Illustrated Glossary of Organic Chemistry

Fused: (1) Two or more rings that share an edge (i.e., the share two bonded atoms).


Naphthalene is a fused bicyclic aromatic molecule. The shared atoms and bond that cause the molecule to be fused are shown in red.


Bicyclo[2.2.1]heptane is a bridged bicyclic molecule.


Spiro[2.3]hexane is a spiro bicyclic molecule.

(2) A substance that has been melted, then allowed to solidify.


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Silica

Boron trioxide

Soda ash

Lime

A Pyrex glass beaker
Borosilicate (Pyrex) glass used in most laboratory glassware is manufactured by fusing silica (SiO2; essentially highly purified sand), boron trioxide (B2O3), soda ash (sodium carbonate; Na2CO3), and lime (calcium oxide; CaO) at high temperature, then allowing this melt to cool and solidify.