HU208304B - Process for producing cypermethrin or cyfluthrin isomeric mixtures comprising the more effective isomers in an increased proportion - Google Patents
Process for producing cypermethrin or cyfluthrin isomeric mixtures comprising the more effective isomers in an increased proportion Download PDFInfo
- Publication number
- HU208304B HU208304B HU921627A HU162792A HU208304B HU 208304 B HU208304 B HU 208304B HU 921627 A HU921627 A HU 921627A HU 162792 A HU162792 A HU 162792A HU 208304 B HU208304 B HU 208304B
- Authority
- HU
- Hungary
- Prior art keywords
- cis
- trans
- alpha
- hydroxy
- phenoxyphenylacetonitrile
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 15
- 239000005946 Cypermethrin Substances 0.000 title claims abstract description 11
- KAATUXNTWXVJKI-UHFFFAOYSA-N cypermethrin Chemical compound CC1(C)C(C=C(Cl)Cl)C1C(=O)OC(C#N)C1=CC=CC(OC=2C=CC=CC=2)=C1 KAATUXNTWXVJKI-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 229960005424 cypermethrin Drugs 0.000 title claims abstract description 11
- QQODLKZGRKWIFG-QSFXBCCZSA-N cyfluthrin Chemical compound CC1(C)[C@@H](C=C(Cl)Cl)[C@H]1C(=O)O[C@@H](C#N)C1=CC=C(F)C(OC=2C=CC=CC=2)=C1 QQODLKZGRKWIFG-QSFXBCCZSA-N 0.000 title claims abstract description 8
- 229960001591 cyfluthrin Drugs 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title claims description 29
- 239000002253 acid Substances 0.000 claims abstract description 20
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 239000011541 reaction mixture Substances 0.000 claims abstract description 13
- GXUQMKBQDGPMKZ-UHFFFAOYSA-N 2-hydroxy-2-(3-phenoxyphenyl)acetonitrile Chemical compound N#CC(O)C1=CC=CC(OC=2C=CC=CC=2)=C1 GXUQMKBQDGPMKZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- SYSQUGFVNFXIIT-UHFFFAOYSA-N n-[4-(1,3-benzoxazol-2-yl)phenyl]-4-nitrobenzenesulfonamide Chemical class C1=CC([N+](=O)[O-])=CC=C1S(=O)(=O)NC1=CC=C(C=2OC3=CC=CC=C3N=2)C=C1 SYSQUGFVNFXIIT-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 4
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 4
- 238000009835 boiling Methods 0.000 claims abstract 2
- 238000006243 chemical reaction Methods 0.000 claims description 29
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 claims description 13
- -1 2,2-dichloroethenyl Chemical group 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 8
- 239000012298 atmosphere Substances 0.000 claims description 2
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims 3
- 238000010992 reflux Methods 0.000 abstract description 11
- 238000005406 washing Methods 0.000 abstract 1
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical class CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 28
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 16
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 7
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 7
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 7
- 239000011261 inert gas Substances 0.000 description 7
- HBAQYPYDRFILMT-UHFFFAOYSA-N 8-[3-(1-cyclopropylpyrazol-4-yl)-1H-pyrazolo[4,3-d]pyrimidin-5-yl]-3-methyl-3,8-diazabicyclo[3.2.1]octan-2-one Chemical class C1(CC1)N1N=CC(=C1)C1=NNC2=C1N=C(N=C2)N1C2C(N(CC1CC2)C)=O HBAQYPYDRFILMT-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- 239000012074 organic phase Substances 0.000 description 6
- DYLIWHYUXAJDOJ-OWOJBTEDSA-N (e)-4-(6-aminopurin-9-yl)but-2-en-1-ol Chemical compound NC1=NC=NC2=C1N=CN2C\C=C\CO DYLIWHYUXAJDOJ-OWOJBTEDSA-N 0.000 description 5
- 238000005886 esterification reaction Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000000749 insecticidal effect Effects 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- LLMLSUSAKZVFOA-UJURSFKZSA-N (1S,3R)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid Chemical compound CC1(C)[C@@H](C=C(Cl)Cl)[C@@H]1C(O)=O LLMLSUSAKZVFOA-UJURSFKZSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 230000032050 esterification Effects 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004811 liquid chromatography Methods 0.000 description 4
- 230000003389 potentiating effect Effects 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- CHLAOFANYRDCPD-UJURSFKZSA-N (1s,3r)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carbonyl chloride Chemical compound CC1(C)[C@@H](C=C(Cl)Cl)[C@@H]1C(Cl)=O CHLAOFANYRDCPD-UJURSFKZSA-N 0.000 description 3
- CHLAOFANYRDCPD-INEUFUBQSA-N (1s,3s)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carbonyl chloride Chemical compound CC1(C)[C@H](C=C(Cl)Cl)[C@@H]1C(Cl)=O CHLAOFANYRDCPD-INEUFUBQSA-N 0.000 description 3
- CHLAOFANYRDCPD-UHFFFAOYSA-N 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carbonyl chloride Chemical compound CC1(C)C(C=C(Cl)Cl)C1C(Cl)=O CHLAOFANYRDCPD-UHFFFAOYSA-N 0.000 description 3
- 239000008346 aqueous phase Substances 0.000 description 3
- ZOOSILUVXHVRJE-UHFFFAOYSA-N cyclopropanecarbonyl chloride Chemical class ClC(=O)C1CC1 ZOOSILUVXHVRJE-UHFFFAOYSA-N 0.000 description 3
- 239000002917 insecticide Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- GXUQMKBQDGPMKZ-CQSZACIVSA-N (2s)-2-hydroxy-2-(3-phenoxyphenyl)acetonitrile Chemical compound N#C[C@@H](O)C1=CC=CC(OC=2C=CC=CC=2)=C1 GXUQMKBQDGPMKZ-CQSZACIVSA-N 0.000 description 2
- FYIOXXUKFQPTJS-UHFFFAOYSA-N 2-(4-fluoro-3-phenoxyphenyl)-2-hydroxyacetonitrile Chemical compound N#CC(O)C1=CC=C(F)C(OC=2C=CC=CC=2)=C1 FYIOXXUKFQPTJS-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- VEMKTZHHVJILDY-UXHICEINSA-N bioresmethrin Chemical compound CC1(C)[C@H](C=C(C)C)[C@H]1C(=O)OCC1=COC(CC=2C=CC=CC=2)=C1 VEMKTZHHVJILDY-UXHICEINSA-N 0.000 description 2
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000002728 pyrethroid Substances 0.000 description 2
- OHAMOQALFCXZBV-UHFFFAOYSA-N 2,2-dichloroethenyl 2,2-dimethylcyclopropane-1-carboxylate Chemical compound CC1(C)CC1C(=O)OC=C(Cl)Cl OHAMOQALFCXZBV-UHFFFAOYSA-N 0.000 description 1
- BFNMOMYTTGHNGJ-UHFFFAOYSA-N 2,2-dimethylcyclopropane-1-carboxylic acid Chemical compound CC1(C)CC1C(O)=O BFNMOMYTTGHNGJ-UHFFFAOYSA-N 0.000 description 1
- LXXVVAQPCWSZJW-UHFFFAOYSA-N 2-hydroxy-2-phenoxy-2-phenylacetonitrile Chemical compound C=1C=CC=CC=1C(O)(C#N)OC1=CC=CC=C1 LXXVVAQPCWSZJW-UHFFFAOYSA-N 0.000 description 1
- 101100263837 Bovine ephemeral fever virus (strain BB7721) beta gene Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 101100316840 Enterobacteria phage P4 Beta gene Proteins 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 241000256244 Heliothis virescens Species 0.000 description 1
- 241000255908 Manduca sexta Species 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000010936 aqueous wash Methods 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- YMGUBTXCNDTFJI-UHFFFAOYSA-M cyclopropanecarboxylate Chemical compound [O-]C(=O)C1CC1 YMGUBTXCNDTFJI-UHFFFAOYSA-M 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 229910000039 hydrogen halide Inorganic materials 0.000 description 1
- 239000012433 hydrogen halide Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 239000006187 pill Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C255/00—Carboxylic acid nitriles
- C07C255/01—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms
- C07C255/32—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms having cyano groups bound to acyclic carbon atoms of a carbon skeleton containing at least one six-membered aromatic ring
- C07C255/38—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms having cyano groups bound to acyclic carbon atoms of a carbon skeleton containing at least one six-membered aromatic ring the carbon skeleton being further substituted by esterified hydroxy groups
- C07C255/39—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms having cyano groups bound to acyclic carbon atoms of a carbon skeleton containing at least one six-membered aromatic ring the carbon skeleton being further substituted by esterified hydroxy groups with hydroxy groups esterified by derivatives of 2,2-dimethylcyclopropane carboxylic acids, e.g. of chrysanthemumic acids
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C253/00—Preparation of carboxylic acid nitriles
- C07C253/30—Preparation of carboxylic acid nitriles by reactions not involving the formation of cyano groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Instrument Panels (AREA)
- Digital Computer Display Output (AREA)
- Controls And Circuits For Display Device (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/438,657 US5028731A (en) | 1989-11-17 | 1989-11-17 | Preparation of mixtures of cypermethrin or cyfluthrin isomers enriched in more active species |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| HU9201627D0 HU9201627D0 (en) | 1993-04-28 |
| HUT62554A HUT62554A (en) | 1993-05-28 |
| HU208304B true HU208304B (en) | 1993-09-28 |
Family
ID=23741488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| HU921627A HU208304B (en) | 1989-11-17 | 1990-10-01 | Process for producing cypermethrin or cyfluthrin isomeric mixtures comprising the more effective isomers in an increased proportion |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US5028731A (https=) |
| EP (1) | EP0500572B1 (https=) |
| JP (1) | JPH0662536B2 (https=) |
| KR (1) | KR940011906B1 (https=) |
| BR (1) | BR9007850A (https=) |
| CA (1) | CA2068532C (https=) |
| DE (1) | DE69025478T2 (https=) |
| DK (1) | DK0500572T3 (https=) |
| ES (1) | ES2085916T3 (https=) |
| HU (1) | HU208304B (https=) |
| IL (1) | IL96298A (https=) |
| MX (1) | MX171955B (https=) |
| RU (1) | RU2060990C1 (https=) |
| TR (1) | TR25423A (https=) |
| TW (1) | TW200447B (https=) |
| WO (1) | WO1991007379A1 (https=) |
| ZA (1) | ZA908570B (https=) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1275108A (en) * | 1985-01-16 | 1990-10-09 | Laszlo Pap | Insecticidal composition comprising more than one active ingredients |
| US5164411A (en) * | 1991-01-25 | 1992-11-17 | Fmc Corporation | Pyrethroid compositions |
| US8153145B2 (en) * | 2005-12-22 | 2012-04-10 | Fmc Corporation | Formulations of bifenthrin and enriched cypermethrin |
| US20120301532A1 (en) * | 2011-05-26 | 2012-11-29 | Allergy Technologies, Llc | Compositions and methods for treating materials with insecticides and potentiating agents |
| WO2019145221A1 (en) | 2018-01-29 | 2019-08-01 | BASF Agro B.V. | New agrochemical formulations |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2769835A (en) * | 1953-12-09 | 1956-11-06 | Monsanto Chemicals | Process of producing alkyl acrylates by dehydrohalogenation using an anhydrous calcium sulfate catalyst |
| US3078306A (en) * | 1958-04-24 | 1963-02-19 | Basf Ag | Process for the production of alphachloroximes and their hydrochlorides |
| US3082236A (en) * | 1959-04-29 | 1963-03-19 | Wallace & Tiernan Inc | Peroxy esters of p-menthane hydroperoxides |
| US4024163A (en) * | 1972-05-25 | 1977-05-17 | National Research Development Corporation | Insecticides |
| DE2850502A1 (de) * | 1977-11-24 | 1979-05-31 | Ciba Geigy Ag | 2,4,4,4-tetrachlorbuttersaeure-1,2,4, 4,4-pentachlor-but-1-enylester |
| DE2928986A1 (de) * | 1979-07-18 | 1981-02-05 | Bayer Ag | (+)-cis und (+) trans-2,2-dimethyl- 3-(2,2-dichlor-vinyl)-cyclopropan-1- carbonsaeure-(+-) - alpha -cyano-3-phenoxy4-fluor-benzylester, verfahren zu ihrer herstellung sowie ihre verwendung als insektizide und akarizide |
| FR2471369A1 (fr) * | 1979-12-17 | 1981-06-19 | Roussel Uclaf | Nouvelles imines, derivant d'esters d'acides formyl cyclopropane carboxyliques, leur procede de preparation et leur application a la preparation d'esters insecticides |
| DE3200484A1 (de) * | 1982-01-09 | 1983-07-21 | Bayer Ag, 5090 Leverkusen | Aminoalkylester, verfahren zu ihrer herstellung und ihre verwendung in schaedlingsbekaempfungsmittel |
| JPS60202843A (ja) * | 1984-03-27 | 1985-10-14 | Sumitomo Chem Co Ltd | エステル誘導体の合成方法 |
| JP2982339B2 (ja) * | 1991-02-25 | 1999-11-22 | ソニー株式会社 | 光ディスクカートリッジと光ディスク装置 |
-
1989
- 1989-11-17 US US07/438,657 patent/US5028731A/en not_active Expired - Lifetime
-
1990
- 1990-10-01 ES ES90915553T patent/ES2085916T3/es not_active Expired - Lifetime
- 1990-10-01 CA CA002068532A patent/CA2068532C/en not_active Expired - Fee Related
- 1990-10-01 KR KR1019920701159A patent/KR940011906B1/ko not_active Expired - Fee Related
- 1990-10-01 EP EP90915553A patent/EP0500572B1/en not_active Expired - Lifetime
- 1990-10-01 JP JP2514365A patent/JPH0662536B2/ja not_active Expired - Lifetime
- 1990-10-01 BR BR909007850A patent/BR9007850A/pt not_active IP Right Cessation
- 1990-10-01 RU SU905052420A patent/RU2060990C1/ru not_active IP Right Cessation
- 1990-10-01 DE DE69025478T patent/DE69025478T2/de not_active Expired - Fee Related
- 1990-10-01 WO PCT/US1990/005578 patent/WO1991007379A1/en not_active Ceased
- 1990-10-01 HU HU921627A patent/HU208304B/hu unknown
- 1990-10-01 DK DK90915553.3T patent/DK0500572T3/da active
- 1990-10-23 TW TW079108928A patent/TW200447B/zh active
- 1990-10-25 ZA ZA908570A patent/ZA908570B/xx unknown
- 1990-11-09 IL IL9629890A patent/IL96298A/en not_active IP Right Cessation
- 1990-11-14 TR TR90/1096A patent/TR25423A/xx unknown
- 1990-11-16 MX MX023375A patent/MX171955B/es unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE69025478D1 (de) | 1996-03-28 |
| HU9201627D0 (en) | 1993-04-28 |
| IL96298A (en) | 1995-10-31 |
| US5028731A (en) | 1991-07-02 |
| TW200447B (https=) | 1993-02-21 |
| KR920703518A (ko) | 1992-12-18 |
| JPH05501110A (ja) | 1993-03-04 |
| EP0500572A4 (en) | 1992-10-07 |
| KR940011906B1 (ko) | 1994-12-27 |
| WO1991007379A1 (en) | 1991-05-30 |
| BR9007850A (pt) | 1992-10-06 |
| EP0500572A1 (en) | 1992-09-02 |
| MX171955B (es) | 1993-11-24 |
| IL96298A0 (en) | 1991-08-16 |
| DE69025478T2 (de) | 1996-10-24 |
| CA2068532C (en) | 1995-05-16 |
| DK0500572T3 (da) | 1996-06-24 |
| RU2060990C1 (ru) | 1996-05-27 |
| ES2085916T3 (es) | 1996-06-16 |
| JPH0662536B2 (ja) | 1994-08-17 |
| TR25423A (tr) | 1993-03-01 |
| CA2068532A1 (en) | 1991-05-18 |
| EP0500572B1 (en) | 1996-02-21 |
| ZA908570B (en) | 1991-08-28 |
| HUT62554A (en) | 1993-05-28 |
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