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4-Bromo-3-methyl-1H-pyrazole

PubChem CID
83741
Structure
4-Bromo-3-methyl-1H-pyrazole_small.png
4-Bromo-3-methyl-1H-pyrazole_3D_Structure.png
Molecular Formula
Synonyms
  • 4-Bromo-3-methylpyrazole
  • 13808-64-5
  • 4-Bromo-3-methyl-1H-pyrazole
  • 4-bromo-5-methyl-1H-pyrazole
  • 3-Methyl-4-bromopyrazole
Molecular Weight
161.00 g/mol
Computed by PubChem 2.2 (PubChem release 2021.10.14)
Dates
  • Create:
    2005-03-26
  • Modify:
    2025-01-25

1 Structures

1.1 2D Structure

Chemical Structure Depiction
4-Bromo-3-methyl-1H-pyrazole.png

1.2 3D Conformer

2 Names and Identifiers

2.1 Computed Descriptors

2.1.1 IUPAC Name

4-bromo-5-methyl-1H-pyrazole
Computed by Lexichem TK 2.7.0 (PubChem release 2021.10.14)

2.1.2 InChI

InChI=1S/C4H5BrN2/c1-3-4(5)2-6-7-3/h2H,1H3,(H,6,7)
Computed by InChI 1.0.6 (PubChem release 2021.10.14)

2.1.3 InChIKey

IXQPRETWBGVNPJ-UHFFFAOYSA-N
Computed by InChI 1.0.6 (PubChem release 2021.10.14)

2.1.4 SMILES

CC1=C(C=NN1)Br
Computed by OEChem 2.3.0 (PubChem release 2024.12.12)

2.2 Molecular Formula

C4H5BrN2
Computed by PubChem 2.2 (PubChem release 2021.10.14)

2.3 Other Identifiers

2.3.1 CAS

2.3.2 European Community (EC) Number

2.3.3 UNII

2.3.4 DSSTox Substance ID

2.3.5 Nikkaji Number

2.3.6 NSC Number

2.3.7 Wikidata

2.4 Synonyms

2.4.1 Depositor-Supplied Synonyms

3 Chemical and Physical Properties

3.1 Computed Properties

Property Name
Molecular Weight
Property Value
161.00 g/mol
Reference
Computed by PubChem 2.2 (PubChem release 2021.10.14)
Property Name
XLogP3-AA
Property Value
1.3
Reference
Computed by XLogP3 3.0 (PubChem release 2021.10.14)
Property Name
Hydrogen Bond Donor Count
Property Value
1
Reference
Computed by Cactvs 3.4.8.18 (PubChem release 2021.10.14)
Property Name
Hydrogen Bond Acceptor Count
Property Value
1
Reference
Computed by Cactvs 3.4.8.18 (PubChem release 2021.10.14)
Property Name
Rotatable Bond Count
Property Value
0
Reference
Computed by Cactvs 3.4.8.18 (PubChem release 2021.10.14)
Property Name
Exact Mass
Property Value
159.96361 Da
Reference
Computed by PubChem 2.2 (PubChem release 2021.10.14)
Property Name
Monoisotopic Mass
Property Value
159.96361 Da
Reference
Computed by PubChem 2.2 (PubChem release 2021.10.14)
Property Name
Topological Polar Surface Area
Property Value
28.7 Ų
Reference
Computed by Cactvs 3.4.8.18 (PubChem release 2021.10.14)
Property Name
Heavy Atom Count
Property Value
7
Reference
Computed by PubChem
Property Name
Formal Charge
Property Value
0
Reference
Computed by PubChem
Property Name
Complexity
Property Value
66.7
Reference
Computed by Cactvs 3.4.8.18 (PubChem release 2021.10.14)
Property Name
Isotope Atom Count
Property Value
0
Reference
Computed by PubChem
Property Name
Defined Atom Stereocenter Count
Property Value
0
Reference
Computed by PubChem
Property Name
Undefined Atom Stereocenter Count
Property Value
0
Reference
Computed by PubChem
Property Name
Defined Bond Stereocenter Count
Property Value
0
Reference
Computed by PubChem
Property Name
Undefined Bond Stereocenter Count
Property Value
0
Reference
Computed by PubChem
Property Name
Covalently-Bonded Unit Count
Property Value
1
Reference
Computed by PubChem
Property Name
Compound Is Canonicalized
Property Value
Yes
Reference
Computed by PubChem (release 2021.10.14)

3.2 Experimental Properties

3.2.1 Dissociation Constants

3.3 SpringerMaterials Properties

4 Spectral Information

4.1 1D NMR Spectra

1D NMR Spectra

4.1.1 1H NMR Spectra

Source of Spectrum
Sigma-Aldrich Co. LLC.
Source of Sample
Sigma-Aldrich Co. LLC.
Catalog Number
278238
Copyright
Copyright © 2021-2024 Sigma-Aldrich Co. LLC. - Database Compilation Copyright © 2021 John Wiley & Sons, Inc. All Rights Reserved.
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4.1.2 13C NMR Spectra

1 of 2
Source of Sample
Aldrich Chemical Company, Inc., Milwaukee, Wisconsin
Copyright
Copyright © 1980, 1981-2024 John Wiley & Sons, Inc. All Rights Reserved.
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2 of 2
Instrument Name
BRUKER WP-80
Copyright
Copyright © 2002-2024 Wiley-VCH Verlag GmbH & Co. KGaA. All Rights Reserved.
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4.2 Mass Spectrometry

4.2.1 GC-MS

1 of 2
NIST Number
267980
Library
Main library
Total Peaks
88
m/z Top Peak
160
m/z 2nd Highest
162
m/z 3rd Highest
81
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2 of 2
Source of Spectrum
AD-0-2532-0
Copyright
Copyright © 2020-2024 John Wiley & Sons, Inc. All Rights Reserved.
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4.3 UV Spectra

4.3.1 UV-VIS Spectra

1 of 2
Copyright
Copyright © 2008-2024 John Wiley & Sons, Inc. All Rights Reserved.
Thumbnail
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2 of 2
Copyright
Copyright © 2008-2024 John Wiley & Sons, Inc. All Rights Reserved.
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4.4 IR Spectra

4.4.1 FTIR Spectra

Technique
KBr WAFER
Source of Sample
Aldrich Chemical Company, Inc., Milwaukee, Wisconsin
Copyright
Copyright © 1980, 1981-2024 John Wiley & Sons, Inc. All Rights Reserved.
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4.4.2 ATR-IR Spectra

1 of 2
Instrument Name
Bio-Rad FTS
Technique
ATR-Neat (DuraSamplIR II)
Source of Spectrum
Forensic Spectral Research
Source of Sample
Sigma-Aldrich Inc.
Catalog Number
28823-8
Lot Number
14519AQ
Copyright
Copyright © 2012-2024 John Wiley & Sons, Inc. All Rights Reserved.
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2 of 2
Source of Sample
Aldrich
Catalog Number
278238
Copyright
Copyright © 2018-2024 Sigma-Aldrich Co. LLC. - Database Compilation Copyright © 2018-2024 John Wiley & Sons, Inc. All Rights Reserved.
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4.4.3 Vapor Phase IR Spectra

1 of 2
Technique
Vapor Phase
Source of Spectrum
Sigma-Aldrich Co. LLC.
Source of Sample
Aldrich
Catalog Number
278238
Copyright
Copyright © 2018-2024 Sigma-Aldrich Co. LLC. - Database Compilation Copyright © 2018-2024 John Wiley & Sons, Inc. All Rights Reserved.
Thumbnail
Thumbnail
2 of 2
Source of Spectrum
Sigma-Aldrich Co. LLC.
Source of Sample
Sigma-Aldrich Co. LLC.
Catalog Number
278238
Copyright
Copyright © 2021-2024 Sigma-Aldrich Co. LLC. - Database Compilation Copyright © 2021 John Wiley & Sons, Inc. All Rights Reserved.
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4.5 Raman Spectra

Technique
FT-Raman
Source of Spectrum
Forensic Spectral Research
Source of Sample
Sigma-Aldrich Inc.
Catalog Number
288238
Lot Number
14519AQ
Copyright
Copyright © 2012-2024 John Wiley & Sons, Inc. All Rights Reserved.
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6 Chemical Vendors

7 Safety and Hazards

7.1 Hazards Identification

7.1.1 GHS Classification

Pictogram(s)
Irritant
Signal
Warning
GHS Hazard Statements

H315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]

H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]

H335 (97.8%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]

Precautionary Statement Codes

P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501

(The corresponding statement to each P-code can be found at the GHS Classification page.)

ECHA C&L Notifications Summary

Aggregated GHS information provided per 46 reports by companies from 6 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown.

7.1.2 Hazard Classes and Categories

Skin Irrit. 2 (100%)

Eye Irrit. 2A (100%)

STOT SE 3 (97.8%)

8 Literature

8.1 Consolidated References

8.2 Springer Nature References

8.3 Thieme References

8.4 Wiley References

8.5 Chemical Co-Occurrences in Literature

9 Patents

9.1 Depositor-Supplied Patent Identifiers

9.2 WIPO PATENTSCOPE

9.3 Chemical Co-Occurrences in Patents

9.4 Chemical-Disease Co-Occurrences in Patents

9.5 Chemical-Gene Co-Occurrences in Patents

10 Biological Test Results

10.1 BioAssay Results

11 Classification

11.1 ChemIDplus

11.2 UN GHS Classification

11.3 NORMAN Suspect List Exchange Classification

11.4 EPA DSSTox Classification

11.5 MolGenie Organic Chemistry Ontology

12 Information Sources

  1. CAS Common Chemistry
    LICENSE
    The data from CAS Common Chemistry is provided under a CC-BY-NC 4.0 license, unless otherwise stated.
    https://creativecommons.org/licenses/by-nc/4.0/
  2. ChemIDplus
    ChemIDplus Chemical Information Classification
    https://pubchem.ncbi.nlm.nih.gov/source/ChemIDplus
  3. DTP/NCI
    LICENSE
    Unless otherwise indicated, all text within NCI products is free of copyright and may be reused without our permission. Credit the National Cancer Institute as the source.
    https://www.cancer.gov/policies/copyright-reuse
  4. EPA DSSTox
    CompTox Chemicals Dashboard Chemical Lists
    https://comptox.epa.gov/dashboard/chemical-lists/
  5. European Chemicals Agency (ECHA)
    LICENSE
    Use of the information, documents and data from the ECHA website is subject to the terms and conditions of this Legal Notice, and subject to other binding limitations provided for under applicable law, the information, documents and data made available on the ECHA website may be reproduced, distributed and/or used, totally or in part, for non-commercial purposes provided that ECHA is acknowledged as the source: "Source: European Chemicals Agency, http://echa.europa.eu/". Such acknowledgement must be included in each copy of the material. ECHA permits and encourages organisations and individuals to create links to the ECHA website under the following cumulative conditions: Links can only be made to webpages that provide a link to the Legal Notice page.
    https://echa.europa.eu/web/guest/legal-notice
  6. FDA Global Substance Registration System (GSRS)
    LICENSE
    Unless otherwise noted, the contents of the FDA website (www.fda.gov), both text and graphics, are not copyrighted. They are in the public domain and may be republished, reprinted and otherwise used freely by anyone without the need to obtain permission from FDA. Credit to the U.S. Food and Drug Administration as the source is appreciated but not required.
    https://www.fda.gov/about-fda/about-website/website-policies#linking
  7. IUPAC Digitized pKa Dataset
  8. Japan Chemical Substance Dictionary (Nikkaji)
  9. NIST Mass Spectrometry Data Center
    LICENSE
    Data covered by the Standard Reference Data Act of 1968 as amended.
    https://www.nist.gov/srd/public-law
    4-Bromo-3-methylpyrazole
    http://www.nist.gov/srd/nist1a.cfm
  10. SpectraBase
    1H-PYRAZOLE, 4-BROMO-3-METHYL-
    https://spectrabase.com/spectrum/KT7wVdeK17y
  11. NMRShiftDB
  12. Springer Nature
  13. SpringerMaterials
  14. Thieme Chemistry
    LICENSE
    The Thieme Chemistry contribution within PubChem is provided under a CC-BY-NC-ND 4.0 license, unless otherwise stated.
    https://creativecommons.org/licenses/by-nc-nd/4.0/
  15. Wikidata
  16. Wiley
  17. PubChem
  18. GHS Classification (UNECE)
  19. NORMAN Suspect List Exchange
    LICENSE
    Data: CC-BY 4.0; Code (hosted by ECI, LCSB): Artistic-2.0
    https://creativecommons.org/licenses/by/4.0/
    NORMAN Suspect List Exchange Classification
    https://www.norman-network.com/nds/SLE/
  20. MolGenie
    MolGenie Organic Chemistry Ontology
    https://github.com/MolGenie/ontology/
  21. PATENTSCOPE (WIPO)
CONTENTS