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If  no  is chosen, stereo bonds are not allowed between two chiral centers.  For example: 

Br

OH

Cl

CH

3

Yes 

(2R,3R) 3 bromo 3 chloro 2 methylpropan 1 ol 

No 

Refused to name 

Note 

Avoid drawing stereo bonds represented as H C

3

CH

3

 or H C

3

CH

3

, 

where the direction of the stereo bond is not explicitly shown.  Such bonds will be 

replaced by a usual stereo bond, e.g., H C

3

CH

3

 or H C

3

CH

3

, 

H C

3

CH

3

 or H C

3

CH

3

, and named correspondingly. 

4.12.3.3  Name Preferred Tautomeric Form 

This option allows you to choose between two possible procedures for tautomeric analysis. 

If Yes is selected, the name for preferred tautomeric form of the drawn structure will be 

generated. 

If No is selected, the name for the drawn tautomeric form of the structure will be generated. 

For example: 

Yes 

acetamide acetamide 

No 

acetamide ethanimidic 

acid 

4.12.4 Custom Tab 

The fourth set of preferences deals with refusals and utilization of natural product names. 

4.12.4.1  Fused Multiparent Systems 

Although ACD/Name can handle a broad variety of compounds, improvements to the algorithm 

are ongoing.  For some compounds, the current name is not the most preferable IUPAC name.  

The Refuse to Name preference group allows one to specify what naming should be skipped. 

For example: 

N

O

N

IUPAC name: 

furo[1,2 b:3,4 b']dipyridine 

Index name: 

pyrido[2 ,3 :4,5]furo[2,3 b]pyridine 

ACD/I Lab via ChemSketch  

User's Guide 

37