HU182226B - Process for preparing 5-/halo-phenyl/-salicylic acid derivatives - Google Patents
Process for preparing 5-/halo-phenyl/-salicylic acid derivatives Download PDFInfo
- Publication number
- HU182226B HU182226B HU802621A HU262180A HU182226B HU 182226 B HU182226 B HU 182226B HU 802621 A HU802621 A HU 802621A HU 262180 A HU262180 A HU 262180A HU 182226 B HU182226 B HU 182226B
- Authority
- HU
- Hungary
- Prior art keywords
- palladium
- ligand
- formula
- salicylic acid
- catalyst
- Prior art date
Links
- 229940058287 salicylic acid derivative anticestodals Drugs 0.000 title claims description 9
- 125000005059 halophenyl group Chemical group 0.000 title description 10
- 238000004519 manufacturing process Methods 0.000 title description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000003054 catalyst Substances 0.000 claims abstract description 53
- 239000003446 ligand Substances 0.000 claims abstract description 45
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000002253 acid Substances 0.000 claims abstract description 17
- 150000001875 compounds Chemical class 0.000 claims abstract description 5
- -1 halogen benzene compounds Chemical class 0.000 claims description 16
- 238000002360 preparation method Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 229910052736 halogen Inorganic materials 0.000 claims description 9
- 150000002367 halogens Chemical class 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 230000007062 hydrolysis Effects 0.000 claims description 4
- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 239000000460 chlorine Substances 0.000 claims description 3
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 3
- 229910052731 fluorine Chemical group 0.000 claims description 3
- 125000001153 fluoro group Chemical group F* 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 150000003902 salicylic acid esters Chemical class 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 2
- 229910001508 alkali metal halide Inorganic materials 0.000 claims 1
- 238000006555 catalytic reaction Methods 0.000 claims 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 abstract description 7
- 239000002904 solvent Substances 0.000 abstract description 7
- 230000008929 regeneration Effects 0.000 abstract description 6
- 238000011069 regeneration method Methods 0.000 abstract description 6
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 abstract description 3
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 abstract description 3
- 125000001475 halogen functional group Chemical group 0.000 abstract 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 14
- YGSDEFSMJLZEOE-UHFFFAOYSA-N Salicylic acid Natural products OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 239000000047 product Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 229960004889 salicylic acid Drugs 0.000 description 9
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 8
- OSWPMRLSEDHDFF-UHFFFAOYSA-N methyl salicylate Chemical compound COC(=O)C1=CC=CC=C1O OSWPMRLSEDHDFF-UHFFFAOYSA-N 0.000 description 6
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 description 6
- 150000003872 salicylic acid derivatives Chemical class 0.000 description 6
- UEMGWPRHOOEKTA-UHFFFAOYSA-N 1,3-difluorobenzene Chemical compound FC1=CC=CC(F)=C1 UEMGWPRHOOEKTA-UHFFFAOYSA-N 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 5
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 5
- HUPFGZXOMWLGNK-UHFFFAOYSA-N diflunisal Chemical compound C1=C(O)C(C(=O)O)=CC(C=2C(=CC(F)=CC=2)F)=C1 HUPFGZXOMWLGNK-UHFFFAOYSA-N 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 239000007858 starting material Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 4
- 125000005907 alkyl ester group Chemical group 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 238000005691 oxidative coupling reaction Methods 0.000 description 4
- 239000001632 sodium acetate Substances 0.000 description 4
- 235000017281 sodium acetate Nutrition 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- HCJMNOSIAGSZBM-UHFFFAOYSA-N 6-methylsalicylic acid Chemical compound CC1=CC=CC(O)=C1C(O)=O HCJMNOSIAGSZBM-UHFFFAOYSA-N 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011541 reaction mixture Substances 0.000 description 3
- NIVHKXRXDPNABT-UHFFFAOYSA-N 5-(2,4-difluorophenyl)-2-methoxybenzoic acid Chemical compound C1=C(C(O)=O)C(OC)=CC=C1C1=CC=C(F)C=C1F NIVHKXRXDPNABT-UHFFFAOYSA-N 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 150000005171 halobenzenes Chemical class 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- QMPIMDAYFIIMIH-UHFFFAOYSA-N methyl 5-(2,4-difluorophenyl)-2-hydroxybenzoate Chemical compound C1=C(O)C(C(=O)OC)=CC(C=2C(=CC(F)=CC=2)F)=C1 QMPIMDAYFIIMIH-UHFFFAOYSA-N 0.000 description 2
- 150000002940 palladium Chemical class 0.000 description 2
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- IIEADPHIKASKSV-UHFFFAOYSA-N (2,3,4,5,6-pentafluorophenyl) propanoate Chemical compound CCC(=O)OC1=C(F)C(F)=C(F)C(F)=C1F IIEADPHIKASKSV-UHFFFAOYSA-N 0.000 description 1
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 description 1
- XHAXVDWUMCHTCY-UHFFFAOYSA-N 2,2,2-trichloroethyl acetate Chemical compound CC(=O)OCC(Cl)(Cl)Cl XHAXVDWUMCHTCY-UHFFFAOYSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- DTQVDTLACAAQTR-UHFFFAOYSA-M Trifluoroacetate Chemical compound [O-]C(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-M 0.000 description 1
- WJGAPUXHSQQWQF-UHFFFAOYSA-N acetic acid;hydrochloride Chemical compound Cl.CC(O)=O WJGAPUXHSQQWQF-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000000730 antalgic agent Substances 0.000 description 1
- 239000002260 anti-inflammatory agent Substances 0.000 description 1
- 230000003110 anti-inflammatory effect Effects 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- 229960001047 methyl salicylate Drugs 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- ZVSLRJWQDNRUDU-UHFFFAOYSA-L palladium(2+);propanoate Chemical compound [Pd+2].CCC([O-])=O.CCC([O-])=O ZVSLRJWQDNRUDU-UHFFFAOYSA-L 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 150000003870 salicylic acids Chemical class 0.000 description 1
- QSUJAUYJBJRLKV-UHFFFAOYSA-M tetraethylazanium;fluoride Chemical compound [F-].CC[N+](CC)(CC)CC QSUJAUYJBJRLKV-UHFFFAOYSA-M 0.000 description 1
- YTWOHSWDLJUCRK-UHFFFAOYSA-N thiolane 1,1-dioxide Chemical compound O=S1(=O)CCCC1.O=S1(=O)CCCC1 YTWOHSWDLJUCRK-UHFFFAOYSA-N 0.000 description 1
- 239000012485 toluene extract Substances 0.000 description 1
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/09—Preparation of carboxylic acids or their salts, halides or anhydrides from carboxylic acid esters or lactones
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Catalysts (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/090,792 US4237315A (en) | 1979-11-02 | 1979-11-02 | Preparation of 5(halophenyl)salicylic acid compounds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| HU182226B true HU182226B (en) | 1983-12-28 |
Family
ID=22224332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| HU802621A HU182226B (en) | 1979-11-02 | 1980-10-30 | Process for preparing 5-/halo-phenyl/-salicylic acid derivatives |
Country Status (23)
| Country | Link |
|---|---|
| US (1) | US4237315A (OSRAM) |
| EP (1) | EP0028407B1 (OSRAM) |
| JP (1) | JPS5935909B2 (OSRAM) |
| AR (1) | AR229020A1 (OSRAM) |
| AT (1) | ATE4587T1 (OSRAM) |
| AU (1) | AU530586B2 (OSRAM) |
| CA (1) | CA1149410A (OSRAM) |
| CS (1) | CS221934B2 (OSRAM) |
| DD (1) | DD153681A5 (OSRAM) |
| DE (1) | DE3064774D1 (OSRAM) |
| DK (1) | DK156564C (OSRAM) |
| ES (1) | ES496444A0 (OSRAM) |
| FI (1) | FI68610C (OSRAM) |
| GR (1) | GR70785B (OSRAM) |
| HU (1) | HU182226B (OSRAM) |
| IE (1) | IE50334B1 (OSRAM) |
| NO (1) | NO152555C (OSRAM) |
| NZ (1) | NZ195304A (OSRAM) |
| PL (1) | PL126701B1 (OSRAM) |
| PT (1) | PT71978B (OSRAM) |
| SU (1) | SU1075971A3 (OSRAM) |
| YU (1) | YU41949B (OSRAM) |
| ZA (1) | ZA806723B (OSRAM) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4355174A (en) * | 1979-11-02 | 1982-10-19 | Merck & Co., Inc. | Preparation of 5(halophenyl)salicylic acid compounds |
| IT1190926B (it) * | 1982-07-22 | 1988-02-24 | Zambon Spa | Procedimento per preparare l'acido 2',4'-difluoro-4-idrossi-(1,1'-difenil)-3-carbossilico |
| IT1250736B (it) * | 1991-08-01 | 1995-04-21 | Zambon Spa | Processo per la preparazione dell'acido 5-(2',4'-difluorofenil) salicilico in forma ii pura |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL30496A0 (en) * | 1967-08-14 | 1968-10-24 | Merck & Co Inc | Process for the preparation of phenyl salicylic acid compounds and intermediates used therein |
| IL30498A0 (en) * | 1967-08-14 | 1968-10-24 | Merck & Co Inc | Process for the preparation of phenyl salicylic acid compounds and intermediates used therein |
| US3632831A (en) * | 1969-01-03 | 1972-01-04 | Du Pont | Synthesis of dialkyl 4 4'-biphenyldicarboxylates |
-
1979
- 1979-11-02 US US06/090,792 patent/US4237315A/en not_active Expired - Lifetime
-
1980
- 1980-10-20 FI FI803293A patent/FI68610C/fi not_active IP Right Cessation
- 1980-10-20 NZ NZ195304A patent/NZ195304A/xx unknown
- 1980-10-21 AU AU63550/80A patent/AU530586B2/en not_active Ceased
- 1980-10-21 CS CS807122A patent/CS221934B2/cs unknown
- 1980-10-22 YU YU2701/80A patent/YU41949B/xx unknown
- 1980-10-27 DD DD80224759A patent/DD153681A5/de not_active IP Right Cessation
- 1980-10-27 PT PT71978A patent/PT71978B/pt not_active IP Right Cessation
- 1980-10-28 CA CA000363415A patent/CA1149410A/en not_active Expired
- 1980-10-30 GR GR63251A patent/GR70785B/el unknown
- 1980-10-30 PL PL1980227576A patent/PL126701B1/pl unknown
- 1980-10-30 HU HU802621A patent/HU182226B/hu unknown
- 1980-10-31 AR AR283086A patent/AR229020A1/es active
- 1980-10-31 JP JP55152379A patent/JPS5935909B2/ja not_active Expired
- 1980-10-31 EP EP80106705A patent/EP0028407B1/en not_active Expired
- 1980-10-31 NO NO803255A patent/NO152555C/no unknown
- 1980-10-31 DE DE8080106705T patent/DE3064774D1/de not_active Expired
- 1980-10-31 SU SU802999196A patent/SU1075971A3/ru active
- 1980-10-31 ZA ZA00806723A patent/ZA806723B/xx unknown
- 1980-10-31 ES ES496444A patent/ES496444A0/es active Granted
- 1980-10-31 DK DK462180A patent/DK156564C/da not_active IP Right Cessation
- 1980-10-31 AT AT80106705T patent/ATE4587T1/de active
- 1980-10-31 IE IE2261/80A patent/IE50334B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| AR229020A1 (es) | 1983-05-31 |
| JPS5935909B2 (ja) | 1984-08-31 |
| FI68610C (fi) | 1985-10-10 |
| PT71978A (en) | 1980-11-01 |
| PL227576A1 (OSRAM) | 1981-06-19 |
| NO152555C (no) | 1985-10-16 |
| DE3064774D1 (en) | 1983-10-13 |
| EP0028407A1 (en) | 1981-05-13 |
| ES8107147A1 (es) | 1981-10-01 |
| PT71978B (en) | 1982-03-31 |
| CS221934B2 (en) | 1983-04-29 |
| US4237315A (en) | 1980-12-02 |
| YU270180A (en) | 1983-01-21 |
| SU1075971A3 (ru) | 1984-02-23 |
| PL126701B1 (en) | 1983-08-31 |
| DK462180A (da) | 1981-05-03 |
| DK156564B (da) | 1989-09-11 |
| ATE4587T1 (de) | 1983-09-15 |
| GR70785B (OSRAM) | 1983-03-23 |
| NO152555B (no) | 1985-07-08 |
| AU530586B2 (en) | 1983-07-21 |
| YU41949B (en) | 1988-02-29 |
| FI803293L (fi) | 1981-05-03 |
| DK156564C (da) | 1990-02-12 |
| AU6355080A (en) | 1981-08-20 |
| FI68610B (fi) | 1985-06-28 |
| NZ195304A (en) | 1982-12-07 |
| NO803255L (no) | 1981-05-04 |
| IE50334B1 (en) | 1986-04-02 |
| ZA806723B (en) | 1982-06-30 |
| CA1149410A (en) | 1983-07-05 |
| ES496444A0 (es) | 1981-10-01 |
| IE802261L (en) | 1981-05-02 |
| EP0028407B1 (en) | 1983-09-07 |
| DD153681A5 (de) | 1982-01-27 |
| JPS5690037A (en) | 1981-07-21 |
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