3153-36-4

Basic information

• Product Name: ETHYL 4-CHLOROBUTYRATE
• Synonyms: 4-Chlorobutanoic acid ethyl ester;Butyric acid, 4-chloro-, ethyl ester;Cl(CH2)3C(O)OC2H5;Ethyl 4-chlorobutanoate;Ethyl omega-chlorobutyrate;gamma-Chlorobutyric acid ethyl ester;ETHYL-GAMMA-CHLOROBUTYRATE;ETHYL 4-CHLOROBUTYRATE
• CAS NO: 3153-36-4
• Molecular Formula: C₆H₁₁ClO₂
• Molecular Weight: 150.6
• EINECS: 221-591-3
• Product Categories: Aromatic Esters;C6 to C7;Carbonyl Compounds;Esters;Aliphatics;Miscellaneous Reagents;Building Blocks;C6 to C7;Carbonyl Compounds;Chemical Synthesis;Organic Building Blocks
• Mol File: 3153-36-4.mol
• Article Data: 11

Chemical Properties

• Boiling Point: 186 °C(lit.)
• Flash Point: 125 °F
• Appearance: Clear yellow to brownish/Liquid
• Density: 1.075 g/mL at 25 °C(lit.)
• Vapor Pressure: 0.678mmHg at 25°C
• Refractive Index: n20/D 1.432(lit.)
• Storage Temp.: Flammables area
• Water Solubility: Insoluble
• BRN: 1098810
• CAS DataBase Reference: ETHYL 4-CHLOROBUTYRATE(CAS DataBase Reference)
• NIST Chemistry Reference: ETHYL 4-CHLOROBUTYRATE(3153-36-4)
• EPA Substance Registry System: ETHYL 4-CHLOROBUTYRATE(3153-36-4)

Safety Data

• Hazard Codes: Xi,Xn
• Statements: 36/37/38-22-10
• Safety Statements: 26-36-37/39-16-24/25
• RIDADR: 1993
• WGK Germany: 3
• F: 21
• HazardClass: 3.2
• PackingGroup: III
• Hazardous Substances Data: 3153-36-4(Hazardous Substances Data)

Usage

Chemical Properties

clear yellow to brownish liquid

Uses

Different sources of media describe the Uses of 3153-36-4 differently. You can refer to the following data:
1. Ethyl 4-chlorobutyrate is a reagent used in the preparation of cyclopropane derivatives.
2. Ethyl 4-chlorobutyrate is used in organic synthesis. And also used for producting 4-Iodo-butyric acid ethyl ester.

Synthesis Reference(s)

Synthesis, p. 538, 1973 DOI: 10.1055/s-1973-22254

InChI:InChI=1/C6H11ClO2/c1-2-9-6(8)4-3-5-7/h2-5H2,1H3

Synthetic route

4-butanolide (96-48-0) + ethanol (64-17-5) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
With thionyl chloride for 16h; Heating;	80%
With hydrogenchloride
With hydrogenchloride

cyclobutanone (1191-95-3) + oxovanadium(V) ethoxydichloride (1801-77-0) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
With lithium chloride In diethyl ether for 13h; Ambient temperature;	43%

ethyl 4-chloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)butanoate → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
With trimethylsilyl trifluoromethanesulfonate; 4-tert-Butylcatechol; 2-methoxybenzo[d][1,3,2]dioxaborole; trans-di-O-tert-butyl hyponitrite In methanol; dichloromethane; benzene at 70℃; for 16h; Inert atmosphere;	30%

1,4-dioxane (123-91-1) + 4-ethoxy-butyryl chloride (14077-66-8) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
at 70℃; Geschwindigkeit der Umlagerung verschiedener Konz.;
at 100℃; Geschwindigkeit der Umlagerung verschiedener Konz.;

4-butanolide (96-48-0) + ethanol (64-17-5) → 4-chloro-butyric acid ethyl ester (3153-36-4) + 4-(4-chloro-butyryloxy)-butyric acid ethyl ester

Conditions	Yield
With hydrogenchloride

4-Chlorobutyronitrile (628-20-6) + ethanol (64-17-5) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
With hydrogenchloride
With sulfuric acid
With hydrogenchloride
With hydrogenchloride In dichloromethane at 8℃;

ethanol (64-17-5) + 4-(4-nitrophenoxy)butanoic acid (28341-54-0) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
With hydrogenchloride zuletzt bei Siedetemperatur;

4-ethoxy-butyryl chloride (14077-66-8) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
at 100℃;
at 100℃;
at 50℃; Geschwindigkeit der Umlagerung;
at 100℃; Geschwindigkeit der Umlagerung;

4-ethoxybutanoic acid (10374-37-5) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
With thionyl chloride
Multi-step reaction with 2 steps 1: hydrogen; SOCl2 2: 100 °C / Geschwindigkeit der Umlagerung View Scheme
Multi-step reaction with 2 steps 1: hydrogen; SOCl2 2: 100 °C View Scheme

butanoic acid ethyl ester (105-54-4) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
With tetrachloromethane; sulfuryl dichloride; dibenzoyl peroxide

γ-chlorobutyric acid (627-00-9) + ethanol (64-17-5) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
With sulfuric acid
With thionyl chloride at 0℃; for 2h; Reflux;
With acetyl chloride at 20℃; for 24h; Inert atmosphere;

cyclobutanone (1191-95-3) + oxovanadium(V) ethoxydichloride (1801-77-0) + acrylonitrile (107-13-1) → 4-chloro-butyric acid ethyl ester (3153-36-4) + ethyl 6-chloro-6-cyanohexanoate (132960-08-8)

Conditions	Yield
With copper dichloride 1.) dichloromethane, -75 deg C, 2.) a) -75 deg C, 2 h, b) room temperature, 14-19 h; Yield given. Multistep reaction. Yields of byproduct given;

cyclobutanone (1191-95-3) + oxovanadium(V) ethoxydichloride (1801-77-0) + methacrylic acid methyl ester (80-62-6) → 4-chloro-butyric acid ethyl ester (3153-36-4) + ethyl 6-chloro-6-(methoxycarbonyl)heptanoate (132960-09-9)

Conditions	Yield
With copper dichloride 1.) dichloromethane, -75 deg C, 2.) a) -75 deg C, 2 h, b) room temperature, 14-19 h; Yield given. Multistep reaction. Yields of byproduct given;

cyclobutanone (1191-95-3) + oxovanadium(V) ethoxydichloride (1801-77-0) + methacrylonitrile (126-98-7) → 4-chloro-butyric acid ethyl ester (3153-36-4) + ethyl 6-chloro-6-cyanoheptanoate (132960-07-7)

Conditions	Yield
With copper dichloride Product distribution; multistep reaction; other olefins, or LiCl, other halogen source, other cyclic carbonyl compound; oxidative ring-opening reaction;
With copper dichloride 1.) dichloromethane, -75 deg C, 2 h, 2.) a) -75 deg C, 2 h, b) room temperature, 17 h; Yield given. Multistep reaction. Yields of byproduct given;

ethanol (64-17-5) + 4-Chlorobutanoyl chloride (4635-59-0) → 4-chloro-butyric acid ethyl ester (3153-36-4)

tetrachloromethane (56-23-5) + sulfuryl dichloride (7791-25-5) + butanoic acid ethyl ester (105-54-4) + dibenzoyl peroxide (94-36-0) → 4-chloro-butyric acid ethyl ester (3153-36-4) + ethyl 2-chlorobutyrate (7425-45-8) + 3-chloro-butyric acid ethyl ester (7425-48-1)

thionyl chloride (7719-09-7) + 4-ethoxybutanoic acid (10374-37-5) → 4-chloro-butyric acid ethyl ester (3153-36-4)

5,11,17,23-tetra-tert-butyl-25,27-di(3-ethoxycarbonylpropoxy)-26,28-dihydroxycalix[4]arene (205995-80-8) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
With titanium(IV) chloride tetrahydrofuran In toluene for 24h; Inert atmosphere; Reflux;

ethyl 3-(4,4,5,5,-tetramethyl-[1,3,2]dioxaborolan-2-yl)-propionate (302577-73-7) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions	Yield
Multi-step reaction with 2 steps 1: n-butyllithium / tetrahydrofuran; diethyl ether / 16 h / -100 - 20 °C / Inert atmosphere 2: trimethylsilyl trifluoromethanesulfonate; 4-tert-Butylcatechol; trans-di-O-tert-butyl hyponitrite; 2-methoxybenzo[d][1,3,2]dioxaborole / dichloromethane; benzene; methanol / 16 h / 70 °C / Inert atmosphere View Scheme

ethyl acrylate (140-88-5) → 4-chloro-butyric acid ethyl ester (3153-36-4)

Conditions

Yield

Multi-step reaction with 3 steps 1.1: copper(II) carbonate; copper(II) hydroxide; triphenylphosphine / water / 0.5 h / 20 °C / Inert atmosphere 1.2: 16 h / 20 °C / Inert atmosphere 2.1: n-butyllithium / tetrahydrofuran; diethyl ether / 16 h / -100 - 20 °C / Inert atmosphere 3.1: trimethylsilyl trifluoromethanesulfonate; 4-tert-Butylcatechol; trans-di-O-tert-butyl hyponitrite; 2-methoxybenzo[d][1,3,2]dioxaborole / dichloromethane; benzene; methanol / 16 h / 70 °C / Inert atmosphere View Scheme

4-chloro-butyric acid ethyl ester (3153-36-4) + ethyl 2-(benzylamino)acetate (6436-90-4) → 4-[benzyl(ethoxycarbonylmethyl)amino]butyric acid ethyl ester (63876-32-4)

Conditions	Yield
With potassium carbonate In toluene for 8h; Solvent; Reflux; Large scale;	99.1%
With potassium carbonate In chloroform at 66 - 68℃; for 24h;

4-chloro-butyric acid ethyl ester (3153-36-4) + N,O-dimethylhydroxylamine*hydrochloride (6638-79-5) → N-Methyl-N-methoxy-4-chlorobutanamide (64214-66-0)

Conditions	Yield
With trimethylaluminum In hexane; dichloromethane for 24h; Ambient temperature;	99%
Stage #1: N,O-dimethylhydroxylamine*hydrochloride With dimethyl aluminium chloride In hexane; dichloromethane at 0 - 20℃; for 1h; Stage #2: 4-chloro-butyric acid ethyl ester In dichloromethane for 1h;	82%

4-chloro-butyric acid ethyl ester (3153-36-4) + 1-(3,4-dichloro)phenylpiperazine (57260-67-0) → ethyl 4-[4-(3,4-dichlorophenyl)piperazin-1-yl]butanoate (1061701-06-1)

Conditions	Yield
With cesium hydroxide; sodium iodide at 50℃; for 0.266667h; Microwave irradiation; Neat (no solvent); chemoselective reaction;	98%

4-chloro-butyric acid ethyl ester (3153-36-4) + 1-(2,5-dimethylphenyl)piperazine (1013-25-8) → ethyl 4-[4-(2,5-dimethylphenyl)piperazin-1-yl]butanoate (1061701-76-5)

Conditions	Yield
With cesium hydroxide; sodium iodide at 50℃; for 0.266667h; Microwave irradiation; Neat (no solvent); chemoselective reaction;	97%

4-chloro-butyric acid ethyl ester (3153-36-4) + 1-[3-(trifluoromethyl)phenyl]piperazine hydrochloride → ethyl 4-[4-(3-(trifluoromethyl)phenyl)piperazin-1-yl]butanoate (108786-32-9)

Conditions	Yield
With cesium hydroxide; sodium iodide at 50℃; for 0.266667h; Microwave irradiation; Neat (no solvent); chemoselective reaction;	97%

4-chloro-butyric acid ethyl ester (3153-36-4) + 5-nitroguaiacol (636-93-1) → ethyl 4-(2-methoxy-5-nitrophenoxy) butyrate (1093798-74-3)

Conditions	Yield
With potassium carbonate In N,N-dimethyl-formamide at 60℃;	96%
With potassium carbonate In N,N-dimethyl-formamide at 60℃;

4-chloro-butyric acid ethyl ester (3153-36-4) + 1,2,3-trimethoxybenzene (621-23-8) → 1-(4-chlorobutyl)-2,4,6-trimethoxybenzene

Conditions	Yield
With dimethylethylsilane; (μ3,η2,η3,η5-acenaphthylene)Ru3(CO)7 at 20℃; for 5h; Inert atmosphere; Neat (no solvent);	96%

4-chloro-butyric acid ethyl ester (3153-36-4) + octyl alpha-D-glucopyranoside (29781-80-4) → Octyl 6-O-4-chlorobutanoyl-α-D-glucopyranoside

Conditions	Yield
With zeolite CaA at 40℃; for 48h; SP 435 lipase;	95%
at 40℃; for 6h; Product distribution; lipase from Candida antarctica; other lipases, times; also in the presence of zeolite CaA;

4-chloro-butyric acid ethyl ester (3153-36-4) → ethyl 4-azidobutyrate (51453-79-3)

Conditions	Yield
With sodium azide; 15-crown-5 In acetonitrile for 12h; Heating;	95%

4-chloro-butyric acid ethyl ester (3153-36-4) + 1-(4-Fluorophenyl)piperazine (2252-63-3) → ethyl 4-<4-(4-fluorophenyl)-1-piperazinyl>butyrate (130933-88-9)

Conditions	Yield
With cesium hydroxide; sodium iodide at 50℃; for 0.266667h; Microwave irradiation; Neat (no solvent); chemoselective reaction;	95%

4-chloro-butyric acid ethyl ester (3153-36-4) + 1,8-Naphthalimide (81-83-4) → ethyl 4-(1,3-dioxo-2,3-dihydro-1H-benzo[d,e]isoquinolin-2-yl)butanoate (150705-10-5)

Conditions	Yield
With caesium carbonate; sodium iodide In N,N-dimethyl-formamide at 70℃; for 0.166667h; Microwave irradiation;	95%

4-Cyanochlorobenzene (623-03-0) + 4-chloro-butyric acid ethyl ester (3153-36-4) → 4-cyano-benzenebutanoic acid ethyl ester (131379-33-4)

Conditions	Yield
Stage #1: 4-chloro-butyric acid ethyl ester With tetrabutylammomium bromide; iodine; zinc In N,N-dimethyl acetamide at 80℃; for 12h; Stage #2: 4-Cyanochlorobenzene; bis(triphenylphosphine)nickel(II) chloride In N,N-dimethyl acetamide Further stages.;	94%

4-chloro-butyric acid ethyl ester (3153-36-4) + 2-methoxy-ethanol (109-86-4) → 2-methoxyethyl 4-chlorobutanoate

Conditions	Yield
With titanium(IV) isopropylate In toluene at 20℃; Dean-Stark;	94%

4-chloro-butyric acid ethyl ester (3153-36-4) + 1,3-dimethyl glycerol ether (623-69-8) → 1,3-dimethoxypropan-2-yl 4-chlorobutanoate

Conditions	Yield
With titanium(IV) isopropylate In toluene at 20℃; Dean-Stark;	94%

4-chloro-butyric acid ethyl ester (3153-36-4) → 4-chloro-1-butanol-1,1-d2 (66502-79-2)

Conditions	Yield
With lithium aluminium deuteride In diethyl ether -15 deg C -> 15 deg C; 15 deg C , 30 min;	93%
With lithium aluminium deuteride In diethyl ether at -10℃;

4-chloro-butyric acid ethyl ester (3153-36-4) + 7-methyl-3,3-diphenylindoline → ethyl 4-(7-methyl-3,3-diphenylindolin-1-yl)butanoate

Conditions	Yield
With potassium carbonate In N,N-dimethyl-formamide at 100℃; for 6h;	92%

4-chloro-butyric acid ethyl ester (3153-36-4) + 5-methoxy-2-(3-phenylisoxazol-5-yl)phenol (1186130-66-4) → ethyl 4-(5-methoxy-2-(3-phenylisoxazol-5-yl)phenoxy)butanoate (1186130-80-2)

Conditions	Yield
With potassium carbonate In acetone Williamson type O-alkylation; Reflux;	90.5%

4-chloro-butyric acid ethyl ester (3153-36-4) + 1,4-bis(piperazin-1-yl)-2,3,5,6-tetrafluorobenzene → 4-(4-{4-[4-(3-ethoxycarbonyl-propyl)-piperazin-1-yl]-2,3,5,6-tetrafluoro-phenyl}-piperazin-1-yl)-butyric acid ethyl ester

Conditions	Yield
With triethylamine In dimethyl sulfoxide Heating;	90%

4-chloro-butyric acid ethyl ester (3153-36-4) + 5,5'-dimethyl-2,2'-dipyridyl diselenide (496043-96-0) → ethyl 2-(5-methyl)pyridylselenobutanoate (1124321-70-5)

Conditions	Yield
Stage #1: 5,5'-dimethyl-2,2'-dipyridyl diselenide With sodium tetrahydroborate In ethanol Inert atmosphere; Stage #2: 4-chloro-butyric acid ethyl ester In ethanol at 10 - 20℃; for 0.25h; Inert atmosphere;	90%

4-chloro-butyric acid ethyl ester (3153-36-4) + diphenyl diselenide (1666-13-3) → ethyl 4-(phenylselanyl)butanoate (25059-06-7)

Conditions	Yield
Stage #1: diphenyl diselenide With sodium tetrahydroborate In ethanol for 0.166667h; Stage #2: 4-chloro-butyric acid ethyl ester In ethanol at 55 - 60℃; for 1.5h;	89%

4-chloro-butyric acid ethyl ester (3153-36-4) + 1-(2-phenylethyl)-1H-imidazole (49823-14-5) → 3-(4-ethoxy-4-oxobutyl)-1-phenethyl-1H-imidazol-3-ium chloride

Conditions	Yield
In toluene at 80℃; for 0.333333h; Microwave irradiation; Green chemistry;	89%

4-chloro-butyric acid ethyl ester (3153-36-4) + phthalimide (136918-14-4) → ethyl 4-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)butanoate (10294-97-0)

Conditions	Yield
With caesium carbonate; sodium iodide In N,N-dimethyl-formamide at 70℃; for 0.166667h; Microwave irradiation;	88%

4-chloro-butyric acid ethyl ester (3153-36-4) + bis(diphenylmethyl) diselenide (24572-14-3) → ethyl 2-(diphenyl)methylselenobutanoate (1124321-77-2)

Conditions	Yield
Stage #1: bis(diphenylmethyl) diselenide With sodium tetrahydroborate In ethanol Inert atmosphere; Stage #2: 4-chloro-butyric acid ethyl ester In ethanol at 15 - 20℃; for 0.416667h; Inert atmosphere;	87%

4-chloro-butyric acid ethyl ester (3153-36-4) + 1-chloro-3-methoxy-benzene (2845-89-8) → ethyl 4-(3'-methoxyphenyl)butyrate (57816-01-0)

Conditions	Yield
With nickel(II) bromide dimethoxyethane; pyridine-2,6-bis(N-cyanocarboxamidine); lithium chloride; zinc In 1-methyl-pyrrolidin-2-one at 80℃; for 24h; Catalytic behavior; Reagent/catalyst; Inert atmosphere;	87%

4-chloro-butyric acid ethyl ester (3153-36-4) + 3-hydroxy-1-isopropyl-5,6,7,8-tetrahydroisoquinoline-4-carbonitrile (371930-42-6) → ethyl 4-{[4-cyano-1-(propan-2-yl)-5,6,7,8-tetrahydroisoquinolin-3-yl]oxy}butanoate

Conditions	Yield
With potassium carbonate In N,N-dimethyl-formamide at 75 - 80℃; for 2h;	87%

4-chloro-butyric acid ethyl ester (3153-36-4) + ethylmagnesium bromide (925-90-6) → 1-(3-chloropropyl)cyclopropanol (174790-32-0)

Conditions	Yield
Stage #1: 4-chloro-butyric acid ethyl ester; ethylmagnesium bromide With titanium(IV) isopropylate In diethyl ether at 20℃; for 0.5h; Stage #2: With sulfuric acid In diethyl ether	86%
Stage #1: 4-chloro-butyric acid ethyl ester; ethylmagnesium bromide With titanium(IV) isopropylate In diethyl ether at 20℃; Kulinkovich Hydroxycyclopropanation; Stage #2: With sulfuric acid In diethyl ether	86%
With titanium(IV) isopropylate In diethyl ether Ambient temperature;	85%

4-chloro-butyric acid ethyl ester (3153-36-4) + 2,2'-dipyridyldiselenide (59957-75-4) → ethyl 2-pyridylselenobutanoate (1124321-67-0)

Conditions	Yield
Stage #1: 2,2'-dipyridyldiselenide With sodium tetrahydroborate In ethanol Inert atmosphere; Stage #2: 4-chloro-butyric acid ethyl ester In ethanol at 10 - 20℃; for 0.5h; Inert atmosphere;	86%

4-chloro-butyric acid ethyl ester (3153-36-4) + bis(2-naphthyl) diselenide (17932-23-9) → ethyl 2-naphthylselenobutanoate (23763-12-4)

Conditions	Yield
Stage #1: bis(2-naphthyl) diselenide With sodium tetrahydroborate In ethanol Inert atmosphere; Stage #2: 4-chloro-butyric acid ethyl ester In ethanol at 30 - 35℃; for 1.41667h; Inert atmosphere;	86%

4-chloro-butyric acid ethyl ester (3153-36-4) + 5-chloro-2-benzoxazolinone (95-25-0) → ethyl 4-(5-chloro-2(3H)-benzoxazolon-3-yl)butanoate (659724-36-4)

Conditions	Yield
Stage #1: 5-chloro-2-benzoxazolinone With sodium ethanolate In ethanol Stage #2: 4-chloro-butyric acid ethyl ester In N,N-dimethyl-formamide at 80℃; for 8h;	85%

4-chloro-butyric acid ethyl ester (3153-36-4) + 4-Fluorobenzyl bromide (459-46-1) + 3-(4-piperidinyl)-1H-indole (17403-09-7) → 4-{4-[1-(4-fluoro-benzyl)-1H-indol-3-yl]-piperidin-1-yl}-butyric acid

Conditions	Yield
	85%

Upstream product

• 123-91-1 1,4-dioxane 
• 14077-66-8 4-ethoxy-butyryl chloride 
• 64-17-5 ethanol 
• 28341-54-0 4-(4-nitrophenoxy)butanoic acid 
• 627-00-9 γ-chlorobutyric acid 
• 4635-59-0 4-Chlorobutanoyl chloride 
• 205995-80-8 5,11,17,23-tetra-tert-butyl-25,27-di(3-ethoxycarbonylpropoxy)-26,28-dihydroxycalix[4]arene 
• 140-88-5 ethyl acrylate 
• 302577-73-7 ethyl 3-(4,4,5,5,-tetramethyl-[1,3,2]dioxaborolan-2-yl)-propionate 
• 56-23-5 tetrachloromethane 
• 7791-25-5 sulfuryl dichloride 
• 105-54-4 butanoic acid ethyl ester 
• 94-36-0 dibenzoyl peroxide 
• 1191-95-3 cyclobutanone 

Downstream Products

• 63449-37-6 ethyl 4-<(2-ethoxy-2-oxoethyl)sulfanyl>butanoate 
• 7743-26-2 <γ-(ethoxycarbonyl)propyl>triphenylphosphonium iodide 
• 72338-57-9 ethyl 4-(imidazol-1-yl)butyrate 
• 98634-65-2 4-[8-Fluoro-5-(4-fluoro-phenyl)-1,3,4,5-tetrahydro-pyrido[4,3-b]indol-2-yl]-butyric acid ethyl ester 
• 7438-93-9 4-<2-Chlor-4-nitro-phenoxy>-buttersaeure 
• 26717-41-9 4-[2-(4-Bromo-phenoxy)-2-methyl-propionyloxy]-butyric acid ethyl ester 
• 29233-76-9 4-[2-(4-Chloro-phenoxy)-2-methyl-propionyloxy]-butyric acid ethyl ester 
• 18095-17-5 4-[2-(3,4-Dichloro-benzoylamino)-4-methyl-phenoxy]-butyric acid 
• 18095-22-2 4-[2-(3,4-Dichloro-benzoylamino)-phenoxy]-butyric acid 
• 18095-20-0 4-[4-Chloro-2-(3-trifluoromethyl-benzoylamino)-phenoxy]-butyric acid 
• 64214-66-0 N-Methyl-N-methoxy-4-chlorobutanamide 
• 28341-54-0 4-(4-nitrophenoxy)butanoic acid 
• 1759-53-1 cyclopropanecarboxylic acid 
• 131379-33-4 4-cyano-benzenebutanoic acid ethyl ester 

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