765-69-5

Basic information

• Product Name: 2-Methyl-1,3-cyclopentanedione
• Synonyms: 2-Methyl-1,3-cyclopentadione;2-METHYLCYCLOPENTAN-1,3-DIONE;2-METHYL-1,3-CYCLOPENTANEDIONE;METHYLCYCLE-D;2-Methylcyclopentane-1,3-dione,98%;1,3-Cyclopentanedione, 2-methyl-;2-METHYL-1,3-CYCLOPENTANEDIONE(METHYLCYCLO-D);2-Methyl-1,3-cyclopentanedione,98%
• CAS NO: 765-69-5
• Molecular Formula: C₆H₈O₂
• Molecular Weight: 112.13
• EINECS: 212-153-2
• Product Categories: Miscellaneous;ketone;C3 to C6;Carbonyl Compounds;Ketones
• Mol File: 765-69-5.mol
• Article Data: 14

Chemical Properties

• Melting Point: 212-215 °C(lit.)
• Boiling Point: 213°C (estimate)
• Flash Point: 78.5 °C
• Appearance: Light beige to tan/Crystalline Powder
• Density: 1.0795 (rough estimate)
• Vapor Pressure: 0.0392mmHg at 25°C
• Refractive Index: 1.4550 (estimate)
• Storage Temp.: Store below +30°C.
• Solubility: Solubility in hot Methanol (almost transparency).
• PKA: 10.83±0.20(Predicted)
• BRN: 1237255
• CAS DataBase Reference: 2-Methyl-1,3-cyclopentanedione(CAS DataBase Reference)
• NIST Chemistry Reference: 2-Methyl-1,3-cyclopentanedione(765-69-5)
• EPA Substance Registry System: 2-Methyl-1,3-cyclopentanedione(765-69-5)

Safety Data

• Hazard Codes: Xi
• Statements: 36/37/38
• Safety Statements: 22-24/25-36-26
• WGK Germany: 3
• Hazardous Substances Data: 765-69-5(Hazardous Substances Data)

Usage

Chemical Properties

LIGHT BEIGE TO TAN CRYSTALLINE POWDER

Uses

Different sources of media describe the Uses of 765-69-5 differently. You can refer to the following data:
1. 2-Methyl-1,3-cyclopentanedione was used as a reactant in the identification and characterization of benzil (diphenylethane-1,2-dione) analogues as inhibitors of mammalian carboxylesterases.
2. 2-Methyl-1,3-cyclopentanedione hs been used to explore deoxycholic acid (DCA) induced changes in cell signaling. DCA is a secondary bile acid implicated in numerous pathological conditions. It has also been used in the synthesis of (-)-curcumanolide A and (-)-curcumalactone by aldol-lactonization.

Synthesis Reference(s)

Synthetic Communications, 19, p. 373, 1989 DOI: 10.1080/00397918908050676

InChI:InChI=1/C6H8O2/c1-4-5(7)2-3-6(4)8/h7H,2-3H2,1H3

Synthetic route

Co{(N4C19H6(CH3)8)(CH2CH2COOC3H7)4(CH2COOC3H7)3}(CH2CHC(O)CH2CH2C(O))(1+) → 2-Methylcyclopentane-1,3-dione (765-69-5) + 1,4-Cyclohexanedione (637-88-7)

Conditions	Yield
In methanol Irradiation (UV/VIS); anaerobic irradiation 1h with visible light at 20°C; analyzing products by GLC;	A 69% B 19%
In water Irradiation (UV/VIS); anaerobic irradiation 1h with visible light in single-compartment vesicle of N,N-dihexadecyl-Nα-(6-(trimethylammonio)hexanoyl)-L-alaninamide bromide at 20°C; phosphate-borate buffer; analyzing products by GLC;	A 19% B 67%
In benzene Irradiation (UV/VIS); anaerobic irradiation 1h with visible light at 20°C; analyzing products by GLC;	A 57% B 28%

tert-Butyl peroxybenzoate (614-45-9) + 1,3-cyclopentadione (3859-41-4) → 2-Methylcyclopentane-1,3-dione (765-69-5)

Conditions	Yield
With acetic acid; copper(l) chloride at 120℃;	68%

succinic acid (110-15-6) + propionyl chloride (79-03-8) → 2-Methylcyclopentane-1,3-dione (765-69-5)

Conditions	Yield
Stage #1: succinic acid With aluminum (III) chloride; nitromethane at 20℃; for 1h; Inert atmosphere; Stage #2: propionyl chloride at 80℃; for 3h; Inert atmosphere;	63%
With aluminum oxide 1.) nitromethane, 2.) 80 deg C, 3 h; Multistep reaction;
Stage #1: succinic acid With aluminum (III) chloride In nitromethane for 3.5h; Reflux; Inert atmosphere; Stage #2: propionyl chloride In nitromethane for 2.5h; Reflux; Inert atmosphere;

3-methylcyclopentane-1,2,4-trione (4505-54-8) → 2-Methylcyclopentane-1,3-dione (765-69-5)

Conditions	Yield
With semicarbazide hydrochloride anschliessendes Erhitzen mit KOH in Aethylenglykol;

3-methylcyclopentane-1,2,4-trione (4505-54-8) → 2-Methylcyclopentane-1,3-dione (765-69-5) + 4-hydroxy-2-methyl-1,3-cyclopentanedione (4800-04-8)

Conditions	Yield
With ethanol; platinum Hydrogenation;
With ethanol; platinum

succinic acid anhydride (108-30-5) + propionyl chloride (79-03-8) → 2-Methylcyclopentane-1,3-dione (765-69-5)

Conditions	Yield
With aluminium trichloride; nitromethane 1.) heating, 2.) 80 deg C, 3 h; Yield given. Multistep reaction;

2-(1-ethoxy-ethyl)-2-trimethylsilanyloxy-cyclobutanone (125113-32-8) → 2-Methylcyclopentane-1,3-dione (765-69-5)

Conditions	Yield
With Nafion-H; trifluoroacetic acid at 85℃; for 10h; Yield given;

2-(Diphenylmethyl)-2-methyl-1,3-cyclopentandion → 2-Methylcyclopentane-1,3-dione (765-69-5) + Diphenylmethane (101-81-5)

Conditions	Yield
With 9,10-dihydroanthracene In 1,3,5-trimethyl-benzene at 221℃; Kinetics; Rate constant; different temperatures; ΔG(excit.)300, ΔH(excit.), ΔS(excit.);	A n/a B 75 % Chromat.

2-Fluorenyl-2-methyl-1,3-cyclopentandion → 2-Methylcyclopentane-1,3-dione (765-69-5) + 9H-fluorene (86-73-7)

Conditions	Yield
With 9,10-dihydroanthracene In 1,3,5-trimethyl-benzene at 221℃; Kinetics; Rate constant; different temperatures; ΔG(excit.)300, ΔH(excit.), ΔS(excit.);	A n/a B 82 % Chromat.

C<*>OCH2CH2COC<*>HCH2-Cob(III)7C3-ester (1) → 2-Methylcyclopentane-1,3-dione (765-69-5) + 1,4-Cyclohexanedione (637-88-7)

Conditions	Yield
N+C5Ala2C16 vesicle at 20℃; Irradiation; in aqueous phosphate-borate buffer;	A 19 % Chromat. B 67 % Chromat.
In methanol at 20℃; Irradiation;	A 69 % Chromat. B 19 % Chromat.

1,2-bis(trimethylsiloxy)cyclobutene (17082-61-0) + 1,1-dimethoxyethane (534-15-6) → 2-Methylcyclopentane-1,3-dione (765-69-5)

Conditions	Yield
Stage #1: 1,2-bis(trimethylsiloxy)cyclobutene; 1,1-dimethoxyethane With boron trifluoride diethyl etherate In dichloromethane at -78 - 20℃; for 4h; Stage #2: With trifluoroacetic acid for 24h; Heating; Further stages.;

(3-methyl-2,4,5-trioxo-cyclopentyl)-glyoxylic acid ethyl ester (781-38-4) → 2-Methylcyclopentane-1,3-dione (765-69-5)

Conditions	Yield
Multi-step reaction with 2 steps 1: aqueous phosphoric acid 2: water containing ethanol; platinum View Scheme

C6H10N2O2 (393125-77-4) → 2-Methylcyclopentane-1,3-dione (765-69-5)

Conditions	Yield
With gold(III) tribromide; dimethylglyoxal In ethanol; water at 20℃; for 15h; pH=7;	100 %Spectr.

1,3-cyclopentadione (3859-41-4) + acetaldehyde (75-07-0) → 2-Methylcyclopentane-1,3-dione (765-69-5)

Conditions	Yield
With diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate; rac-Pro-OH In ethanol at 25℃;

2-Methylcyclopentane-1,3-dione (765-69-5) + 2-methyl-propan-1-ol (78-83-1) → 3-isobutoxy-2-methyl-2-cyclopenten-1-one (22117-97-1)

Conditions	Yield
With toluene-4-sulfonic acid In benzene for 16h; Heating;	100%
With toluene-4-sulfonic acid	100%
With toluene-4-sulfonic acid In benzene for 8h; Heating;	99%

2-Methylcyclopentane-1,3-dione (765-69-5) + methyl vinyl ketone (78-94-4) → 2-methyl-2-(3-oxobutyl)-1,3-cyclopentanedione (25112-78-1)

Conditions	Yield
With triethylamine In acetonitrile at 20℃;	100%
With acetic acid In water at 75℃; for 4h;	98%
With triethylamine In dichloromethane for 12h;	95%

diazomethane (186581-53-3, 908094-01-9) + 2-Methylcyclopentane-1,3-dione (765-69-5) → 3-methoxy-2-methylcyclopent-2-enone (3883-56-5)

Conditions	Yield
In diethyl ether	100%

2-Methylcyclopentane-1,3-dione (765-69-5) + 4-penten-3-one (1629-58-9) → 2-(3-oxopentyl)-2-methylcyclopentane-1,3-diones (34927-37-2)

Conditions	Yield
With acetic acid; hydroquinone In water at 75℃;	100%
With triethylamine In ethyl acetate for 120h;	90%
With triethylamine In ethyl acetate at 25℃; for 12h;	89%

2-Methylcyclopentane-1,3-dione (765-69-5) + acrolein (107-02-8) → 2-methyl-2-(2-formylethyl)-1,3-cyclopentanedione (66976-99-6)

Conditions	Yield
In water Ambient temperature;	100%
In water at 20℃; for 18h;	100%
In water at 20℃; for 18h; Inert atmosphere;	100%

2-Methylcyclopentane-1,3-dione (765-69-5) + 1-iodo-5-hexyne (2468-56-6) → C12H16O2 (1215086-43-3)

Conditions	Yield
With tetrabutyl ammonium fluoride In tetrahydrofuran	100%

2-Methylcyclopentane-1,3-dione (765-69-5) + dimethyl sulfate (77-78-1) → 3-methoxy-2-methylcyclopent-2-enone (3883-56-5)

Conditions	Yield
With potassium carbonate In acetone for 8h; Reflux;	99%
With potassium carbonate In acetone at 20 - 60℃; for 8h;	95%
With potassium carbonate In acetone at 20℃; for 4h; Reflux;

2-Methylcyclopentane-1,3-dione (765-69-5) + 1'-Hydroxymethyleugenol (31706-95-3) → 2-(3',4'-dimethoxycinnamyl)-2-methylcyclopentane-1,3-dione (160514-96-5)

Conditions	Yield
With tetrakis(triphenylphosphine) palladium(0) In tetrahydrofuran for 0.5h; Product distribution; Heating; further solvents and catalysts;	98.6%
With tetrakis(triphenylphosphine) palladium(0) In tetrahydrofuran for 0.5h; Heating;	98.6%

2-Methylcyclopentane-1,3-dione (765-69-5) + 1,1,1,3,3,3-hexamethyl-disilazane (999-97-3) → 2-methyl-3-(trimethylsilyloxy)cyclopent-2-enone (84348-14-1)

Conditions	Yield
With 1H-imidazole at 120℃; for 2h; Neat (no solvent);	98%
With 1H-imidazole Heating;
With 1H-imidazole at 20 - 130℃; for 3h; Inert atmosphere;

2-Methylcyclopentane-1,3-dione (765-69-5) + allyl alcohol (107-18-6) → 2-allyl-2-methyl-1,3-cyclopentanedione (26828-48-8)

Conditions	Yield
With Ru(Cp*)(η3-C3H5)(p-CH3C6H5SO3)2 In dichloromethane; acetonitrile at 50℃; for 3h; regioselective reaction;	98%
With tetrakis(triphenylphosphine) palladium(0); carbon dioxide In dichloromethane under 15200 Torr; for 24h; Ambient temperature;	65%

2-Methylcyclopentane-1,3-dione (765-69-5) + (4-hydroxyphenyl)methanol (623-05-2) → 2-(4-hydroxybenzyl)-2-methyl-1,3-cyclopentanedione (112621-27-9)

Conditions	Yield
In water at 80℃; for 12h;	97%

2-Methylcyclopentane-1,3-dione (765-69-5) + 1,1-dimethylhydrazine (57-14-7) → 2-methyl-1,3-cyclopentanedione-dimethylhydrazone (124015-86-7)

Conditions	Yield
for 4h; Heating;	97%
With toluene-4-sulfonic acid In benzene Heating;	96%

2-Methylcyclopentane-1,3-dione (765-69-5) + (E)-3-(trimethylsilyl)-2-propenyl acetate (86422-21-1) → 2-Methyl-2-((E)-3-trimethylsilanyl-allyl)-cyclopentane-1,3-dione (147974-05-8)

Conditions	Yield
With 1,8-diazabicyclo[5.4.0]undec-7-ene; tetrakis(triphenylphosphine) palladium(0) In tetrahydrofuran for 34h; Ambient temperature;	96%

2-Methylcyclopentane-1,3-dione (765-69-5) → 3-iodo-2-methyl-2-cyclopentenone (56778-49-5)

Conditions	Yield
With iodine; triethylamine; triphenylphosphine In acetonitrile at 80 - 90℃; for 6h;	96%
With triphenylphosphine diiodide	92%
With triphenylphosphine diiodide; triethylamine In acetonitrile for 3h; Heating;	92%

2-Methylcyclopentane-1,3-dione (765-69-5) + 1-(4-methoxylphenyl)-2-propen-1-ol (51410-44-7) → 2-[(E)-3-(4-Methoxy-phenyl)-allyl]-2-methyl-cyclopentane-1,3-dione

Conditions	Yield
With tetrakis(triphenylphosphine) palladium(0) In tetrahydrofuran Heating;	95.4%

2-Methylcyclopentane-1,3-dione (765-69-5) + methyl vinyl ketone (78-94-4) → (+/-)-7a-methyl-2,3,7,7a,tetrahydro-1H-indene-1,5(6H)-dione (19576-08-0)

Conditions	Yield
With lipase from porcine pancreas In methanol; water Robinson Annulation; Green chemistry; Enzymatic reaction;	95%
Stage #1: 2-Methylcyclopentane-1,3-dione; methyl vinyl ketone With aluminum oxide at 20℃; for 0.166667h; Michael addition; Stage #2: With pyrrolidine for 0.05h; Robinson annulation; microwave irradiation;	45%
With pyridine; toluene; tert-butyl alcohol Erhitzen des Reaktionsprodukts mit Essigsaeure und Toluol-4-sulfonsaeure;
With triethylamine In ethyl acetate

2-Methylcyclopentane-1,3-dione (765-69-5) + 4,10-bisthia-1,2,3,4,9,10-hexahydrophenanthrenylideneethylisothiuroniumacetate (78500-02-4) → 8,14-seco-1,6-dithiabenz<3,4>estra-3,5(10),9(11)-triene-14,17-dione (78500-03-5)

Conditions	Yield
In diethyl ether; water Ambient temperature; two phase system;	95%
In diethyl ether; water for 6h;	95%

2-Methylcyclopentane-1,3-dione (765-69-5) + 2-(diethoxyphosphoryl)acrylic acid di(cyclohexylamine) salt → 2-(Diethoxy-phosphoryl)-3-(1-methyl-2,5-dioxo-cyclopentyl)-propionic acid; compound with dicyclohexyl-amine

Conditions	Yield
In benzene at 25℃; for 48h;	95%

2-Methylcyclopentane-1,3-dione (765-69-5) + trifluoromethylsulfonic anhydride (358-23-6) → trifluoromethanesulfonic acid 2-methyl-3-oxocyclopent-1-enyl ester (134050-29-6)

Conditions	Yield
With N-ethyl-N,N-diisopropylamine In dichloromethane at -78 - -40℃; for 1h;	95%
With pyridine In dichloromethane at -78 - 20℃; Inert atmosphere;	92%
Stage #1: 2-Methylcyclopentane-1,3-dione With N-ethyl-N,N-diisopropylamine In dichloromethane at -78℃; for 0.166667h; Sealed tube; Inert atmosphere; Stage #2: trifluoromethylsulfonic anhydride In dichloromethane at -78℃; for 1h; Sealed tube; Inert atmosphere;	92%
With 2,6-dimethylpyridine In dichloromethane at -78 - 20℃; for 1.5h;

2-Methylcyclopentane-1,3-dione (765-69-5) + homoalylic alcohol (627-27-0) → 3-but-3-enyloxy-2-methyl-cyclopent-2-enone (1116036-47-5)

Conditions	Yield
With toluene-4-sulfonic acid In toluene for 12h; Reflux;	95%

maleiimide (541-59-3) + 2-Methylcyclopentane-1,3-dione (765-69-5) + Isopropenyl acetate (108-22-5) → 1,8-diacetoxy-9-methyl-4-azatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione

Conditions	Yield
With toluene-4-sulfonic acid for 14h; Diels-Alder Cycloaddition; Reflux;	95%

2-Methylcyclopentane-1,3-dione (765-69-5) + 4-Nitrobenzenesulfonyl chloride (98-74-8) → 2-methyl-3-oxocyclopent-1-en-1-yl 4-nitrobenzenesulfonate

Conditions	Yield
With potassium carbonate In acetonitrile at 30℃; for 0.5h; Reagent/catalyst; Solvent; Temperature; Inert atmosphere;	95%

2-Methylcyclopentane-1,3-dione (765-69-5) → 3-chloro-2-methylcyclopent-2-en-1-one (35173-23-0)

Conditions	Yield
With oxalyl dichloride; N,N-dimethyl-formamide In dichloromethane 0 deg C, 5 min, then to room temp., 30 min;	94%
With triethylamine; dichlorotriphenylphosphorane In benzene for 4h; Ambient temperature;	92%
With lithium hydride; O-phenyl phosphorodichloridate; lithium chloride In tetrahydrofuran for 2h; Ambient temperature;	83%

2-Methylcyclopentane-1,3-dione (765-69-5) + Allyl acetate (591-87-7) → 2-allyl-2-methyl-1,3-cyclopentanedione (26828-48-8)

Conditions	Yield
With tetrakis(triphenylphosphine) palladium(0) In methanol Heating;	94%
tetrakis(triphenylphosphine) palladium(0) In tetrahydrofuran at 25℃;	94%
tetrakis(triphenylphosphine) palladium(0) In tetrahydrofuran for 72h;	76%

2-Methylcyclopentane-1,3-dione (765-69-5) + 6-(2-benzyloxy-3-methoxyphenyl)-1-hexen-3-one (131943-93-6) → (+/-)-2-<6-(2-benzyloxy-3-methoxyphenyl)-3-oxohexyl>-2-methylcyclopentane-1,3-dione (131943-94-7)

Conditions	Yield
With triethylamine In ethyl acetate for 36h; Ambient temperature;	94%

2-Methylcyclopentane-1,3-dione (765-69-5) → 2-bromo-2-methylcyclopentane-1,3-dione (3883-60-1)

Conditions	Yield
Stage #1: 2-Methylcyclopentane-1,3-dione With magnesium(II) perchlorate at 0 - 5℃; for 0.0833333h; Stage #2: With N-bromosaccharin at 0 - 5℃;	94%
With bromine; triethylamine In ethyl acetate at 80℃; for 1h;
With methanol; tetraethylammonium bromide; Dess-Martin periodane In chloroform at 20℃; for 0.0833333h;

2-Methylcyclopentane-1,3-dione (765-69-5) + 1,2-propanediene (463-49-0) + 6-methoxy-3,4-dihydronaphthalene-1-yl triflate (115375-59-2) → 2-<2-(6-methoxy-3,4-dihydronaphthalen-1-yl)prop-2-ene-1-yl>-2-methylcyclopentane-1,3-dione (57346-12-0) + 1-isopropenyl-6-methoxynaphthalene + 2-Methyl-2-(3-methyl-2-methylene-but-3-enyl)-cyclopentane-1,3-dione (183194-89-0)

Conditions	Yield
With sodium hydride; triphenylphosphine; lithium chloride; bis(dibenzylideneacetone)-palladium(0) In dimethyl sulfoxide at 65℃; for 76h;	A 94% B 5% C 16%

2-Methylcyclopentane-1,3-dione (765-69-5) + methyl iodide (74-88-4) → 2,2-dimethylcyclopentane-1,3-dione (3883-58-7)

Conditions	Yield
Stage #1: 2-Methylcyclopentane-1,3-dione; methyl iodide With potassium hydroxide In 1,4-dioxane; water Heating / reflux; Stage #2: With hydrogenchloride In water at 120℃; for 0.25h;	93%
With potassium hydroxide In 1,4-dioxane; water at 20℃; Reflux;	93%
With potassium hydroxide In 1,4-dioxane; water Reflux;	68%

1,1-Diphenylethylene (530-48-3) + 2-Methylcyclopentane-1,3-dione (765-69-5) → benzophenone (119-61-9) + 1-hydroxy-6-methyl-4,4-diphenyl-2,3-dioxabicyclo<4.3.0>nonan-7-one (142605-75-2)

Conditions	Yield
With oxygen; manganese(II) acetate In acetic acid at 23℃; for 15h;	A 5% B 93%

2-Methylcyclopentane-1,3-dione (765-69-5) → 3-Bromo-2-methylcyclopent-2-en-1-one (56671-87-5)

Conditions	Yield
With triethylamine; dibromotriphenylphosphorane In benzene for 4h; Ambient temperature;	93%
With Oxalyl bromide; N,N-dimethyl-formamide In dichloromethane 0 deg C, 5 min, then to room temp., 30 min;	88%
With Oxalyl bromide; N,N-dimethyl-formamide In dichloromethane at 0 - 20℃; for 4.25h; Inert atmosphere;	83%

Upstream product

• 4505-54-8 3-methylcyclopentane-1,2,4-trione 
• 110-15-6 succinic acid 
• 79-03-8 propionyl chloride 
• 3859-41-4 1,3-cyclopentadione 
• 75-07-0 acetaldehyde 
• 614-45-9 tert-Butyl peroxybenzoate 
• 393125-77-4 C₆H₁₀N₂O₂ 
• 781-38-4 (3-methyl-2,4,5-trioxo-cyclopentyl)-glyoxylic acid ethyl ester 
• 17082-61-0 1,2-bis(trimethylsiloxy)cyclobutene 
• 534-15-6 1,1-dimethoxyethane 
• 160731-87-3 2-(Diphenylmethyl)-2-methyl-1,3-cyclopentandion 
• 125113-32-8 2-(1-ethoxy-ethyl)-2-trimethylsilanyloxy-cyclobutanone 
• 108-30-5 succinic acid anhydride 

Downstream Products

• 25112-78-1 2-methyl-2-(3-oxobutyl)-1,3-cyclopentanedione 
• 19576-08-0 (+/-)-7a-methyl-2,3,7,7a,tetrahydro-1H-indene-1,5(6H)-dione 
• 3883-58-7 2,2-dimethylcyclopentane-1,3-dione 
• 113893-96-2 1-methoxy-5-methyl-6-oxo-3-phenyl-2-oxabicyclo<3.3.0>octane 
• 111950-24-4 1-hydroxy-6-methyl-7-oxo-4-phenyl-2,3-dioxabicyclo<4.3.0>nonane 
• 113974-17-7 1-hydroxy-5-methyl-6-oxo-3-phenyl-2-oxabicyclo<3.3.0>octane 
• 77630-19-4 2-Methyl-2-(phenylselenenyl)cyclopentane-1,3-dione 
• 69994-31-6 2-methyl-2-phenemethylcyclopentane-1,3-dione 
• 83179-62-8 3-(benzyloxy)-2-methylcyclopent-2-en-1-one 
• 26828-48-8 2-allyl-2-methyl-1,3-cyclopentanedione 
• 83179-60-6 3-allyloxy-2-methylcyclopent-2-en-1-one 
• 5830-73-9 methyl 3-(1-methyl-2,5-dioxocyclopentyl)propanoate 
• 84636-84-0 2-(2-Methyl-3-oxo-cyclopenten-1-yloxy)-N-(p-tolyl)acetamide 
• 134622-65-4 3-(benzylamino)-2-methylcyclopent-2-en-1-one 

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