DK0750001T3 - Fremgangsmåde til fremstilling af ethylenoxidafsluttede polyoler ud fra dobbeltmetalcyanidkatalyserede polyoler - Google Patents

Fremgangsmåde til fremstilling af ethylenoxidafsluttede polyoler ud fra dobbeltmetalcyanidkatalyserede polyoler

Info

Publication number
DK0750001T3
DK0750001T3 DK96304478T DK96304478T DK0750001T3 DK 0750001 T3 DK0750001 T3 DK 0750001T3 DK 96304478 T DK96304478 T DK 96304478T DK 96304478 T DK96304478 T DK 96304478T DK 0750001 T3 DK0750001 T3 DK 0750001T3
Authority
DK
Denmark
Prior art keywords
polyols
preparation
ethylene oxide
metal cyanide
double metal
Prior art date
Application number
DK96304478T
Other languages
Danish (da)
English (en)
Inventor
Jose F Pazos
Original Assignee
Bayer Antwerpen Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer Antwerpen Nv filed Critical Bayer Antwerpen Nv
Application granted granted Critical
Publication of DK0750001T3 publication Critical patent/DK0750001T3/da

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
    • C08G65/2642Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds characterised by the catalyst used
    • C08G65/2645Metals or compounds thereof, e.g. salts
    • C08G65/2663Metal cyanide catalysts, i.e. DMC's
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40High-molecular-weight compounds
    • C08G18/48Polyethers
    • C08G18/4833Polyethers containing oxyethylene units
    • C08G18/4837Polyethers containing oxyethylene units and other oxyalkylene units
    • C08G18/4841Polyethers containing oxyethylene units and other oxyalkylene units containing oxyethylene end groups
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40High-molecular-weight compounds
    • C08G18/48Polyethers
    • C08G18/4866Polyethers having a low unsaturation value
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
    • C08G65/2603Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen
    • C08G65/2606Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups
    • C08G65/2609Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups containing aliphatic hydroxyl groups
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
    • C08G65/2642Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds characterised by the catalyst used
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/04Preparatory processes
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/26Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
    • C08G69/28Preparatory processes
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • C08L71/02Polyalkylene oxides
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2101/00Manufacture of cellular products
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2190/00Compositions for sealing or packing joints
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C08L2666/14Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
    • C08L2666/22Macromolecular compounds not provided for in C08L2666/16 - C08L2666/20

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Toxicology (AREA)
  • Polyethers (AREA)
  • Polyurethanes Or Polyureas (AREA)
DK96304478T 1995-06-21 1996-06-17 Fremgangsmåde til fremstilling af ethylenoxidafsluttede polyoler ud fra dobbeltmetalcyanidkatalyserede polyoler DK0750001T3 (da)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/493,372 US5563221A (en) 1995-06-21 1995-06-21 Process for making ethylene oxide-capped polyols from double metal cyanide-catalyzed polyols

Publications (1)

Publication Number Publication Date
DK0750001T3 true DK0750001T3 (da) 2001-03-19

Family

ID=23959967

Family Applications (1)

Application Number Title Priority Date Filing Date
DK96304478T DK0750001T3 (da) 1995-06-21 1996-06-17 Fremgangsmåde til fremstilling af ethylenoxidafsluttede polyoler ud fra dobbeltmetalcyanidkatalyserede polyoler

Country Status (19)

Country Link
US (1) US5563221A (fr)
EP (1) EP0750001B1 (fr)
JP (1) JP3247612B2 (fr)
KR (1) KR100451872B1 (fr)
CN (1) CN1090198C (fr)
AR (1) AR002561A1 (fr)
AT (1) ATE199094T1 (fr)
AU (1) AU694874B2 (fr)
BR (1) BR9602829A (fr)
CA (1) CA2177871C (fr)
DE (1) DE69611743T2 (fr)
DK (1) DK0750001T3 (fr)
ES (1) ES2153938T3 (fr)
GR (1) GR3035686T3 (fr)
HU (1) HU217692B (fr)
MX (1) MX9602435A (fr)
RO (1) RO117101B1 (fr)
TW (1) TW322470B (fr)
ZA (1) ZA965263B (fr)

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5700847A (en) * 1995-12-04 1997-12-23 Arco Chemical Technology, L.P. Molded polyurethane foam with enhanced physical properties
US5691441A (en) * 1996-10-11 1997-11-25 Arco Chemical Technology, L.P. Spandex elastomers
US5708118A (en) * 1996-10-11 1998-01-13 Arco Chemical Technology, L.P. Spandex elastomers
US5723563A (en) * 1996-10-11 1998-03-03 Arco Chemical Technology, L.P. Spandex elastomers
US6008263A (en) * 1998-04-03 1999-12-28 Lyondell Chemical Worldwide, Inc. Molded and slab polyurethane foam prepared from double metal cyanide complex-catalyzed polyoxyalkylene polyols and polyols suitable for the preparation thereof
US6063309A (en) * 1998-07-13 2000-05-16 Arco Chemical Technology L.P. Dispersion polyols for hypersoft polyurethane foam
DE19918727A1 (de) 1999-04-24 2000-10-26 Bayer Ag Langkettige Polyetherpolyole mit hohem Anteil primärer OH-Gruppen
AR025544A1 (es) 1999-07-09 2002-12-04 Dow Global Technologies Inc Proceso para preparar polimeros de poli(oxietileno) y los polimeros de poli(oxietileno) obtenidos con dicho proceso
US6642423B2 (en) 1999-07-09 2003-11-04 Dow Global Technologies, Inc. Polymerization of ethylene oxide using metal cyanide catalysts
DE19944762A1 (de) * 1999-09-17 2001-03-22 Basf Ag Verfahren zur Herstellung von Blockweichschaumpolyolen
AU2001255735A1 (en) 2000-04-28 2001-11-12 Synuthane International, Inc. Double metal cyanide catalysts containing polyglycol ether complexing agents
US6462133B2 (en) * 2000-05-19 2002-10-08 Dow Global Technologies, Inc. Polymerizing alkylene oxide with phospazen (IUM) crosslinked polymer
US6344494B1 (en) 2000-05-24 2002-02-05 Basf Corporation Use of low unsaturated polyether polyols in slabstock foam applications
US6201035B1 (en) 2000-05-24 2001-03-13 Basf Corporation Use of low unsaturated polyether polyols in high resilience slabstock foam applications
AU2002226888A1 (en) * 2000-10-23 2002-05-06 Huntsman International Llc High performance sealant formulations based on MDI prepolymers
US6835801B2 (en) * 2002-07-19 2004-12-28 Bayer Antwerp, N.V. Activated starter mixtures and the processes related thereto
US20040064001A1 (en) * 2002-09-30 2004-04-01 Stephan Ehlers Processes for preparing ethylene oxide-capped polyols
ZA200503601B (en) * 2002-11-07 2006-11-29 Dow Global Technologies Inc Method for preparing metal cyanide catalysts using polymerizable complexing agents
ZA200506576B (en) * 2003-03-07 2006-12-27 Dow Global Technologies Inc Continuous process and system of producing polyether polyols
DE10324998A1 (de) * 2003-06-03 2004-12-23 Basf Ag Herstellung von Polyetheralkoholen unter Verwendung der DMC-Katalyse
US6884826B2 (en) * 2003-06-09 2005-04-26 Bayer Antwerp, N.V. Process for preparing double metal cyanide catalyzed polyols
US20050014979A1 (en) * 2003-07-08 2005-01-20 Eleveld Michiel Barend Preparation of an alkoxylate composition using a double metal cyanide catalyst
US7005552B2 (en) * 2003-11-03 2006-02-28 Bayer Materialscience Llc Single reactor synthesis of KOH-capped polyols based on DMC-synthesized intermediates
US7186867B2 (en) 2004-04-21 2007-03-06 Basf Aktiengesellschaft Process for preparing reactive polyether polyols having an ethylene oxide end block
DE102004047524A1 (de) * 2004-09-28 2006-03-30 Basf Ag Verfahren zur Herstellung von Polyurethan-Weichschaumstoffen
DE102006006696A1 (de) * 2006-02-14 2007-08-23 Clariant International Limited Polyalkylenglykol-Schmiermittelbasisöle mit enger Molmassenverteilung
DE102008002091A1 (de) 2007-05-31 2008-12-11 Basf Se Verfahren zur Herstellung von Monoalkylenglykolmonoethern
MX2012012596A (es) 2010-04-30 2013-05-06 Basf Se Polioles de polieter, proceso para preparar polioles de polieter y su uso para producir poliuretanos.
US9115246B2 (en) 2010-04-30 2015-08-25 Basf Se Polyether polyols, process for preparing polyether polyols and their use for producing polyurethanes
US9403961B2 (en) * 2010-11-18 2016-08-02 Dow Global Technologies Llc Flame resistant flexible polyurethane foam
EP2726543A2 (fr) * 2011-06-29 2014-05-07 Dow Global Technologies LLC Mousse de polyuréthane flexible résistante à la flamme thermiquement stable
US9035105B2 (en) 2012-07-20 2015-05-19 Bayer Materialscience Llc Process for the in situ production of polyether polyols based on renewable materials and their use in the production of flexible polyurethane foams
US9051412B2 (en) * 2013-03-14 2015-06-09 Bayer Materialscience Llc Base-catalyzed, long chain, active polyethers from short chain DMC-catalyzed starters
US20230147479A1 (en) 2021-11-05 2023-05-11 Covestro Llc Processes and production plants for producing polyols
PL442356A1 (pl) 2022-09-26 2024-04-02 Pcc Rokita Spółka Akcyjna Poliol polieterowy, sposób jego wytwarzania i jego zastosowanie oraz elastyczna pianka poliuretanowa

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427335A (en) * 1963-02-14 1969-02-11 Gen Tire & Rubber Co Double metal cyanides complexed with an acyclic aliphatic saturated monoether,an ester and a cyclic ether and methods for making the same
US3427256A (en) * 1963-02-14 1969-02-11 Gen Tire & Rubber Co Double metal cyanide complex compounds
DE1222261B (de) * 1963-04-20 1966-08-04 Bayer Ag Verfahren zur Herstellung von Polyaethern durch Polymerisation von Alkylenoxyden
US3317508A (en) * 1964-11-09 1967-05-02 Union Carbide Corp Process for making alkylene oxidepolyol adducts
US3823145A (en) * 1968-07-26 1974-07-09 Basf Wyandotte Corp Removal of impurities from polyols
US3715402A (en) * 1969-08-08 1973-02-06 Basf Wyandotte Corp Removal of catalysts from polyols
US3829505A (en) * 1970-02-24 1974-08-13 Gen Tire & Rubber Co Polyethers and method for making the same
US3941849A (en) * 1972-07-07 1976-03-02 The General Tire & Rubber Company Polyethers and method for making the same
CA1155871A (fr) * 1980-10-16 1983-10-25 Gencorp Inc. Methode de traitement de poly(oxypropylene) et de poly(oxy-1,2-butylene)
AU552988B2 (en) * 1982-03-31 1986-06-26 Shell Internationale Research Maatschappij B.V. Polymerizing epoxides and catalyst suspensions for this
AU551979B2 (en) * 1982-03-31 1986-05-15 Shell Internationale Research Maatschappij B.V. Epoxy polymerisation catalysts
US4495081A (en) * 1982-07-13 1985-01-22 The Dow Chemical Company Compositions containing polyether polyols and aliphatic primary amines
US4687851A (en) * 1985-08-15 1987-08-18 The Dow Chemical Company Polyurethane elastomers prepared from high equivalent weight polyahls
US4721818A (en) * 1987-03-20 1988-01-26 Atlantic Richfield Company Purification of polyols prepared using double metal cyanide complex catalysts
US4877906A (en) * 1988-11-25 1989-10-31 Arco Chemical Technology, Inc. Purification of polyols prepared using double metal cyanide complex catalysts
AU7792991A (en) * 1990-03-30 1991-12-31 Olin Corporation Process for removing double metal cyanide complex catalyst residues from catalyst-residue containing polyols
US5144093A (en) * 1991-04-29 1992-09-01 Olin Corporation Process for purifying and end-capping polyols made using double metal cyanide catalysts
US5235114A (en) * 1991-04-29 1993-08-10 Olin Corporation Process for purifying and end-capping polyols made using double metal cyanide catalysts
US5158922A (en) * 1992-02-04 1992-10-27 Arco Chemical Technology, L.P. Process for preparing metal cyanide complex catalyst

Also Published As

Publication number Publication date
CN1150582A (zh) 1997-05-28
RO117101B1 (ro) 2001-10-30
TW322470B (fr) 1997-12-11
DE69611743D1 (de) 2001-03-15
GR3035686T3 (en) 2001-06-29
AU694874B2 (en) 1998-07-30
AU5605796A (en) 1997-01-09
ZA965263B (en) 1997-01-09
CA2177871C (fr) 2009-07-28
KR970001292A (ko) 1997-01-24
HU9601691D0 (en) 1996-08-28
JPH093186A (ja) 1997-01-07
ES2153938T3 (es) 2001-03-16
JP3247612B2 (ja) 2002-01-21
MX9602435A (es) 1997-02-28
EP0750001A3 (fr) 1997-07-23
EP0750001B1 (fr) 2001-02-07
EP0750001A2 (fr) 1996-12-27
HUP9601691A3 (en) 1997-12-29
CN1090198C (zh) 2002-09-04
AR002561A1 (es) 1998-03-25
KR100451872B1 (ko) 2004-12-04
CA2177871A1 (fr) 1996-12-22
US5563221A (en) 1996-10-08
BR9602829A (pt) 1998-10-06
HU217692B (hu) 2000-03-28
DE69611743T2 (de) 2001-05-31
HUP9601691A2 (en) 1997-04-28
ATE199094T1 (de) 2001-02-15

Similar Documents

Publication Publication Date Title
DK0750001T3 (da) Fremgangsmåde til fremstilling af ethylenoxidafsluttede polyoler ud fra dobbeltmetalcyanidkatalyserede polyoler
EP0729940A3 (fr) Procédé pour la préparation de nitriles fluorés
ATE235527T1 (de) Doppelmetallcyanidkatalysatorzusammensetzung enthaltend polyetherpolyole
ZA987608B (en) Process for manufacture of superabsorbent-coated yarn
HK1002767A1 (en) Polymerization of cyclic ethers using selected metal compound catalysts
HUP9900897A3 (en) Process for the production of cesium compounds
DZ2912A1 (fr) Procédé pour la préparation de pyrazolo Ä4,3-DÜpyrimidine-7-ones, et intermédiaires pour ce procédé.
DK1154986T3 (da) Fremgangsmåde til fremstilling af iopamidol
IL113060A0 (en) Process for the manufacture of metal tube
PL338679A1 (en) Method of obtaining l-glutamic acid by fermentation
GR3034948T3 (en) Process for the preparation of acrylic acid from acroleine by redox reaction
HUP0101263A3 (en) Process for producing optically active threo-3-amino-1,2-epoxy compounds
FR2718250B1 (fr) Procédé de sondage d'un canal.
FR2716449B1 (fr) Procédé de purification du pentafluoroéthane.
IT1283316B1 (it) Canale di raccordo per crogiolo di degassificazione
HUP0103910A3 (en) Method for production of alpha,alpha-dimethylphenyl acetic acid from alpha,alpha-dimethyl benzyl cyanide
PL336480A1 (en) Novel method of obtaining 3-n-,n-dicyclobutylamino-8-fluoro-3,4-dihydro-2h-1-benzopirane-5-carboxamide
EP0445711A3 (en) Process for the manufacture of straw tube drift chambers
HK1044761A1 (zh) 製備頭孢泊肟酸的方法
HUP0102710A2 (hu) Új eljárás prosztaglandinvegyületek előállítására
FR2795847B1 (fr) Procede de perfectionnement de fabrication d'un insert
ZA993974B (en) Method of purifying carbazole ester precursors of 6-chloro-Ó-methyl-carbazole-2-acetic acid.
EP0712849A3 (fr) Procédé pour la préparation des quinazolin-2,4-diones substituées
FR2691458B1 (fr) Procédé de déshydrocyanation de dinitriles aliphatiques.
IL143307A0 (en) Process for the production of trifluoromethylpropane cyanohydrin