Bert.Kilanowski

Welcome to Wikidata, Bert.Kilanowski!

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Best regards! Liuxinyu970226 (talk) 08:25, 2 January 2016 (UTC)

Group of stereoisomers

Please do not merge items that have instance of (P31)group of stereoisomers (Q59199015) and instance of (P31)chemical compound (Q11173), i.e. Brilliant Black BN (Q420079) and tetrasodium 4-acetamido-5-hydroxy-6-[(E)-{7-sulfonato-4-[(E)-(4-sulfonatophenyl)diazenyl]-1-naphthyl}diazenyl]-1,7-naphthalenedisulfonate (Q75123017) as these two items describe two different concepts (which is clearly visible given e.g. different InChIs). More at Wikidata:WikiProject Chemistry/Guidelines. Wostr (talk) 20:27, 20 November 2021 (UTC)

Wostr, I merged the two items as there was a conflict shown for the CAS number of the two items, as they were using both the same CAS number, which would mean that they are identical. Regards --Bert (talk) 10:53, 21 November 2021 (UTC)

It happens quite often that CAS number is assigned incorrectly. Just check the InChI and InChIKey, CAS number is a rather outdated way of identifying compounds. This CAS number seems to match neither Brilliant Black BN (Q420079) nor tetrasodium 4-acetamido-5-hydroxy-6-[(E)-{7-sulfonato-4-[(E)-(4-sulfonatophenyl)diazenyl]-1-naphthyl}diazenyl]-1,7-naphthalenedisulfonate (Q75123017) given the information provided by CAS Commons Chemistry. Wostr (talk) 12:36, 21 November 2021 (UTC)

A few comments about your recent edits

Hi,

• 2,2-dimethylhexane (Q2813766):

  [1] – type of chemical entity (Q113145171) is now a correct metaclass for every chemical compound, in a few weeks all remaining instance of (P31)chemical compound (Q11173) will be either moved to subclass of (P279) (if there is no other chemical class added to an item) or deleted (if there are other classes present which are subclasses of chemical compound (Q11173)).

  [2] – octane (Q58623289) was a correct class here as octane (Q150681) describes other chemical entity, a linear alkane, while 2,2-dimethylhexane (Q2813766) is its constitutional isomer.

Regards, Wostr (talk) 16:28, 5 August 2023 (UTC)

@Wostr: I changed the class as there is an error message for the identifier FL number. There it's stated that the class of 2,2-dimethylhexane (Q2813766) should not be 'type of chemical entity (Q113145171)' but 'chemical compound (Q11173)' or {{Q|Q15711994}'. If you think 'type of chemical entity (Q113145171)' is correct, you need to update this restriction in FL-Number regards Bert (talk) 16:44, 5 August 2023 (UTC)