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

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26—Macromolecular 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
    • C08G65/2642—Macromolecular 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
    • C08G65/2645—Metals or compounds thereof, e.g. salts
    • C08G65/2663—Metal cyanide catalysts, i.e. DMC's
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
    • C08G18/4841—Polyethers containing oxyethylene units and other oxyalkylene units containing oxyethylene end groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4866—Polyethers having a low unsaturation value
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26—Macromolecular 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
    • C08G65/2603—Macromolecular 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
    • C08G65/2606—Macromolecular 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
    • C08G65/2609—Macromolecular 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26—Macromolecular 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
    • C08G65/2642—Macromolecular 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/04—Preparatory processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
    • C08G69/28—Preparatory processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • C08L71/02—Polyalkylene oxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2101/00—Manufacture of cellular products
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2190/00—Compositions for sealing or packing joints
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition 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
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C08L2666/14—Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
    • C08L2666/22—Macromolecular 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 (hu)
EP (1) EP0750001B1 (hu)
JP (1) JP3247612B2 (hu)
KR (1) KR100451872B1 (hu)
CN (1) CN1090198C (hu)
AR (1) AR002561A1 (hu)
AT (1) ATE199094T1 (hu)
AU (1) AU694874B2 (hu)
BR (1) BR9602829A (hu)
CA (1) CA2177871C (hu)
DE (1) DE69611743T2 (hu)
DK (1) DK0750001T3 (hu)
ES (1) ES2153938T3 (hu)
GR (1) GR3035686T3 (hu)
HU (1) HU217692B (hu)
MX (1) MX9602435A (hu)
RO (1) RO117101B1 (hu)
TW (1) TW322470B (hu)
ZA (1) ZA965263B (hu)

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
US5708118A (en) * 1996-10-11 1998-01-13 Arco Chemical Technology, L.P. Spandex elastomers
US5691441A (en) * 1996-10-11 1997-11-25 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
US6642423B2 (en) 1999-07-09 2003-11-04 Dow Global Technologies, Inc. Polymerization of ethylene oxide using metal cyanide catalysts
KR20020019949A (ko) 1999-07-09 2002-03-13 그래햄 이. 테일러 금속 시아나이드 촉매를 사용한 에틸렌 옥사이드의 중합
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
ES2255555T3 (es) * 2000-05-19 2006-07-01 Dow Global Technologies Inc. Metodo para preparar y utilizar catalizadores de fosfozenio soportados.
US6201035B1 (en) 2000-05-24 2001-03-13 Basf Corporation Use of low unsaturated polyether polyols in high resilience slabstock foam applications
US6344494B1 (en) 2000-05-24 2002-02-05 Basf Corporation Use of low unsaturated polyether polyols in slabstock foam applications
EP1328564A1 (en) * 2000-10-23 2003-07-23 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
CN100348643C (zh) * 2002-11-07 2007-11-14 陶氏环球技术公司 应用可聚合络合试剂制备金属氰化物催化剂的方法
JP2007524719A (ja) * 2003-03-07 2007-08-30 ダウ グローバル テクノロジーズ インコーポレイティド ポリエーテルポリオール製造連続方法及びシステム
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
US9115246B2 (en) 2010-04-30 2015-08-25 Basf Se Polyether polyols, process for preparing polyether polyols and their use for producing polyurethanes
SG185102A1 (en) 2010-04-30 2012-12-28 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
KR20140043448A (ko) * 2011-06-29 2014-04-09 다우 글로벌 테크놀로지스 엘엘씨 열에 안정한 난연성 가요성 폴리우레탄 포옴
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
US3427256A (en) * 1963-02-14 1969-02-11 Gen Tire & Rubber Co Double metal cyanide complex compounds
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
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 (en) * 1980-10-16 1983-10-25 Gencorp Inc. Method for treating polypropylene ether and poly-1,2- butylene ether polyols
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
JPH05508833A (ja) * 1990-03-30 1993-12-09 オリン コーポレイション 触媒残査含有ポリオールから複金属シアン化物錯体触媒残査の除去方法
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
ZA965263B (en) 1997-01-09
KR970001292A (ko) 1997-01-24
HUP9601691A2 (en) 1997-04-28
US5563221A (en) 1996-10-08
ATE199094T1 (de) 2001-02-15
MX9602435A (es) 1997-02-28
TW322470B (hu) 1997-12-11
GR3035686T3 (en) 2001-06-29
EP0750001B1 (en) 2001-02-07
CN1090198C (zh) 2002-09-04
HU9601691D0 (en) 1996-08-28
CA2177871C (en) 2009-07-28
CA2177871A1 (en) 1996-12-22
RO117101B1 (ro) 2001-10-30
JPH093186A (ja) 1997-01-07
BR9602829A (pt) 1998-10-06
HU217692B (hu) 2000-03-28
KR100451872B1 (ko) 2004-12-04
DE69611743T2 (de) 2001-05-31
EP0750001A2 (en) 1996-12-27
AU5605796A (en) 1997-01-09
AU694874B2 (en) 1998-07-30
DE69611743D1 (de) 2001-03-15
AR002561A1 (es) 1998-03-25
CN1150582A (zh) 1997-05-28
EP0750001A3 (en) 1997-07-23
HUP9601691A3 (en) 1997-12-29
JP3247612B2 (ja) 2002-01-21
ES2153938T3 (es) 2001-03-16

Similar Documents

Publication Publication Date Title
DK0750001T3 (da) Fremgangsmåde til fremstilling af ethylenoxidafsluttede polyoler ud fra dobbeltmetalcyanidkatalyserede polyoler
EP0729940A3 (en) Process for the preparation of fluorinated nitriles
DE69626906D1 (de) Doppelmetallcyanidkatalysatorzusammensetzung enthaltend Polyetherpolyole
ZA987608B (en) Process for manufacture of superabsorbent-coated yarn
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.
ITTO991172A0 (it) Procedimento di purificazione biologica di un'acqua contenente perclor ato di ammonio.
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
EP0604092A3 (en) Improved process for the production of alkyl halosilanes.
HUP0103910A3 (en) Method for production of alpha,alpha-dimethylphenyl acetic acid from alpha,alpha-dimethyl benzyl cyanide
HUP9802860A3 (en) Process for the purification of diphenyl ether compounds
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 (de) Verfahren zur Herstellung von substituierten Chinazolin-2,4-dionen
FR2721028B1 (fr) Procédé de synthèse d'halogénoalkylferrocènes.
HK1036444A1 (en) Method of preparing allyl acetate by using catalyst for oxygen acylation reaction
KR970003376A (ko) 음극선관 보강용 밴드