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ChemOffice.Com - CambridgeSoft

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Administrator<br />

Bond Type<br />

Wavy<br />

specifies stereochemistry<br />

“either” at both ends<br />

Hollow Wedged same as Wedged<br />

Dative<br />

Description<br />

same as Single<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 atom.<br />

H<br />

O<br />

Double<br />

target must have double bond;<br />

stereo dictated by geometry<br />

H<br />

N<br />

finds any of: does NOT find any of:<br />

OH<br />

Double Either<br />

target must have double bond;<br />

any stereochemistry ok<br />

HN<br />

O<br />

Cl<br />

O<br />

NH 2<br />

Double Bold<br />

same as Double<br />

H<br />

Br<br />

OH<br />

O<br />

OH<br />

Triple<br />

target must have triple bond<br />

here<br />

H<br />

Br<br />

N<br />

NH 2<br />

H<br />

H<br />

OH<br />

NH 2<br />

Substituents<br />

In ChemFinder, 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 window. For example,<br />

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

of 2, 4, and 6. Any explicit charges, radicals, or<br />

query properties modify the normal valence. For<br />

example, a 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 />

Charges and Radicals<br />

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

must match those in the target. Uncharged atoms in<br />

the query may or may not match charged atoms in<br />

the target, depending on the state of the appropriate<br />

check box in the Search tab of the Preferences<br />

dialog.<br />

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

valence of the isoelectronic neutral atom.<br />

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

N +<br />

678• Structural Query Features <strong>CambridgeSoft</strong><br />

General Properties

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