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Bond Type<br />

Description<br />

Finds:<br />

Does not find:<br />

OH<br />

Cl<br />

Triple<br />

target must have triple bond<br />

here<br />

HN<br />

O<br />

O<br />

NH 2<br />

Substituents<br />

In E-Notebook, a substituent is defined as a nonhydrogen<br />

atom connected by a bond of any order.<br />

For example, a carbonyl oxygen is a substituent of<br />

the carbonyl carbon.<br />

All unfilled valences in the query may be filled by<br />

hydrogen atoms or by non-hydrogen substituents.<br />

The normal valence of an atom is determined from<br />

data in the periodic table. For example, carbon has<br />

a valence of 4, while sulfur has valences of 2, 4, and<br />

6. Any explicit charges, radicals, or query properties<br />

modify the normal valence. For example, a<br />

carbocation has a valence of 3.<br />

Hydrogen atoms in the query may match nonhydrogen<br />

substituents in the target if the hydrogen<br />

in the query is implicit on an unlabeled carbon atom<br />

or heteroatom.<br />

Hydrogen atoms in the query must match<br />

hydrogens in the target when the query hydrogen is<br />

at the end of an explicit bond. The matched<br />

hydrogen in the target may be implicit in an<br />

unlabeled carbon.<br />

Query<br />

H<br />

H<br />

O<br />

N<br />

H<br />

H<br />

Charges and Radicals<br />

Charges or radicals specified on atoms in the query<br />

must match those in the target. The valence of a<br />

charged atom is taken to be the valence of the<br />

isoelectronic neutral atom With a Substructure<br />

Search:<br />

Query :<br />

Finds<br />

Br<br />

Br<br />

OH<br />

N<br />

NH 3<br />

H 2<br />

N<br />

NH 2<br />

N<br />

O<br />

H<br />

H<br />

Does not find:<br />

OH<br />

NH 2<br />

NH<br />

N<br />

OH<br />

E-Notebook<br />

N<br />

N<br />

OH<br />

<strong>ChemOffice</strong> 2005/E-Notebook Searching • 459<br />

Chemical Structure Search

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