Bridges
A bridge is an unbranched chain of atoms or an atom or a covalent bond connecting two bridgeheads in a polycyclic compound.
The main bridge is a bridge that connects the two main bridgeheads.
A secondary bridge is any bridge not included in the main ring or the main bridge.
An independent secondary bridge links bridgeheads that are part of the main ring or main bridge.
A dependent secondary bridge links at least one bridgehead that is part of a secondary bridge.
Read more about this topic: Bicyclic Molecule
Famous quotes containing the word bridges:
“There is nothing in machinery, there is nothing in embankments and railways and iron bridges and engineering devices to oblige them to be ugly. Ugliness is the measure of imperfection.”
—H.G. (Herbert George)
“If the Revolution has the right to destroy bridges and art monuments whenever necessary, it will stop still less from laying its hand on any tendency in art which, no matter how great its achievement in form, threatens to disintegrate the revolutionary environment or to arouse the internal forces of the Revolution, that is, the proletariat, the peasantry and the intelligentsia, to a hostile opposition to one another. Our standard is, clearly, political, imperative and intolerant.”
—Leon Trotsky (1879–1940)
“to-morrow it seem
Like the empty words of a dream
Remembered on waking.”
—Robert Bridges (1844–1930)