Title of Invention	"PROCESS FOR PREPARING PHTHALOYL CHLORIDE"
Abstract	ABSTRACT "A PROCESS FOR PREPARING PHTHALOYL CHLORIDE OF THE FORMULA (I)" A process for preparing phthaloyl chloride of the formula (I) •1 in which phthalic anhydride of the formula (II) is reacted with phosgene in the presence of a catalyst, characterized in that the catalyst used is an N,N-disubstituted formamide of the general formula (III) in which R' and R^ are each independently - Ca-Cg-cycloalkyl, - Ce-Cio-aryl or - C7-Ci2-arylalk;yl and wherein the said process is carried out at a temperature range of 20°C to 150°C and pressure in the range of 0.1 to 50 bar.

Title of Invention

"PROCESS FOR PREPARING PHTHALOYL CHLORIDE"

Abstract

ABSTRACT "A PROCESS FOR PREPARING PHTHALOYL CHLORIDE OF THE FORMULA (I)" A process for preparing phthaloyl chloride of the formula (I) •1 in which phthalic anhydride of the formula (II) is reacted with phosgene in the presence of a catalyst, characterized in that the catalyst used is an N,N-disubstituted formamide of the general formula (III) in which R' and R^ are each independently - Ca-Cg-cycloalkyl, - Ce-Cio-aryl or - C7-Ci2-arylalk;yl and wherein the said process is carried out at a temperature range of 20°C to 150°C and pressure in the range of 0.1 to 50 bar.

Full Text	% WE CLAIM: 1. A process for preparing phthaloyl chloride of the formula (I) O o in which phthalic anhydride of the formula (II) O is reacted with phosgene in the presence of a catalyst, characterized in that the catalyst used is an N,N-disubstituted formamide of the general formula (III) V ^' in which R' and R^ are each independently - Cs-Cg-cycloalkyl, - Ce-Cio-aryl or - C7-Ci2-arylalkyl and wherein the said process is carried out at a temperature range of 20°C to 150°C and pressure in the range of 0.1 to 50 bar. 2. A process for preparing phthaloyl chloride of the formula (I) o o comprising: reacting a phthalic anhydride of the formula (II) O with phosgene in the presence of a catalyst; wherein the catalyst used is an N,N-disubstituted formamide of the general formula (III) > - \ , (ni) H R in which: R' and R^ are each, independently, a straight-chain or branched C8-C22-alkyl- or -alkenyl radical, wherein the total molecular weight of the N,N-disubstituted formamide is at least 269 g/mol. 3. The process as claimed in Claim 1, wherein the N,N-disubstituted formamide of the formula (III) used has an R^ and R^ which are each independently a Cs-Cg cycloalkyl radical. 4. A process for preparing phthaloyl chloride of the formula (I) O CCc! ® o comprising: reacting a phthalic anhydride of the formula (II) 0 with phosgene in the presence of a catalyst; wherein the catalyst used is an N,N-disubstituted formamide of the general formula (III) / C - N (III) H R in which R' and R^ are each, independently a benzyl, phenyl, phenylethyl, phenylpropyl, naphthyl, naphthylmethyl or naphthylethyl radicals. 5. The process as claimed in Claim 1, wherein the N,N-disubstituted formamide of the general formula (III) used is - N,N-dioctylformamide, - N,N-dinonylformamide, - N,N-didecylformamide, - N,N-diundecylformamide, - N,N-didodecylformamide, - N,N-ditridecylformamide, - N,N-ditetradecylformamide, - N,N-dipentadecylformamide, - N,N-dihexadecylformamide, - N,N-dioctadecylformamide, - N,N-dicyclopentylformamide, - N,N-dicyclohexylformamide, - N,N-dibenzylformamide, - N-methyl-N-benzylformamide or - N-methyl-N-naphthylmethylformamide. 6. The process as claimed in Claim 1, wherein the N,N-disubstituted formamides of the formula (III) are prepared by reacting the corresponding amine of the formula HNR'R^ where R' and R^ may each be as defined for the formula (III) with formic acid. 7. The process as claimed in Claim 1, wherein 1.0 mol to 3.0 mol of phosgene are used for 1 mol of phthalic anhydride of the formula (II). 8. The process as claimed in Claim 1, wherein, based on 1 mol of phthalic anhydride of the formula (II), a total of 0.01-0.20 mol of N,N-disubstituted formamide of the formula (III) is used. 9. The process as claimed in Claim 1, wherein phthalic anhydride is initially charged in an inert diluent and the phosgene and the N,N-disubstituted formamide of the formula (III) are subsequently each independently metered in continuously or "semi-continuously". 10. The process as claimed in Claim 9, wherein the N,N-disubstituted formamide of the formula (III) metered in is dissolved in an inert solvent which is selected from the inert solvent of the phthalic anhydride and a different inert solvent. 11. The process as claimed in Claim 1, wherein the phthalic anhydride is initially charged in an inert solvent together with the entire amount or a portion of the N,N-disubstituted formamide of the formula (III), the mixture is then heated to the reaction temperature and the phosgene and any remaining N,N-disubstituted formamide of the formula (III) are metered in continuously or "semicontinuously". 12. The process as claimed in Claim 1, wherein the N,N-disubstituted formamide of the formula (III) used has and R' and R^ which are each the same Ca-Cg-cycloalkyl radical. 13. The process as claimed in claim 1, wherein the N,N-disubstituted formamide of the formula (III) used has and R^ and R^ which are each a cyclopentyl or a cyclohexyl radical. 14. The process as claimed in Claim 2, wherein 1.0 mol to 3.0 mol of phosgene are used for 1 mol of phthalic anhydride of the formula (II). 15. The process as claimed in Claim 12, wherein 1.0 mol to 3.0 mol of phosgene are used for 1 mol of phthalic anhydride of the formula (II). 16. The process as claimed in Claim 2, wherein, based on 1 mol of phthalic anhydride of the formula (II), a total of 0.01 to 0.20 mol of N,N-disubstituted formamide of the formula (III) is used. 17. The process as claimed in Claim 12, wherein, based on 1 mol of phthalic anhydride of the formula (II), a total of 0.01 to 0.20 mol of N,N-disubstituted formamide of the formula (III) is used. 18. The process as claimed in Claim 9, wherein the N,N-disubstituted formamide of the formula (III) metered in is initially melted and then metered in as a melt. Dated this 16* day of May 2005 t-^ 'p^ [DEBASHISH BANERJEE] OF REMFRY & SAGAR ATTORNEY FOR THE APPLICANT[S]

Full Text

%
WE CLAIM:
1. A process for preparing phthaloyl chloride of the formula (I)
O
o
in which phthalic anhydride of the formula (II)
O
is reacted with phosgene in the presence of a catalyst, characterized in that the catalyst
used is an N,N-disubstituted formamide of the general formula (III)
V ^'
in which
R' and R^ are each independently
- Cs-Cg-cycloalkyl,
- Ce-Cio-aryl or
- C7-Ci2-arylalkyl
and wherein the said process is carried out at a temperature range of 20°C to 150°C and
pressure in the range of 0.1 to 50 bar.
2. A process for preparing phthaloyl chloride of the formula (I)
o
o
comprising:
reacting a phthalic anhydride of the formula (II)
O
with phosgene in the presence of a catalyst;
wherein the catalyst used is an N,N-disubstituted formamide of the general formula (III)
> - \ , (ni)
H R
in which:
R' and R^ are each, independently, a straight-chain or branched C8-C22-alkyl- or -alkenyl
radical, wherein the total molecular weight of the N,N-disubstituted formamide is at least
269 g/mol.
3. The process as claimed in Claim 1, wherein the N,N-disubstituted formamide of the
formula (III) used has an R^ and R^ which are each independently a Cs-Cg cycloalkyl
radical.
4. A process for preparing phthaloyl chloride of the formula (I)
O
CCc! ®
o
comprising:
reacting a phthalic anhydride of the formula (II)
0
with phosgene in the presence of a catalyst;
wherein the catalyst used is an N,N-disubstituted formamide of the general formula (III)
/ C - N (III)
H R
in which R' and R^ are each, independently a benzyl, phenyl, phenylethyl, phenylpropyl,
naphthyl, naphthylmethyl or naphthylethyl radicals.
5. The process as claimed in Claim 1, wherein the N,N-disubstituted formamide of the
general formula (III) used is
- N,N-dioctylformamide,
- N,N-dinonylformamide,
- N,N-didecylformamide,
- N,N-diundecylformamide,
- N,N-didodecylformamide,
- N,N-ditridecylformamide,
- N,N-ditetradecylformamide,
- N,N-dipentadecylformamide,
- N,N-dihexadecylformamide,
- N,N-dioctadecylformamide,
- N,N-dicyclopentylformamide,
- N,N-dicyclohexylformamide,
- N,N-dibenzylformamide,
- N-methyl-N-benzylformamide or
- N-methyl-N-naphthylmethylformamide.
6. The process as claimed in Claim 1, wherein the N,N-disubstituted formamides of the
formula (III) are prepared by reacting the corresponding amine of the formula HNR'R^
where R' and R^ may each be as defined for the formula (III) with formic acid.
7. The process as claimed in Claim 1, wherein 1.0 mol to 3.0 mol of phosgene are used for 1
mol of phthalic anhydride of the formula (II).
8. The process as claimed in Claim 1, wherein, based on 1 mol of phthalic anhydride of the
formula (II), a total of 0.01-0.20 mol of N,N-disubstituted formamide of the formula (III)
is used.
9. The process as claimed in Claim 1, wherein phthalic anhydride is initially charged in an
inert diluent and the phosgene and the N,N-disubstituted formamide of the formula (III)
are subsequently each independently metered in continuously or "semi-continuously".
10. The process as claimed in Claim 9, wherein the N,N-disubstituted formamide of the
formula (III) metered in is dissolved in an inert solvent which is selected from the inert
solvent of the phthalic anhydride and a different inert solvent.
11. The process as claimed in Claim 1, wherein the phthalic anhydride is initially charged in
an inert solvent together with the entire amount or a portion of the N,N-disubstituted
formamide of the formula (III), the mixture is then heated to the reaction temperature and
the phosgene and any remaining N,N-disubstituted formamide of the formula (III) are
metered in continuously or "semicontinuously".
12. The process as claimed in Claim 1, wherein the N,N-disubstituted formamide of the
formula (III) used has and R' and R^ which are each the same Ca-Cg-cycloalkyl radical.
13. The process as claimed in claim 1, wherein the N,N-disubstituted formamide of the
formula (III) used has and R^ and R^ which are each a cyclopentyl or a cyclohexyl
radical.
14. The process as claimed in Claim 2, wherein 1.0 mol to 3.0 mol of phosgene are used for 1
mol of phthalic anhydride of the formula (II).
15. The process as claimed in Claim 12, wherein 1.0 mol to 3.0 mol of phosgene are used for
1 mol of phthalic anhydride of the formula (II).
16. The process as claimed in Claim 2, wherein, based on 1 mol of phthalic anhydride of the
formula (II), a total of 0.01 to 0.20 mol of N,N-disubstituted formamide of the formula
(III) is used.
17. The process as claimed in Claim 12, wherein, based on 1 mol of phthalic anhydride of the
formula (II), a total of 0.01 to 0.20 mol of N,N-disubstituted formamide of the formula
(III) is used.
18. The process as claimed in Claim 9, wherein the N,N-disubstituted formamide of the
formula (III) metered in is initially melted and then metered in as a melt.
Dated this 16* day of May 2005 t-^ 'p^
[DEBASHISH BANERJEE]
OF REMFRY & SAGAR
ATTORNEY FOR THE APPLICANT[S]

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Patent Number

270993

Indian Patent Application Number

1251/DEL/2005

PG Journal Number

05/2016

Publication Date

29-Jan-2016

Grant Date

29-Jan-2016

Date of Filing

16-May-2005

Name of Patentee

LANXESS DEUTSCHLAND GMBH

Applicant Address

D-51369 LEVERKUSEN, GERMANY.

Inventors:

#	Inventor's Name	Inventor's Address
1	ANDREAS JOB	WILHELM-SCHLOMBS-ALLEE 4, 50858 KOLN, GERMANY.

PCT International Classification Number

C07C 63/22

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	1020040248079	2004-05-17	Germany