benzo[rst]pentaphene

English translation: positions of substitution

21:09 Nov 29, 2015
English language (monolingual) [PRO]
Tech/Engineering - Chemistry; Chem Sci/Eng / Material Safety Data
English term or phrase: benzo[rst]pentaphene
Dear all,
Would you please help me understand the meaning of the letters in square brackets "[rst]" above? They appear in a Safety Data Sheet. There are many of them, for example:
Dibenz(a,i)pyrene
Anthra[9,1,2-cde]benzo[rst]pentaphene

Many thanks in advance!
Ali Al awadi
Romania
Local time: 06:57
Selected answer:positions of substitution
Explanation:
The letters denote the bonds where another benzene ring is substituted.
The carbon atoms in the organic compound are numbered, but the bonds between them are denoted with letters. See http://iupac.org/publications/pac/11/1/0001/pdf/
on page 3
Selected response from:

Sabine Akabayov, PhD
Israel
Local time: 06:57
Grading comment
Many thanks!
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
5 +3positions of substitution
Sabine Akabayov, PhD


  

Answers


1 hr   confidence: Answerer confidence 5/5 peer agreement (net): +3
rst
positions of substitution


Explanation:
The letters denote the bonds where another benzene ring is substituted.
The carbon atoms in the organic compound are numbered, but the bonds between them are denoted with letters. See http://iupac.org/publications/pac/11/1/0001/pdf/
on page 3

Sabine Akabayov, PhD
Israel
Local time: 06:57
Specializes in field
Native speaker of: Native in GermanGerman
PRO pts in category: 8
Grading comment
Many thanks!

Peer comments on this answer (and responses from the answerer)
agree  Darmali
4 hrs

agree  Charles Davis: Yes: such letters or numbers in square brackets are locants.
10 hrs

agree  Sabina Králová
2 days 21 hrs
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