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Substituents: Free Sites<br />

The Substituents: Free Sites property specifies the<br />

maximum number of additional substituents that<br />

may be present on an atom. This property is only<br />

meaningful in a substructure search.<br />

NOTE: Specifying Free Sites: 0 is a quick way to indicate<br />

that you want no further substitution at a site. Target<br />

structures will match the query structure as drawn, with no<br />

additional ligands.<br />

With a substructure search, the query:<br />

finds any of:<br />

Cl<br />

∗2<br />

This atom is marked<br />

with the atom property<br />

Substituents Free Sites:2<br />

does NOT find any of:<br />

This property is only meaningful in a substructure<br />

search.<br />

NOTE: This atom property does not affect the display of<br />

implicit hydrogens, only their presence in a search. For more<br />

information about displaying implicit hydrogens, see<br />

“Setting Preferences” on page 341.<br />

Unsaturation<br />

Sometimes it is useful to specify that an atom must<br />

or must not be attached to unsaturated (aromatic,<br />

double, or triple) bonds. ChemFinder allows<br />

searches for atoms whose unsaturation Must Be<br />

Absent (all bonds to the atom are single). It also<br />

allows searches for atoms with at least one multiple<br />

(double, triple, or aromatic) bond. The default<br />

value, Undefined, finds targets without regard to<br />

the hybridization of the atom.<br />

This property is only meaningful in a substructure<br />

search.<br />

With a substructure search, the query:<br />

HO<br />

O<br />

This atom is marked<br />

with the atom property<br />

Unsaturation: must be present<br />

S<br />

O<br />

OH<br />

O<br />

O<br />

finds any of:<br />

does NOT find any of:<br />

Implicit Hydrogens<br />

This atom property may have either of two values:<br />

Allowed (default) or Not Allowed. If implicit<br />

hydrogens are Not Allowed, the atom must be fully<br />

substituted in the target.<br />

Appendices<br />

<strong>ChemOffice</strong> 2005/Appendix Structural Query Features • 683<br />

Atom Properties

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