<P> A concentrated solution of ammonium cyanide, refluxed for few days, yields adenine, a component of DNA . This provides a clue about origin of life on earth . </P> <Table> <Tr> <Td> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Toluene is refluxed with sodium &ndash benzophenone desiccant before it is distilled to give pure oxygen - and water - free toluene . </Td> </Tr> </Table> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Industrial fractionating columns all of which use reflux </Td> </Tr> </Table> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Organic synthesis apparatus using reflux </Td> </Tr> </Table> </Td> </Tr> </Table> <Tr> <Td> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Toluene is refluxed with sodium &ndash benzophenone desiccant before it is distilled to give pure oxygen - and water - free toluene . </Td> </Tr> </Table> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Industrial fractionating columns all of which use reflux </Td> </Tr> </Table> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Organic synthesis apparatus using reflux </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Toluene is refluxed with sodium &ndash benzophenone desiccant before it is distilled to give pure oxygen - and water - free toluene . </Td> </Tr> </Table>

The purpose of carrying out a reflux is to