p-coumaric acid

4-Hydroxycinnamic acid

501-98-4

p-Hydroxycinnamic acid

trans-4-Hydroxycinnamic acid

7400-08-0

4-Coumaric acid

trans-p-Coumaric acid

p-Cumaric acid

3-(4-hydroxyphenyl)acrylic acid

p-Hydroxy-cinnamic acid

Para-Coumaric acid

Naringeninic acid

Hydroxycinnamic acid

(E)-p-Coumaric acid

trans-4-coumaric acid

trans-p-Coumarinic acid

(E)-3-(4-Hydroxyphenyl)acrylic acid

Cinnamic acid, p-hydroxy-

(E)-p-Hydroxycinnamic acid

2-propenoic acid, 3-(4-hydroxyphenyl)-, (2E)-

4'-hydroxycinnamic acid

trans-p-Hydroxycinnamic acid

p-Hydroxyphenylacrylic acid

(2E)-3-(4-hydroxyphenyl)prop-2-enoic acid

3-(4-Hydroxyphenyl)-2-propenoic acid

4-coumarate

Cinnamic acid, p-hydroxy-, (E)-

trans-p-Hydroxycinnamate

2-Propenoic acid, 3-(4-hydroxyphenyl)-

(E)-3-(4-Hydroxyphenyl)-2-propenoic acid

(E)-3-(4-hydroxyphenyl)prop-2-enoic acid

4-Hydroxycinnamate

(2E)-3-(4-hydroxyphenyl)acrylic acid

beta-(4-Hydroxyphenyl)acrylic acid

NSC 59260

trans-4-hydroxycinnamate

UNII-IBS9D1EU3J

IBS9D1EU3J

EINECS 231-000-0

Para coumaric acid

(E)-4-hydroxycinnamic acid

3-(4-hydroxyphenyl)prop-2-enoic acid

NSC 674321

p-coumarate

2-Propenoic acid, 3-(4-hydroxyphenyl)-, (E)-

BRN 2207381

BRN 2207383

CHEBI:32374

ORISTAR PCA

parahydroxycinnamic acid

MFCD00004399

NSC-59260

NSC-674321

4-hydroxy cinnamic acid

CHEMBL66879

PARA HYDROXYCINNAMIC ACID

beta-[4-Hydroxyphenyl]acrylic acid

0-10-00-00297 (Beilstein Handbook Reference)

4-10-00-01005 (Beilstein Handbook Reference)

NSC674321

trans-p-coumarate

Dehydroepiandrosterone-[D6] (CertiMass solution)

3-(4-hydroxyphenyl)acrylate

.beta.-[4-Hydroxyphenyl]acrylic acid

trans-HPPA

(E)-3-[4-hydroxyphenyl]-2-propenoic acid

4-coumaric acid, (E)-isomer

4-Hydroxycinnamicacid

trans-p-Cumaric Acid

4-Hydroxycinamic acid

.BETA.-(4-HYDROXYPHENYL)ACRYLIC ACID

2-Propenoic acid, 3-(4-hydroxyphenyl)-, (Z)-

CHEBI:36090

hydroxycinnamate

Para coumarate

p-coumaric-acid

Para-Coumarate

p-Cumarate

naringeninic-acid

p-Hydroxycinnamate

4qem

Coumaric acid, p-

4'-Hydroxycinnamate

4-Hydroxy cinnamate

p-Coumaric acid,trans

p-Coumaric acid 98%

4f8j

p-Coumaric acid, trans

4-Hydroxyphenylpropenoate

(2E)-3-(4-Hydroxyphenyl)-2-propenoic acid

trans-3-(4'-hydroxyphenyl)-2-propenoic acid

bmse000150

bmse000591

bmse010208

trans-4-HydroxycinnamicAcid

b-[4-Hydroxyphenyl]acrylate

SCHEMBL39106

p-hydroxycinnamic acid (M4)

MLS001066419

p-Hydroxycinnamic acid, trans

P-COUMARIC ACID [MI]

beta-[4-Hydroxyphenyl]acrylate

BDBM4374

GTPL5787

SODIUM2,4-PENTANEDIONATE

b-[4-Hydroxyphenyl]acrylic acid

trans-p-HydroxyzimtsA currencyure

DTXSID30901076

P-COUMARIC ACID [WHO-DD]

HMS1409E10

3-(4-Hydroxyphenyl)-2-propenoate

HYDROXYCINNAMIC ACID [INCI]

BCP22803

HY-N2391

NSC59260

STR06515

4-HYDROXYPHENYLPROPENOIC ACID

Cinnamic acid, 4-hydroxy-, trans-

AC7957

BBL012226

CK2547

s4759

s9564

STL163567

AKOS000120685

p-Coumaric acid;p-Hydroxycinnamic acid

BCP9001042

CCG-266309

CS-W020394

DB04066

p-Coumaric acid, >=98.0% (HPLC)

(E)-3-(4-hydroxyphenyl)prop-2-enoate

NCGC00246974-01

1ST40051

50940-26-6

AC-10318

AC-34130

AC-34133

AS-12000

BP-13278

SMR000112201

(E)-3-(4-hydroxyphenyl)prop-2-enoicacid

trans-p-Coumaric acid, analytical standard

AM20050138

NS00068187

EN300-17292

A19490

C00811

Q99374

(2E)-3-(4-Hydroxyphenyl)-2-propenoic acid #

A828008

AE-562/40414679

trans-p-Coumaric acid 1000 microg/mL in Acetone

Q-100560

W-104438

Z56911963

0C1BFF2D-2CF7-4FC1-9F76-3268C2C7F783

F2191-0188

p-Coumaric acid, primary pharmaceutical reference standard

(E)-3-(4-hydroxyphenyl)prop-2-enoate;Trans-4-Hydroxycinnamic Acid

InChI=1/C9H8O3/c10-8-4-1-7(2-5-8)3-6-9(11)12/h1-6,10H,(H,11,12)/b6-3

3,4-DIHYDROXYBENZOIC ACID

protocatechuic acid

99-50-3

Protocatehuic acid

4-Carboxy-1,2-dihydroxybenzene

protocatechuate

4,5-Dihydroxybenzoic acid

Benzoic acid, 3,4-dihydroxy-

3,4-dihydroxybenzoate

CCRIS 6291

protocatechuicacid

EINECS 202-760-0

UNII-36R5QJ8L4B

MFCD00002509

NSC 16631

BRN 1448841

36R5QJ8L4B

DTXSID4021212

CHEBI:36062

PROTOCATECHOIC ACID

NSC-16631

Catechol-4-carboxylic Acid

3, 4-Dihydroxybenzoic acid

CHEMBL37537

MLS000737807

DTXCID601212

FEMA NO. 4430

PROTOCATECHUIC ACID (PCA)

DIHYDROXYBENZOIC ACID, 3,4-

1ykp

DROXIDOPA METABOLITE (PROTOCATECHOIC ACID)

3,4-Dihydroxy Benzoic Acid

NSC16631

DB03946

SMR000528167

C00230

D-3487

Hypogallic acid

b-Resorcylate

beta-Resorcylate

ProtocatechicAcid

b-resorcylic acid

4fht

Protacatechuic Acid

ZINCSELENITE

Carbohydroquinonic acid

cid_72

Protocatechuic Acid,(S)

Protocatechuic acid (M1)

bmse000328

3,4-dihydroxy-benzoic acid

3,4-dihydroxybenzoic acid (protocatechuic acid)

SCHEMBL39435

3,4-Dihydroxybenzoate, VIII

Pyrocatechol-4-carboxylic Acid

PROTOCATECHUIC ACID [MI]

HMS2270A17

KUC104409N

HY-N0294

Tox21_200167

BBL012232

BDBM50100861

s3975

STL163570

AKOS000119632

AC-9617

CCG-207950

CS-6092

KSC-10-128

MCULE-8964889860

CAS-99-50-3

NCGC00246757-01

NCGC00246757-02

NCGC00257721-01

3,4-DIHYDROXYBENZOIC ACID [INCI]

AS-10808

SY014104

DB-021903

AM20060767

NS00014667

3,4-Dihydroxybenzoic acid, >=97.0% (T)

EN300-21544

3,4-Dihydroxybenzoic acid, analytical standard

F11285

3,4-dihydroxybenzoate;3,4-Dihydroxybenzoic acid

A846038

AE-562/40524392

Q418599

976C8CCE-B25D-4E0A-9A6F-3CEEA7A6964F

Z104501142

3,4-Dihydroxybenzoic acid, Vetec(TM) reagent grade, 97%

PROTOCATECHOIC ACID (CONSTITUENT OF MARITIME PINE)

Protocatechuic acid, primary pharmaceutical reference standard

PROTOCATECHOIC ACID (CONSTITUENT OF MARITIME PINE) [DSC]

Protocatechuic acid, United States Pharmacopeia (USP) Reference Standard

InChI=1/C7H6O4/c8-5-2-1-4(7(10)11)3-6(5)9/h1-3,8-9H,(H,10,11

1225528-47-1

4-HYDROXYBENZOIC ACID

99-96-7

p-Hydroxybenzoic acid

4-Carboxyphenol

p-Salicylic acid

Benzoic acid, 4-hydroxy-

para-Hydroxybenzoic acid

Benzoic acid, p-hydroxy-

p-carboxyphenol

Paraben-acid

4-Hydroxybenzoesaeure

p-Oxybenzoesaure

Kyselina 4-hydroxybenzoova

p-Oxybenzoesaure [German]

4-Hydroxybenzoicacid

NSC 4961

PHBA

parahydroxybenzoic acid

Acido p-idrossibenzoico

4-hydroxy-benzoic acid

Hydroxybenzoic acid

HSDB 7233

Acido p-idrossibenzoico [Italian]

Kyselina 4-hydroxybenzoova [Czech]

EINECS 202-804-9

UNII-JG8Z55Y12H

CCRIS 8812

JG8Z55Y12H

DTXSID3026647

CHEBI:30763

HYDROXYBENZOIC ACID, PARA

p-hydroxy benzoic acid

AI3-01003

p-hydroxy-Benzoic acid

NSC-4961

Benzoic acid, 4-hydroxy

Hydroxybenzenecarboxylic acid

4-HBA

CHEMBL441343

DTXCID806647

FEMA NO. 3986

EC 202-804-9

MFCD00002547

3pcc

3pch

4-hydroxy-benzoate

4-hydroxy benzoic acid

Benzoic acid, p-hydroxy

WLN: QVR DQ

PHB

CAS-99-96-7

NSC4961

SALICYLIC ACID IMPURITY A (EP IMPURITY)

SALICYLIC ACID IMPURITY A [EP IMPURITY]

DB04242

NCGC00166040-01

ACETYLSALICYLIC ACID IMPURITY A (EP IMPURITY)

ACETYLSALICYLIC ACID IMPURITY A [EP IMPURITY]

PROPYL HYDROXYBENZOATE IMPURITY A (EP IMPURITY)

PROPYL HYDROXYBENZOATE IMPURITY A [EP IMPURITY]

METHYL PARAHYDROXYBENZOATE IMPURITY A (EP IMPURITY)

METHYL PARAHYDROXYBENZOATE IMPURITY A [EP IMPURITY]

C00156

p-Salicylate

AE-848/32195059

p-hydroxy-Benzoate

4-hydoxybenzoic acid

4-hyroxybenzoic acid

phenol derivative, 8

4-hydroxylbenzoic acid

4-Hydroxy-benzoesaeure

4-hydroxybenzoi c acid

PHLORETIN_met004

4-hydroxyl benzoic acid

4-Hydroxybenzoate, III

AVOBENZONE_met002

para-hydroxy benzoic acid

bmse000092

bmse000583

SCHEMBL4110

BIDD:ER0706

4-Hydroxybenzenecarboxylic acid

p-Hydroxybenzoic Acid, Reagent

BDBM26194

P-HYDROXYBENZOIC ACID [MI]

CS-D1180

HY-Y0264

STR01287

Tox21_202342

Tox21_303301

AC-008

BBL011981

s3754

STL138745

4-HYDROXYBENZOIC ACID [FHFI]

4-HYDROXYBENZOIC ACID [HSDB]

4-HYDROXYBENZOIC ACID [INCI]

4-Hydroxybenzoic acid, >=99%, FG

AKOS000119033

AM87513

CCG-266143

MCULE-1367764897

NCGC00166040-02

NCGC00257058-01

NCGC00259891-01

H0207

NS00005418

4-Hydroxybenzoic acid, ReagentPlus(R), 99%

EN300-21461

D86505

4-Hydroxybenzoic acid, ReagentPlus(R), >=99%

4-Hydroxybenzoic acid, puriss., >=99.0% (T)

A858402

Q229970

46DD083D-BFD3-4CE1-B2D9-6C6D5FEFD3D9

J-660066

W-100004

4-Hydroxybenzoic acid, Vetec(TM) reagent grade, 99%

2-3-4'-TRIHYDROXY-4-METHOXYBENZOPHENONE_met005

F2191-0237

Z104498098

2-3-DIHYDROXY-4-METHOXY-4'-ETHOXYBENZOPHENONE_met009

4-Hydroxybenzoic acid, certified reference material, TraceCERT(R)

4-Hydroxybenzoic acid, Pharmaceutical Secondary Standard; Certified Reference Material

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

30729-36-3

The Henry's Law constant for 4-hydroxybenzoic acid is estimated as 7.2X10-12 atm-cu m/mole(SRC) derived from its extrapolated vapor pressure, 1.9X10-7 mm Hg(1), and water solubility, 5000 mg/L(2). This Henry's Law constant indicates that 4-hydroxybenzoic acid is expected to be essentially nonvolatile from water surfaces(3). 4-Hydroxybenzoic acid's estimated Henry's Law constant indicates that volatilization from moist soil surfaces is not expected to occur(SRC). In addition, 4-hydroxybenzoic acid's pKa value of 4.54(4) indicates that it will exist almost entirely as an anion at pH values of 5 to 9 and therefore volatilization from water and moist soil surfaces is not expected to be an important fate process(SRC). 4-Hydroxybenzoic acid is not expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(1).
Literature: (1) Jones AH; J Chem Eng Data 5:196-200 (1960) (2) Yalkowsky SH, He Y, eds; Handbook of aqueous solubility data. Boca Raton, FL: CRC Press p. 377 (2003) (3) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990) (4) Bykova LN et al; Zh Obshch Khim 40: 2295-300 (1970)

Koc values of 142, 20, and 14 were measured according to a modified version of OECD guideline 106 for 4-hydroxybenzoic acid in a podzol (pH=2.8, C organic=4.85%, sand:silt:clay=89.2:8.2:2.6%), alfisol (pH=6.7, C organic=1.25%, sand:silt:clay=69.7:14.4:15.9%), and a sediment (pH=7.1, C organic=1.58%, sand:silt:clay=5.5:58.8:35.7%), respectively(1). According to a classification scheme(2), these Koc values suggest that 4-hydroxybenzoic acid is expected to have high to very high mobility in soil. The pKa of 4-hydroxybenzoic acid is 4.54(3), indicating that this compound will primarily exist in anion form in the environment and anions generally do not adsorb more strongly to organic carbon and clay than their neutral counterparts(4).
Literature: (1) Vonoepen B et al; Chemosphere 22: 285-304 (1991) (2) Swann RL et al; Res Rev 85: 17-28 (1983) (3) Bykova LN et al; Zh Obshch Khim 40: 2295-300 (1970) (4) Doucette WJ; pp. 141-188 in Handbook of Property Estimation Methods for Chemicals. Boethling RS, Mackay D, eds. Boca Raton, FL: Lewis Publ (2000)