870-23-5

Basic information

• Product Name: Allyl mercaptan
• Synonyms: 2-propenyl mercaptan;CH2=CHCH2SH;mercaptanallylique;propenemercaptan;ALLYLTHIOL;ALLYL SULFHYDRATE;ALLYL MERCAPTAN;2-PROPEN-1-THIOL
• CAS NO: 870-23-5
• Molecular Formula: C₃H₆S
• Molecular Weight: 74.14
• EINECS: 212-792-7
• Product Categories: API intermediates;thiol Flavor;Building Blocks;Chemical Synthesis;Organic Building Blocks;Sulfur Compounds;Thiols/Mercaptans
• Mol File: 870-23-5.mol
• Article Data: 20

Chemical Properties

• Melting Point: 175-176 °C(Solv: benzene (71-43-2))
• Boiling Point: 67-68 °C(lit.)
• Flash Point: 18 °C
• Appearance: Clear colorless to light yellow/Liquid
• Density: 0.898 g/mL at 25 °C(lit.)
• Vapor Pressure: 152mmHg at 25°C
• Refractive Index: n20/D 1.4765(lit.)
• Storage Temp.: −20°C
• Solubility: Not miscible or difficult to mix.
• PKA: 9.83±0.10(Predicted)
• Sensitive: Air Sensitive
• Stability: Stable, but highly flammable. Incompatible with strong bases, strong oxidizing agents, reactive metals.
• BRN: 1697523
• CAS DataBase Reference: Allyl mercaptan(CAS DataBase Reference)
• NIST Chemistry Reference: Allyl mercaptan(870-23-5)
• EPA Substance Registry System: Allyl mercaptan(870-23-5)

Safety Data

• Hazard Codes: F
• Statements: 11
• Safety Statements: 16-33-9
• RIDADR: UN 1228 3/PG 2
• WGK Germany: 3
• F: 10-13-23
• TSCA: Yes
• HazardClass: 3
• PackingGroup: II
• Hazardous Substances Data: 870-23-5(Hazardous Substances Data)

Usage

Chemical Properties

Different sources of media describe the Chemical Properties of 870-23-5 differently. You can refer to the following data:
1. colourless to faintly yellow-brown liquid
2. A colorless liquid with strong garlic odor. Used as a flavor enhancer, flavoring agent or adjuvant

Occurrence

Reported found in onion, garlic and caucas (Allium victoralis L.).

Uses

Different sources of media describe the Uses of 870-23-5 differently. You can refer to the following data:
1. Allyl mercaptan is an important raw material and intermediate used in organic synthesis, pharmaceuticals agrochemicals and dyestuff fields.
2. Allyl Mercaptan is a synthetic flavoring agent that is a stable, color- less liquid of garlic-like odor. it should be stored in glass or tin con- tainers. it is used in artificial garlic flavors for application in condiments at 3 ppm, and in baked goods at 2 ppm. it is also termed 2 propylene-1 thiol.

Safety Profile

Poison by inhalation and ingestion. Strong irritant to skin and mucous membranes. When heated to decomposition it emits highly toxic fumes of SO,. Very dangerous fire hazard. To fight fire, use water mist or spray, alcohol foam, Con, or dry chemical. See also ALLYL COMPOUNDS and MERCAPTANS

InChI:InChI=1/C3H6S/c1-2-3-4/h2,4H,1,3H2

Synthetic route

diallyl disulphide (2179-57-9) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With indium; ammonium chloride In ethanol for 1h; Reduction; Heating;	95%
With magnesium In methanol; benzene for 1.66667h; Ambient temperature;	83%

3-chloroprop-1-ene (107-05-1) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With sodium hydrogen sulfide monohydrate; diallyl disulphide; N-benzyl-N,N,N-triethylammonium chloride In water; xylene at -2 - 40℃; for 10h; Product distribution / selectivity; Inert atmosphere;	94.19%
With hydrogenchloride; sodium hydrogen sulfide; tetrabutylammomium bromide In water; toluene at 40℃; for 3h; pH=9.5; Solvent; Reagent/catalyst;	91.3%
With sodium hydrogen sulfide monohydrate; N-benzyl-N,N,N-triethylammonium chloride In water; xylene at -2 - 40℃; for 10h; Inert atmosphere;	83.92%
With hydrosulfide anion In gas Thermodynamic data; reaction efficiency;

S-allyl ethanethioate (23973-51-5) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With sodium methylate In methanol at 0℃; for 0.333333h;	94%
With sodium hydroxide In acetone Ambient temperature;
Stage #1: S-allyl ethanethioate With methanol; sodium methylate at 0℃; for 0.333333h; Stage #2: pH=7;	94 %Spectr.

allyl iodid (556-56-9) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With potassium hydrosulfide

dithiocarbamic acid allyl ester (50586-78-2) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With sodium hydroxide

S-allyl-N,N'-diphenyl-isothiourea (127040-65-7) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
beim Erhitzen ueber den Schmelzpunkt;

allyl alcohol (107-18-6) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With hydrogen sulfide; thorium dioxide at 300 - 360℃;

allyl bromide (106-95-6) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With ethanol; potassium hydrosulfide
With thiourea In ethanol for 1h; Substitution; Heating;
With thiourea In ethanol for 1h; Heating;
With sodium hydrogensulfide In dichloromethane
With sodium hydrogensulfide In dichloromethane

thiourea (17356-08-0) + 3-chloroprop-1-ene (107-05-1) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With water durch anschliessendes Verseifen des Reaktionsprodukts mit siedender 5n-Natronlauge;

S allyl S-methyl dithiocarbonate (40515-45-5) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With ethanolamine

1-Allyl-2-methylsulfanyl-4,6-diphenyl-pyridinium; iodide (83318-98-3) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With sodium hydroxide; thiourea 1.) 130 deg C, 0.5 h; 2.) reflux, 3 h; Yield given. Multistep reaction;

4-allylsulfanyl-cyclopentene (223113-51-7) → prop-2-ene-1-thiol (870-23-5) + cyclopenta-1,3-diene (542-92-7) + cyclopent-2-enethione (201139-68-6) + cyclopent-3-enethione

Conditions	Yield
at 700℃; under 8E-06 Torr; flash vacuum thermolysis; Further byproducts given;

4-allylsulfanyl-cyclohexene (223113-55-1) → prop-2-ene-1-thiol (870-23-5) + cyclohexa-1,3-diene (1165952-91-9) + cyclohex-3-enethione + benzene (71-43-2)

Conditions	Yield
at 700℃; under 8E-06 Torr; flash vacuum thermolysis; Further byproducts given;

trimethylene oxide (503-30-0) + hydrogen sulfide (7783-06-4) + aluminium oxide → 1-thiopropane (107-03-9) + prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
at 250℃;

glycerol (56-81-5) + sulfur → prop-2-ene-1-thiol (870-23-5) + ethene (74-85-1) + carbon dioxide (124-38-9) + hydrogen sulfide (7783-06-4)

Conditions	Yield
at 300℃; Produkt5:Diallylhexasulfid;

hydrogenchloride (7647-01-0) + allyl thiocyanate (764-49-8) + zinc → prop-2-ene-1-thiol (870-23-5) + hydrogen cyanide (74-90-8)

diallyl disulphide (2179-57-9) + water (7732-18-5) → prop-2-ene-1-thiol (870-23-5) + allylmethyl sulfide (10152-76-8)

Conditions	Yield
unter der Einw. von Penicillium brevicaule;

diallyl sulphide (592-88-1) + ammonium chloride + ammonia (7664-41-7) + lithium → prop-2-ene-1-thiol (870-23-5) + hydrogen sulfide (7783-06-4)

diallyl sulphide (592-88-1) + ammonia (7664-41-7) + lithium + ammonium sulfate → prop-2-ene-1-thiol (870-23-5) + hydrogen sulfide (7783-06-4)

diallyl sulphide (592-88-1) + ammonium chloride + ammonia (7664-41-7) + sodium → prop-2-ene-1-thiol (870-23-5) + hydrogen sulfide (7783-06-4)

diallyl sulphide (592-88-1) + ammonia (7664-41-7) + sodium + ammonium sulfate → prop-2-ene-1-thiol (870-23-5) + hydrogen sulfide (7783-06-4)

hydrogenchloride (7647-01-0) + diallyl sulphide (592-88-1) + tin → prop-2-ene-1-thiol (870-23-5) + hydrogen sulfide (7783-06-4)

allyl thiocyanate (764-49-8) + potassium hydrosulfide → prop-2-ene-1-thiol (870-23-5) + potassium thioacyanate (333-20-0)

di(prop-2-enyl) trithiocarbonate (52894-43-6) + ammonia (7664-41-7) → prop-2-ene-1-thiol (870-23-5) + ammonium thiocyanate (1147550-11-5)

(2R)-2-(acetylamino)-3-(prop-2-en-1-ylsulfanyl)propanoic acid (23127-41-5) + 2n-NaOH → prop-2-ene-1-thiol (870-23-5) + ammonia (7664-41-7) + acetic acid (64-19-7) + 2-oxo-propionic acid (127-17-3)

Conditions	Yield
beim Kochen;

α-bromomethylthiirane (31207-14-4) → prop-2-ene-1-thiol (870-23-5)

Conditions	Yield
With tri-n-butyl-tin hydride In benzene-d6 at 60℃; Kinetics;

C6H10S2Te + methylthiol (74-93-1) → prop-2-ene-1-thiol (870-23-5) + tellurium(II) dimethanethiolate (239135-41-2)

Conditions	Yield
With pyridine In benzene-d6 Equilibrium constant;

1,2-propanediene (463-49-0) + hydrogen sulfide (7783-06-4) → 1.3-propanedithiol (109-80-8) + prop-2-ene-1-thiol (870-23-5) + diallyl sulphide (592-88-1)

Conditions	Yield
byproducts: oligomers of CH2=CHCH2SH; other Radiation; at -70°C with initiator and radiation;

Allyl glycidyl ether (106-92-3) + prop-2-ene-1-thiol (870-23-5) → 1-allyloxy-3-(allylthio)propan-2-ol (401479-52-5)

Conditions	Yield
With potassium hydroxide In methanol at 20℃; for 1h;	100%
With 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene on polystyrene.HL at 30℃; for 0.5h;	90%

prop-2-ene-1-thiol (870-23-5) → diallyl disulphide (2179-57-9)

Conditions	Yield
With nanophase manganese (VII) oxide coated clay (NM7O coated clay) In toluene at 40℃; for 3h;	99%
With water; dihydrogen peroxide In various solvent(s) at 20℃; for 0.166667h; Oxidation; Dimerization;	94%
CoCl2 In acetonitrile Ambient temperature;	90%

prop-2-ene-1-thiol (870-23-5) + 4-methylhexa-2,3-dienenitrile (2861-05-4) → (Z)-3-Allylsulfanyl-4-methyl-hex-2-enenitrile (93195-00-7, 93195-01-8)

Conditions	Yield
With sodium ethanolate In ethanol for 1h; Heating;	99%

prop-2-ene-1-thiol (870-23-5) + (E)-3-methyl-4-nitrobut-3-ene-2-one (149795-00-6) → 3-Allylsulfanyl-3-methyl-4-nitro-butan-2-one (190784-98-6)

Conditions	Yield
With triethylamine In acetonitrile for 1h;	99%

cyclohexenone (930-68-7) + prop-2-ene-1-thiol (870-23-5) → 3-allylsulfanyl-cyclohexanone

Conditions	Yield
With air; ammonium cerium(IV) nitrate at 20℃; for 0.333333h;	99%
With iodine at 0℃; for 0.0833333h; Michael addition;	95%
iron(III) chloride at 20℃; for 0.0833333h;	93%
With C33H43FeN4O2S In pentane at 60℃; for 18h;	79%

prop-2-ene-1-thiol (870-23-5) + 3-ethynyl-2-thiophenecarboxaldehyde (221103-69-1) → C13H14S3

Conditions	Yield
With boron trifluoride diethyl etherate In acetic acid; toluene at 0℃; for 0.0833333h;	99%

prop-2-ene-1-thiol (870-23-5) + (E)-5-Nitro-4-propylpent-4-en-3-one → 4-Allylsulfanyl-4-nitromethyl-heptan-3-one (190785-02-5)

Conditions	Yield
With triethylamine In acetonitrile for 1h;	98%

prop-2-ene-1-thiol (870-23-5) + (E)-2-nitromethylene cycloheptanone (155990-69-5) → 2-Allylsulfanyl-2-nitromethyl-cycloheptanone (190785-04-7)

Conditions	Yield
With triethylamine In acetonitrile for 1h;	98%

prop-2-ene-1-thiol (870-23-5) + n-octanoic acid chloride (111-64-8) → allyl thiooctanoate

Conditions	Yield
Stage #1: n-octanoic acid chloride With triethylamine In cyclohexane at 0℃; for 0.5h; Inert atmosphere; Stage #2: prop-2-ene-1-thiol In cyclohexane at 0℃; for 2.5h; Time; Inert atmosphere;	98%

((1RS,2SR)-2-(2-(tert-butyldiphenylsilanyloxy)-1-hydroxyethyl)but-3-enyl)-2,4,6-triisopropylbenzenesulfonate + prop-2-ene-1-thiol (870-23-5) → (2RS,3RS)-3-((allylthio)methyl)-1-(tert-butyldiphenylsilanyloxy)pent-4-en-2-ol

Conditions	Yield
With 1,8-diazabicyclo[5.4.0]undec-7-ene at 20℃; for 6h;	97%
With 1,8-diazabicyclo[5.4.0]undec-7-ene at 20℃; for 2h; Inert atmosphere;	77%

prop-2-ene-1-thiol (870-23-5) + 3-crotonoyl-1,3-oxazolidin-2-one (123492-60-4) → 3-(3-(allylthio)butanoyl)oxazolidin-2-one

Conditions	Yield
With C43H36F6N4OS In chloroform at -20℃; for 72h; optical yield given as %ee; enantioselective reaction;	97%

prop-2-ene-1-thiol (870-23-5) + 3-(4-(3-(allyloxy)prop-1-ynyl)phenyl)prop-2-ynyl 4-methylbenzenesulfonate (1326218-67-0) → allyl(3-(4-(3-(allyloxy)prop-1-ynyl)phenyl)prop-2-ynyl)sulfane (1326218-18-1)

Conditions	Yield
Stage #1: prop-2-ene-1-thiol With sodium hydride In tetrahydrofuran at 0℃; for 1h; Stage #2: 3-(4-(3-(allyloxy)prop-1-ynyl)phenyl)prop-2-ynyl 4-methylbenzenesulfonate In tetrahydrofuran at 0 - 20℃; for 1h;	97%

prop-2-ene-1-thiol (870-23-5) + (Z)-2,2,2-trifluoro-N-(3-oxo-3-(2-oxooxazolidin-3-yl)-1-phenylprop-1-en-2-yl)acetamide (1412450-31-7) → N-(1-(allylthio)-3-oxo-3-(2-oxooxazolidin-3-yl)-1-phenylpropan-2-yl)-2,2,2-trifluoroacetamide

Conditions	Yield
With C43H36F6N4OS In dichloromethane at 20℃; for 8h; Optical yield = 86 %ee; stereoselective reaction;	97%
With triethylamine In dichloromethane at 20℃; for 24h; Michael Addition; stereoselective reaction;

prop-2-ene-1-thiol (870-23-5) + 3-crotonoyl-1,3-oxazolidin-2-one (123492-60-4) → 3-((S)-3-Allylsulfanyl-butyryl)-oxazolidin-2-one

Conditions	Yield
With N-(4-((S)-(benzyloxy)((1S,2R,4S,5R)-5-vinylquinuclidin-2-yl)methyl)quinolin-6-yl)-4-(dimethylamino)benzenesulfonamide In chloroform at -20℃; for 84h; Michael Addition; enantioselective reaction;	97%

prop-2-ene-1-thiol (870-23-5) + 4-(naphthalen-1-ylmethoxy)benzaldehyde → bis(propenyl)-4-(naphthalen-1-ylmethoxy)phenyl dithioacetal

Conditions	Yield
With [1-(3-sulfonic acid)]propyl-3-methylimidazolium hydrogen sulfate In dichloromethane at 40℃; for 39h; Reagent/catalyst;	97%
With bronsted acidic ionic liquid-HSO4 In dichloromethane at 40℃; for 3h;	97%

prop-2-ene-1-thiol (870-23-5) + 5-(2-nitrovinyl)benzo[1,3]dioxole (1485-00-3) → 2-(allylthio)-2-(3,4-(methylenedioxy)phenyl)-1-nitroethane (128869-28-3)

Conditions	Yield
With piperidine In diethyl ether	96%

prop-2-ene-1-thiol (870-23-5) + 2,3,4,5,6-pentafluorobiphenyl (784-14-5) → 4-allylsulfanyl-2,3,5,6-tetrafluorobiphenyl (1262852-83-4)

Conditions	Yield
With potassium carbonate In N,N-dimethyl-formamide at 40℃; for 2h; Inert atmosphere; regioselective reaction;	96%

prop-2-ene-1-thiol (870-23-5) + phenyl isocyanate (103-71-9) → S-(2-propenyl) N-phenylmonothiocarbamate (99307-07-0)

Conditions	Yield
With triethylamine In tetrahydrofuran at 0℃; for 1.5h; Inert atmosphere;	96%

3-(naphthalen-1-ylmethoxy)benzaldehyde + prop-2-ene-1-thiol (870-23-5) → bis(propenyl)-3-(naphthalen-1-ylmethoxy)phenyl dithioacetal

Conditions	Yield
With [1-(3-sulfonic acid)]propyl-3-methylimidazolium hydrogen sulfate In dichloromethane at 40℃; for 39h; Reagent/catalyst;	96%
With bronsted acidic ionic liquid-HSO4 In dichloromethane at 40℃; for 3h;	96%

prop-2-ene-1-thiol (870-23-5) + methyl vinyl ketone (78-94-4) → 4-(allylsulfanyl)butan-2-one

Conditions	Yield
With iodine at 0℃; for 0.0833333h; Michael addition;	95%
With 1,3-dicyclohexylimidazolium-2-carboxylate In tetrahydrofuran at 21℃; for 2h; Michael Addition;	93%
iron(III) chloride at 20℃; for 0.0833333h;	91%

prop-2-ene-1-thiol (870-23-5) + methylsulphinyl chloride (676-85-7) → allyl methyl-thiosulfinate (104228-49-1)

Conditions	Yield
With pyridine In diethyl ether at 0 - 2℃; for 1h;	95%

prop-2-ene-1-thiol (870-23-5) + (E)-4-Methyl-5-nitropent-4-en-2-one (149795-01-7) → 2-Allylsulfanyl-2-methyl-1-nitro-pentan-3-one (190784-99-7)

Conditions	Yield
With triethylamine In acetonitrile for 1h;	95%

prop-2-ene-1-thiol (870-23-5) + (E)-2,4-Dimethyl-5-nitropent-4-en-3-one (149795-05-1) → 2-Allylsulfanyl-2,4-dimethyl-1-nitro-pentan-3-one (190785-00-3)

Conditions	Yield
With triethylamine In acetonitrile for 1h;	95%

prop-2-ene-1-thiol (870-23-5) + (E)-2-nitromethylene cyclohexanone (155990-40-2) → 2-Allylsulfanyl-2-nitromethyl-cyclohexanone (190785-03-6)

Conditions	Yield
With triethylamine In acetonitrile for 1h;	95%

prop-2-ene-1-thiol (870-23-5) + N-allyl-N-[(2E)-4-(2,3-dihydro-1H-indol-1-yl)-4-oxobut-2-enyl]-4-methylbenzenesulfonamide (686348-77-6) → N-allyl-N-[2-(allylthio)-4-(2,3-dihydro-1H-indol-1-yl)-4-oxobutyl]-4-methylbenzenesulfonamide (686348-78-7)

Conditions	Yield
With sodium methylate In tetrahydrofuran; methanol at 0℃; for 0.25h;	95%

2,3-dihydro-2H-furan (1191-99-7) + prop-2-ene-1-thiol (870-23-5) → 2-allylsulfanyl oxolane

Conditions	Yield
With pyridinium p-toluenesulfonate In dichloromethane at 20℃; for 8h;	95%

2-(benzyldisulfanyl)benzo[d]thiazole (27639-57-2) + prop-2-ene-1-thiol (870-23-5) → 1-allyl-2-benzyldisulfane

Conditions	Yield
In chloroform at 20℃; for 5h;	95%

3,6-dichlorpyridazine (141-30-0) + prop-2-ene-1-thiol (870-23-5) → 3-allylsulfanyl-6-chloropyridazine (51389-01-6)

Conditions	Yield
With sodium hydroxide In methanol; water at 20℃;	95%
With sodium hydroxide In methanol; water	95%

3-methoxy-4-(naphthalen-1-ylmethoxy)benzaldehyde (212621-51-7) + prop-2-ene-1-thiol (870-23-5) → bis(propenyl)-4-(naphthalen-1-ylmethoxy)-3-methoxylphenyl dithioacetal

Conditions	Yield
With [1-(3-sulfonic acid)]propyl-3-methylimidazolium hydrogen sulfate In dichloromethane at 40℃; for 42h; Reagent/catalyst;	95%
With bronsted acidic ionic liquid-HSO4 In dichloromethane at 40℃; for 3h;	95%

Upstream product

• 50586-78-2 dithiocarbamic acid allyl ester 
• 127040-65-7 S-allyl-N,N'-diphenyl-isothiourea 
• 107-05-1 3-chloroprop-1-ene 
• 23127-41-5 (2R)-2-(acetylamino)-3-(prop-2-en-1-ylsulfanyl)propanoic acid 
• 62571-86-2 captopril 
• 539-86-6 allicin 
• 70-18-8 GLUTATHIONE 
• 463-49-0 1,2-propanediene 
• 7783-06-4 hydrogen sulfide 
• 74-93-1 methylthiol 
• 31207-14-4 α-bromomethylthiirane 
• 52894-43-6 di(prop-2-enyl) trithiocarbonate 
• 7664-41-7 ammonia 
• 764-49-8 allyl thiocyanate 

Downstream Products

• 10061-87-7 allyl-diphenyl-phosphine sulfide 
• 620-02-0 5-Methylfurfural 
• 116724-98-2 5-((allylthio)methyl)-2-furfural 
• 128869-47-6 1-(allylthio)-1-nitromethylcyclohexane 
• 128869-27-2 2-(allylthio)-1-nitro-2-(3,4,5-trimethoxyphenyl)ethane 
• 127865-40-1 2-(allylthio)-2-(4-methoxyphenyl)-1-nitroethane 
• 97369-85-2 5-(Methylthio)-2-phenyl-4-penten-2-ol 
• 97369-72-7 5-(Methylthio)-2-phenyl-4-penten-2-ol 
• 21593-77-1 S-allyl cysteine 
• 10152-76-8 allylmethyl sulfide 
• 142672-60-4 2-(2-thiapent-4-enyl)nitrobenzene 
• 209598-02-7 2-Phenyl-thiopropionic acid S-allyl ester 
• 5296-62-8 allyl ethyl sulfide 
• 42068-67-7 chlorothioformic acid allyl ester 

Relevant articles and documents

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OLEFIN METATHESIS REACTIONS OF AMINO ACIDS, PEPTIDES AND PROTEINS CONTAINING ALLYL SULFIDE GROUPS

A method for the modification of an amino acid, protein or peptide is disclosed. The method comprises reacting a carbon-carbon double bond-containing compound with an amino acid, a protein or a peptide containing an allyl sulfide group in the presence of a catalyst which promotes olefin metathesis, to form a modified amino acid, protein or peptide. Preferred carbon-carbon double bond-containing compounds include carbohydrates.

CHLOROTHIOFORMATE MANUFACTURING METHOD

The present invention relates to a process for producing chlorothioformate comprising reacting an alkenyl mercaptan with phosgene in a reactor in the presence of a carboxylic acid amide in an organic solvent, characterized in that the carboxylic acid amide is preliminary charged to the reactor in an amount of 10 to 50% by weight based on the whole amount of the carboxylic acid amide, and subsequently, the compound of the formula (I), phosgene and the remaining carboxylic acid amide are charged to the reactor.