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4.12.2.3  New Functional Groups Names 

This allows the user to specify the usage of suffixes and prefixes based on either A Guide to 

Nomenclature of Organic Compounds (Recommendations 1993) or Nomenclature of 

Organic Chemistry, 1979 ed. (Blue book).  For example:  

H C

S

3

O

HS

OH

Yes 

2 (methylsulfanyl) 3 sulfanylpropanoic acid 

No 

3 mercapto 2 (methylthio)propanoic acid 

4.12.3 Structure Tab 

The third set of preferences to be decided upon is the Structure.  It specifies the preferred stereo 

conventions which will be used in name generation. 

Note 

In order for the stereochemistry of a chiral center of a sketched in molecule to be 

decided, the active centers must be designated with stereo bonds. 

4.12.3.1 Ignore Stereochemistry 

Specifies whether to ignore configuration of carbon centers and carbon carbon double bonds or 

to take them into account and attribute corresponding stereodescriptors.  In the last case an 

asymmetric site will have its stereochemistry explicitly denoted in its name.  

For example: 

CH

3

H C

3

CH

3

H C

3

OH

Yes 

2 butene 2 butanol 

No 

(2Z) 2 butene (2R) 2 butanol 

4.12.3.2  Stereo Wedge Direction 

This allows you to choose between two possible procedures of stereo bond analysis.  

If yes is chosen, the  up  and  down  wedges which specify stereo centers will be analyzed with 

regard to their directions (depending on which atom a narrow end is attached).  

If no is chosen, the sign ( up  or  down ) of the stereo wedge doesn't depend on the direction. 

For example: 

Cl

Cl

H C

3

H C

3

CH

3

CH

3

Yes 

(2R) 2 chlorobutane (2S) 2 chlorobutane 

No 

(2R) 2 chlorobutane (2R) 2 chlorobutane 

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