Bonds between different atoms

Forming bonds using 2s and 2p atomic orbitals: σ and π orbitals

Bond order

Why hydrogen is diatomic but helium is not

Breaking bonds