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H20059

Sigma-Aldrich

4-Hydroxybenzoic acid

ReagentPlus®, 99%

Synonym(s):

p-HBA, p-Hydroxybenzoic acid

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100 G
$33.40
500 G
$104.00
1 KG
$105.00

$33.40

Available to ship onApril 29, 2025Details

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100 G
$33.40
500 G
$104.00
1 KG
$105.00

About This Item

Linear Formula:
HOC6H4CO2H
CAS Number:
99-96-7
Molecular Weight:
138.12
Beilstein/REAXYS Number:
970950
EC Number:
202-804-9
MDL number:
MFCD00002547
UNSPSC Code:
12352100
PubChem Substance ID:
24895495
NACRES:
NA.22

$33.40

Available to ship onApril 29, 2025Details

Request a Bulk Order

Quality Level

200

product line

ReagentPlus®

assay

99%

mp

213-217 °C (lit.)

solubility

alcohol: freely soluble

SMILES string

OC(=O)c1ccc(O)cc1

InChI

1S/C7H6O3/c8-6-3-1-5(2-4-6)7(9)10/h1-4,8H,(H,9,10)

InChI key

FJKROLUGYXJWQN-UHFFFAOYSA-N

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General description

4-Hydroxybenzoic acid (PHBA) is a phenolic derivative of benzoic acid, used as a building block in polymer synthesis.[1]

Application

4-Hydroxybenzoic acid can be used as a starting material to synthesize organic intermediates such as 4-acetoxybenzoic acid[2] and 4-hydroxy-3,5-diiodobenzoic acid.[3]

Legal Information

ReagentPlus is a registered trademark of Merck KGaA, Darmstadt, Germany

pictograms

CorrosionExclamation mark
GHS05,GHS07

signalword

Danger

hcodes

H318,H335

Hazard Classifications

Eye Dam. 1 - STOT SE 3

target_organs

Respiratory system

Storage Class

11 - Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
BCCM6983
BCCM1121
STBL1845
STBL2071
STBK7348

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Esterification of Carboxylic Acids with Trialkyloxonium Salts: Ethyl and Methyl 4?Acetoxybenzoates: Benzoic acid, 4?(acetyloxy)?, ethyl and methyl esters.
Douglas J, et al.
Organic Syntheses, 56, 59-59 (1977)
Formation of novel polymeric films derived from 4-hydroxybenzoic acid
Ferreira L, et al.
Materials Chemistry and Physics, 129, 46-52 (2011)
2?Hydroxy?3, 5?diiodobenzoic Acid.
Woollett G H and Johnson W W
Organic Syntheses, 14, 52-52 (1943)
Behrooz Darbani
International journal of molecular sciences, 22(11) (2021-06-03)
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L C Goudas et al.
Anesthesia and analgesia, 89(5), 1209-1215 (1999-11-30)
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Questions

1–2 of 2 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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