4,4′-Oxybis(benzoic acid) - ≥98% , CAS No.2215-89-6

CAS: 2215-89-6 Cat. No.: O102218 Molecular Weight: 258.23 EC Number: 218-683-0
AVAILABLE TO ORDER
GRADE & PURITY ≥98%
Synonyms
4,4'-Dicarboxydiphenyl Ether | Diphenyl Ether 4,4'-Dicarboxylic Acid | 4,4'-Oxybisbenzoic Acid
Storage
Room temperature
Shipped In
Normal
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Size
Status
Price
Qty
25g
O102218-25g
3

$11.90

$17.90
Save $6.00 (33.52%)
100g
O102218-100g
3

$46.90

$70.90
Save $24.00 (33.85%)
250g
O102218-250g
1

$107.90

$161.90
Save $54.00 (33.35%)
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Why this grade

≥98% for sensitive chromatographic and analytical workflows requiring minimal baseline interference.

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Storage & shipping

Room temperature Ships Normal Check lot-specific COA for exact specifications.

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Quality documents

SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.

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Literature proof

Cited in 41 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Specifications

Synonyms
4, 4'-Dicarboxydiphenyl Ether | Diphenyl Ether 4, 4'-Dicarboxylic Acid | 4, 4'-Oxybisbenzoic Acid
Specifications & Purity
≥98%
Storage
Room temperature
Shipped In
Normal
Purity
≥98%
Names and Identifiers
Pubchem Sid504754921
Pubchem Sid Urlhttps://pubchem.ncbi.nlm.nih.gov/substance/504754921
Canonical SmilesC1=CC(=CC=C1C(=O)O)OC2=CC=C(C=C2)C(=O)O
IUPAC Name4-(4-carboxyphenoxy)benzoic acid
InChIKeyWVDRSXGPQWNUBN-UHFFFAOYSA-N
INCHI1S/C14H10O5/c15-13(16)9-1-5-11(6-2-9)19-12-7-3-10(4-8-12)14(17)18/h1-8H,(H,15,16)(H,17,18)
Isomeric SMILES C1=CC(=CC=C1C(=O)O)OC2=CC=C(C=C2)C(=O)O
WGK Germany 3
Molecular Weight 258.23
Reaxy-Rn 2218315
Reaxys-RN_link_address https://www.reaxys.com/reaxys/secured/hopinto.do?context=S&query=IDE.XRN=2218315&ln=

Documentation

📋 Safety Data Sheet (SDS)

Comprehensive hazard, handling, storage, and regulatory compliance document.

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✅ Certificate of Analysis (COA)

Lot-specific quality data. Enter your lot number to retrieve the exact COA.

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📊 Datasheet

Quick-reference summary of product specifications and applications.

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🔬 Specification Sheet

Full quality attributes and acceptance criteria for this grade.

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Advanced Data

Taxonomic Classification

Taxonomy Tree

KingdomOrganic compounds
SuperclassBenzenoids
ClassBenzene and substituted derivatives
SubclassDiphenylethers
Intermediate Tree Nodes Not available
Direct ParentDiphenylethers
Alternative Parents Diarylethers  Benzoic acids  Phenoxy compounds  Phenol ethers  Benzoyl derivatives  Dicarboxylic acids and derivatives  Carboxylic acids  Organic oxides  Hydrocarbon derivatives  
Molecular FrameworkAromatic homomonocyclic compounds
Substituents Diphenylether - Diaryl ether - Benzoic acid or derivatives - Benzoic acid - Phenoxy compound - Benzoyl - Phenol ether - Dicarboxylic acid or derivatives - Carboxylic acid derivative - Carboxylic acid - Ether - Hydrocarbon derivative - Organic oxygen compound - Organooxygen compound - Organic oxide - Aromatic homomonocyclic compound
DescriptionThis compound belongs to the class of organic compounds known as diphenylethers. These are aromatic compounds containing two benzene rings linked to each other through an ether group.
External Descriptors Not available
3D Structure
Interactive Chemical Structure Model





Certificates(CoA,COO,BSE/TSE and Analysis Chart)
C of A & Other Certificates(BSE/TSE, COO):
Analytical Chart:

Find and download the COA for your product by matching the lot number on the packaging.

17 results found

Lot NumberCertificate TypeDateItem
H2205514Certificate of AnalysisMay 18, 2026 O102218
H2205513Certificate of AnalysisMay 18, 2026 O102218
H2205511Certificate of AnalysisMay 18, 2026 O102218
F2612147Certificate of AnalysisMar 08, 2025 O102218
F2617067Certificate of AnalysisMar 08, 2025 O102218
G2523433Certificate of AnalysisMar 08, 2025 O102218
G2523434Certificate of AnalysisMar 08, 2025 O102218
G2523455Certificate of AnalysisMar 08, 2025 O102218
J2415583Certificate of AnalysisSep 29, 2024 O102218
J2415578Certificate of AnalysisSep 29, 2024 O102218
J2415577Certificate of AnalysisSep 29, 2024 O102218
F2429297Certificate of AnalysisJun 17, 2024 O102218
G2021160Certificate of AnalysisMay 08, 2024 O102218
C2414689Certificate of AnalysisFeb 28, 2024 O102218
C2204373Certificate of AnalysisJan 10, 2022 O102218
C2204354Certificate of AnalysisJan 10, 2022 O102218
C2204335Certificate of AnalysisJan 10, 2022 O102218

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Chemical and Physical Properties
SolubilityInsoluble in water
Melt Point(°C)329-332°C
Molecular Weight258.230 g/mol
XLogP33.400
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count5
Rotatable Bond Count4
Exact Mass258.053 Da
Monoisotopic Mass258.053 Da
Topological Polar Surface Area83.800 Ų
Heavy Atom Count19
Formal Charge0
Complexity293.000
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
The total count of all stereochemical bonds0
Covalently-Bonded Unit Count1
Citations of This Product
References
1. Zhipeng Xu, Qiuping Wang, Liang Guo, Yeyang Li, Junyao Wang, Shuaijun Yu, Junbin Liao, Yanqing Xu, Jiangnan Shen.  (2023)  Porphyrin Helical Nanochannel-Assembled Polybenzimidazole Membranes Doped with Phosphoric Acid for Fuel Cells Operating in a Temperature Range of 25–200 °C.  ADVANCED FUNCTIONAL MATERIALS,      [PMID:] [10.1002/adfm.202310762]
2. Tianmeng Liu, Shuqiang Xiong, Qinchao Sun, Junrong Yu, Yan Wang, Zuming Hu.  (2023)  Redox Responsive Sol–Gel Transition: A New Concept for Continuous Spinning of High-Performance and Recyclable Aerogel Fibers.  CHEMISTRY OF MATERIALS,      [PMID:] [10.1021/acs.chemmater.3c01308]
3. Yiming Xiao, Haoran Chen, Ranxin Sun, Lei Zhang, Jun Xiang, Penggao Cheng, Huaiyuan Han, Songbo Wang, Na Tang.  (2023)  Poly(ionic liquid)/OPBI Composite Membrane with Excellent Chemical Stability for High-Temperature Proton Exchange Membrane.  Polymers,  15  (15): (3197).  [PMID:37571092] [10.3390/polym15153197]
4. Chen Li, Ketong Song, Chunxiao Hao, Wanting Liang, Xiaoyun Li, Wenjin Zhang, Ying Wang, Yuefei Song.  (2023)  Fabrication of S-PBI cation exchange membrane with excellent anti-fouling property for enhanced performance in electrodialysis.  COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,      [PMID:] [10.1016/j.colsurfa.2022.130910]
5. Tianmeng Liu, Yan Wang, Junrong Yu, Zuming Hu.  (2022)  Recyclable and high-performance metal coordination bonds cross-linked polybenzimidazole aerogels for flame retardancy, thermal insulation and dyes adsorption applications.  COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING,      [PMID:] [10.1016/j.compositesa.2022.107253]
6. Xu Tang-Cheng, Wang Chang-Shui, Hu Zhao-Yu, Zheng Jiao-Jiao, Jiang Shao-Hua, He Shui-Jian, Hou Hao-Qing.  (2022)  High Strength and Stable Proton Exchange Membrane Based on Perfluorosulfonic Acid/Polybenzimidazole.  CHINESE JOURNAL OF POLYMER SCIENCE,  40  (7): (764-771).  [PMID:] [10.1007/s10118-022-2708-2]
7. Yiming Xiao, Qixuan Ma, Xiaoyu Shen, Songbo Wang, Jun Xiang, Lei Zhang, Penggao Cheng, Xinjun Du, Zhen Yin, Na Tang.  (2022)  Facile preparation of polybenzimidazole membrane crosslinked with three-dimensional polyaniline for high-temperature proton exchange membrane.  JOURNAL OF POWER SOURCES,      [PMID:] [10.1016/j.jpowsour.2022.231218]
8. Xiaorui Wang, Di Wang, Shuang Wang, Jinsheng Li, Geng Liu, Yinghe Cui, Dan Liang, Xiaodong Wang, Zhipeng Yong, Zhe Wang.  (2022)  High-Performance Proton Exchange Membranes Based on Block Polybenzimidazole and Organic–Inorganic Fillers with a Low Acid Doping Level.  ACS Applied Energy Materials,      [PMID:] [10.1021/acsaem.1c04073]
9. Zhao Xuhui, Nan Bohua, Lu Yunhua, Zhao Chunyan, Xu Shiai.  (2021)  Phosphorylated graphene oxide-reinforced polybenzimidazole composite membrane for high-temperature proton exchange membrane fuel cell.  JOURNAL OF POLYMER RESEARCH,  28  (12): (1-15).  [PMID:] [10.1007/s10965-021-02846-x]
10. Jierui Song, Yiming Xiao, Lei Zhang, Jun Xiang, Na Tang, Penggao Cheng, Jianping Zhang, Songbo Wang, Wei Du.  (2021)  Macromolecule sulfonated Poly(ether ether ketone) crosslinked poly(4,4′-diphenylether-5,5′-bibenzimidazole) proton exchange membranes: Broaden the temperature application range and enhanced mechanical properties.  INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,      [PMID:] [10.1016/j.ijhydene.2021.06.055]
11. Wenbo Bai, Guoxu Qin, Jing Wang, Lei Li, Yonghong Ni.  (2021)  2-Aminoterephthalic acid co-coordinated Co-MOF fluorescent probe for highly selective detection of the organophosphorus pesticides with p-nitrophenyl group in water systems.  DYES AND PIGMENTS,      [PMID:] [10.1016/j.dyepig.2021.109473]
12. Dandan Jin, Santosh Khanal, Shiai Xu.  (2021)  Effects of ZnAl layered double hydroxide and benzimidazole derivative on the dechlorination of poly(vinyl chloride).  APPLIED CLAY SCIENCE,      [PMID:] [10.1016/j.clay.2021.106114]
13. Ke Jin, Yuhui Huang, Yudi Feng, Jia Guo, Jiangtao Xu, Changchun Wang.  (2020)  Soluble, Thermally Stable, and Low Thermal Expansion Polyarylamides Enabled by a Seven-Membered Carbocycle.  ACS Applied Polymer Materials,      [PMID:] [10.1021/acsapm.0c00754]
14. Yiming Xiao, Shihao Wang, Guiying Tian, Jun Xiang, Lei Zhang, Penggao Cheng, Jianping Zhang, Na Tang.  (2020)  Preparation and molecular simulation of grafted polybenzimidazoles containing benzimidazole type side pendant as high-temperature proton exchange membranes.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2020.118858]
15. Donghao Liu, Jun Peng, Li Chen, Yan Zhang, Xiaoyang Han, Ping Yang, Hua He.  (2020)  Solid phase extraction-based magnetic carbon nitride/metal organic framework composite with high performance liquid chromatography for the determination of tyrosine kinase inhibitors in urine samples.  Analytical Methods,  12  (39): (4798-4805).  [PMID:32955051] [10.1039/D0AY01243B]
16. Ning Wei, Xudong Zheng, Qiao Li, Chenxia Gong, Hongxiang Ou, Zhongyu Li.  (2020)  Construction of lanthanum modified MOFs graphene oxide composite membrane for high selective phosphorus recovery and water purification.  JOURNAL OF COLLOID AND INTERFACE SCIENCE,      [PMID:31978796] [10.1016/j.jcis.2020.01.031]
17. Ye Qi, Junwei Ye, Shuangsong Ren, Jialin Lv, Siqi Zhang, Ying Che, Guiling Ning.  (2019)  In-situ synthesis of metal nanoparticles@metal−organic frameworks: Highly effective catalytic performance and synergistic antimicrobial activity.  JOURNAL OF HAZARDOUS MATERIALS,      [PMID:31784130] [10.1016/j.jhazmat.2019.121687]
18. Dandan Jin, Shiai Xu.  (2018)  The effects of polybenzimidazole and polyacrylic acid modified carbon black on the anti-UV-weathering and thermal properties of polyvinyl chloride composites.  COMPOSITES SCIENCE AND TECHNOLOGY,      [PMID:] [10.1016/j.compscitech.2018.08.016]
19. Guo-Cheng Liu, Yan Li, Ying Xiong, Xiang-Xiang Liu, Qiao-Min Li, Ju-Wen Zhang, Hong-Yan Lin, Xiao-Wu Li.  (2018)  Spacers-directed structural diversity of Co(II)/Zn(II) complexes based on S-/O-bridged dipyridylamides: electrochemical, fluorescent recognition behavior and photocatalytic properties.  JOURNAL OF COORDINATION CHEMISTRY,      [PMID:] [10.1080/00958972.2018.1438606]
20. Yangben Cai, Zhouying Yue, Xin Teng, Shiai Xu.  (2018)  Radiation grafting graphene oxide reinforced polybenzimidazole membrane with a sandwich structure for high temperature proton exchange membrane fuel cells in anhydrous atmosphere.  EUROPEAN POLYMER JOURNAL,      [PMID:] [10.1016/j.eurpolymj.2018.02.020]
21. Kang Hu, Chuangen Yin, Jinchen Fan, Yulin Min, Qunjie Xu.  (2017)  High-concentration polybenzimidazole-assisted exfoliation of boron nitride nanoflakes for polymer composites.  POLYMER COMPOSITES,  39  (12): (4285-4297).  [PMID:] [10.1002/pc.24504]
22. Tianyu Fan, Fengxiang Yin, Hao Wang, Xiaobo He, Guoru Li.  (2017)  A metal–organic-framework/carbon composite with enhanced bifunctional electrocatalytic activities towards oxygen reduction/evolution reactions.  INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,      [PMID:] [10.1016/j.ijhydene.2017.02.063]
23. Qiao Zhi, Gao Chunfeng, Sun Bing, Ai Shiyun.  (2013)  Synthesis and Characterization of Functionalized Multi-walled Carbon Nanotubes/Exfoliated Layered Double Hydroxide Nanosheets Hybrids via Electrostatic Force.  Journal of Inorganic and Organometallic Polymers and Materials,  23  (4): (871-876).  [PMID:] [10.1007/s10904-013-9854-5]
24. Jie Liu, Xiaoqian Guo, Rongyang Zhai, Peng Sun, Jianyun Ding, Zhaoyang Wei, Weiwei Lei, Dean Shi.  (2024)  A highly stretchable disulfide-crosslinked epoxidized natural rubber by one-step method.  POLYMER,      [PMID:] [10.1016/j.polymer.2024.127842]
25. Wei-Min Chen, Juan-Juan Shao, Fang-Ming Wang.  (2024)  A ratiometric fluorescent probe quickly responding for Pb2+ with the biggest red-shift stokes based on a new bimetallic MOF.  MICROCHEMICAL JOURNAL,      [PMID:] [10.1016/j.microc.2024.112333]
26. Caixia Zhao, Sheng Yang, Tian Fu, Wang Qin, Yaqi Yang, Guoxiang Zou.  (2024)  Aliphatic-aromatic copolyesters containing monophenyl terephthalic acid and biphenyl 4,4′-oxybisbenzoic acid: Influence of composition and chemical microstructure on thermal and mechanical properties.  JOURNAL OF APPLIED POLYMER SCIENCE,      [PMID:] [10.1002/app.56219]
27. Yiming Xiao, Haoran Chen, Xiaoyu Shen, Yuanyuan Li, Lei Zhang, Penggao Cheng, Huaiyuan Han, Na Tang.  (2024)  Construction of wide-temperature-range proton exchange membrane by regulating proton transfer channels based on phosphate-functionalized carbon nanotubes.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2024.123077]
28. Yufei Gao, Chunxue Wang, Han Ye, Ying Zhang.  (2024)  Highly ion-selective sulfonated poly (4,4′-diphenylether-5,5′-bibenzimidazole) membranes for vanadium redox flow battery.  Journal of Experimental Nanoscience,      [PMID:] [10.1080/17458080.2024.2327288]
29. Jiaqi Ji, Tianqi Yang, Weiyu Zhang, Jie Li, Hong Li, Yi Tang, Weiyi Jin, Yiming Sun, Keda Li, Wei Li, Xiaoquan Ding, Chenliang Gong.  (2025)  Triazine-rich covalent organic framework composited proton exchange membranes for flexible operating temperature and enhanced long-term stability fuel cells.  JOURNAL OF POWER SOURCES,      [PMID:] [10.1016/j.jpowsour.2025.236351]
30. Xiaoming Liu, Yuqi Liu, Nanhao Jin, Yue Zhao, Han Chen, Xinying Wang, Yuebin Feng, Huilong Luo, Wei Li.  (2025)  A novel cobalt-based complex as efficient peroxymonosulfate activator to degrade aqueous Rhodamine B, Methylene Blue and Methyl Orange.  INORGANIC CHEMISTRY COMMUNICATIONS,      [PMID:] [10.1016/j.inoche.2025.115276]
31. Yiyang Zeng, Shuai Yang, Mao Yang, Yu Gong, Xingrui Tang, Xiaolong Fu, Junyan Wang, Guangming Ran, Chengjian Xiao.  (2025)  High-performance o-PBI membranes with continuous cavities for enhanced proton conductivity.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2025.124634]
32. Xiyang Liu, Deqi Zeng, Wenheng Huang, Jinchao Li, Liang Chen, Qin Chen, Ming Wang, Yaping Zhang.  (2025)  Porous branched polybenzimidazole membranes with high ion conductivity and selectivity for vanadium flow battery.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2025.124725]
33. Haoren Zheng, Yulin Wu, Xin Liu, Pengzhu Gai, Dezhu Zhang, Yixing Wang, Kang Huang, Zhi Xu.  (2025)  Efficiently ion-selective polybenzimidazole membrane with precisely controlled channels and hydrogen-bond networks for flow batteries.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2025.124733]
34. Guoxu Qin, Jiali Wang, Yaqiong Kong, Rong Wu, Duojun Cao, Xiangzi Li, Xiaoyong Xu.  (2025)  Ultrasensitive and Visualized Rapid Detection of Organophosphorus Pesticides Using Ultrathin 2D Eu3+@Cd-MOF Fluorescent Nanosheets.  APPLIED ORGANOMETALLIC CHEMISTRY,  39  (5): (e70155).  [PMID:] [10.1002/aoc.70155]
35. Yiming Xiao, Zetao Yang, Haoran Chen, Yifang Gao, Jianxiang He, Guiying Tian, Lei Zhang, Penggao Cheng, Na Tang.  (2025)  Quaternized porphyrin crosslinked polybenzimidazole membrane with dual-ion pair structure as HT-PEM: Enhanced proton conductivity and stability.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2025.124618]
36. Qi Zhang, Yuhao Wang, Jing Zhong, Xiuxiu Ren.  (2025)  Preparation and Characterization of MOF-Doped Sulfonated Polybenzimidazole Proton Exchange Membranes.  JOURNAL OF APPLIED POLYMER SCIENCE,      [PMID:] [10.1002/app.58118]
37. Minghao Zhai, Wanan Cai, Jingtao An, Chunli Ma, Tingting Zhou, Haijun Niu, Wen Wang.  (2025)  Polyamides containing triazine fused by triphenelamine with D-A block for improving performance of efficient and stable electrochromic/electrofluorochromic bifunctional device in display and camouflage.  Materials Today Chemistry,      [PMID:] [10.1016/j.mtchem.2025.103228]
38. Tao Wei, Yun Zhao, Yangkai Han, Zhiwei Ren, Haijiao Xie, Haitao Zhang, Zhigang Shao.  (2026)  Synergistic fluorine-imidazolium interactions enhance phosphoric acid retention in ion-pair membranes for high-temperature proton exchange membrane fuel cells.  CHEMICAL ENGINEERING JOURNAL,      [PMID:] [10.1016/j.cej.2026.172741]
39. Jiapeng Yang, Jinyu Guan, Xuting Ma, Wenlong Xu, Chukun Zheng, Yuange Cao, Wanzhen Wu, Xianfeng Guan, Shuyu Zhang, Shuang Wang.  (2026)  Tröger’s base-based cross-linker for suppressing acid leaching and enhancing durability of high-temperature polymer electrolyte membranes.  POLYMER DEGRADATION AND STABILITY,      [PMID:] [10.1016/j.polymdegradstab.2026.112004]
40. Chao Meng, Xiaofeng Hao, Shuanjin Wang, Dongmei Han, Sheng Huang, Jin Li, Min Xiao, Yuezhong Meng.  (2026)  Nanostructured POSS Crosslinked Polybenzimidazole with Free Radical Scavenging Function for High-Temperature Proton Exchange Membranes.  Nanomaterials,  16  (3): (164).  [PMID:41677514] [10.3390/nano16030164]
41. Weiyi Jin, Tianqi Yang, Yi Tang, Weiyu Zhang, Miao Tong, Xiangdong Zhang, Chenliang Gong.  (2026)  Covalent immobilization of perfluorophenylphosphonic acid to simultaneously achieve high stability and proton conductivity for high-temperature proton exchange membrane.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2026.125400]
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