[go: up one dir, main page]

IT8048189A0 - Isomeri geometrici di 1-sostituiti -1-triazolilstireni aventi attivi ta' fungicida diserbante e regolatrice della crescita delle piante eprocedimento per la loro preparazione - Google Patents

Isomeri geometrici di 1-sostituiti -1-triazolilstireni aventi attivi ta' fungicida diserbante e regolatrice della crescita delle piante eprocedimento per la loro preparazione

Info

Publication number
IT8048189A0
IT8048189A0 IT8048189A IT4818980A IT8048189A0 IT 8048189 A0 IT8048189 A0 IT 8048189A0 IT 8048189 A IT8048189 A IT 8048189A IT 4818980 A IT4818980 A IT 4818980A IT 8048189 A0 IT8048189 A0 IT 8048189A0
Authority
IT
Italy
Prior art keywords
procedure
triazolylstyrenes
herbicide
substituted
preparation
Prior art date
Application number
IT8048189A
Other languages
English (en)
Other versions
IT1143014B (it
Inventor
Funaki Yuji
Oshita Hirofumi
Yamamoto Shigeo
Tanaka Shizuya
Kato Toshiro
Original Assignee
Sumitomo Chemical Co
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
Priority claimed from JP3287679A external-priority patent/JPS55124771A/ja
Priority claimed from JP4165979A external-priority patent/JPS55147265A/ja
Priority claimed from JP10054779A external-priority patent/JPS5625105A/ja
Priority claimed from JP11657679A external-priority patent/JPS5640671A/ja
Priority claimed from JP12236679A external-priority patent/JPS5645462A/ja
Priority claimed from JP12348579A external-priority patent/JPS5646869A/ja
Priority claimed from JP12457179A external-priority patent/JPS5646870A/ja
Priority claimed from JP1056880A external-priority patent/JPS56108773A/ja
Application filed by Sumitomo Chemical Co filed Critical Sumitomo Chemical Co
Publication of IT8048189A0 publication Critical patent/IT8048189A0/it
Application granted granted Critical
Publication of IT1143014B publication Critical patent/IT1143014B/it

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D231/00Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
    • C07D231/02Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
    • C07D231/10Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D231/12Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/64Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with three nitrogen atoms as the only ring hetero atoms
    • A01N43/647Triazoles; Hydrogenated triazoles
    • A01N43/6531,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D249/00Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
    • C07D249/02Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms not condensed with other rings
    • C07D249/081,2,4-Triazoles; Hydrogenated 1,2,4-triazoles

Landscapes

  • Organic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Plant Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Agronomy & Crop Science (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
IT48189/80A 1979-03-20 1980-03-18 Isomeri geometrici di 1-sostituiti-1-triazolistireni aventi attivita' fungicida diserbante e regolatrice della crescita delle piante e procedimento per la loro preparazione IT1143014B (it)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP3287679A JPS55124771A (en) 1979-03-20 1979-03-20 Triazole-based geometrical isomerism compound or its salt, its preparation, and fungicide for agriculture and gardening comprising it as active ingredient
JP4165979A JPS55147265A (en) 1979-04-05 1979-04-05 Triazole geometrical isomer compound and its preparation
JP10054779A JPS5625105A (en) 1979-08-06 1979-08-06 Plant growth regulator and herbicide containing geometrical isomer of triazole compound or its salt as effective component
JP11657679A JPS5640671A (en) 1979-09-10 1979-09-10 Triazole compound or its salt, its preparation and agricultural and horticultural germicide, herbicide and plant growth regulator containing the same as active constituent
JP12236679A JPS5645462A (en) 1979-09-21 1979-09-21 Triazole compound and its preparation
JP12348579A JPS5646869A (en) 1979-09-25 1979-09-25 Geometrical isomer of triazole compound or its salt, its preparation, and agricultural and horticultural fungicide, plant growth regulating agent, and herbicide containing the same as effective component
JP12457179A JPS5646870A (en) 1979-09-26 1979-09-26 Geometrical isomer of triazole compound and its preparation
JP1056880A JPS56108773A (en) 1980-01-30 1980-01-30 Triazole compound and its salt, their preparation, and fungicide, herbicide, and plant growth regulating agent containing said compound as effective component

Publications (2)

Publication Number Publication Date
IT8048189A0 true IT8048189A0 (it) 1980-03-18
IT1143014B IT1143014B (it) 1986-10-22

Family

ID=27571676

Family Applications (1)

Application Number Title Priority Date Filing Date
IT48189/80A IT1143014B (it) 1979-03-20 1980-03-18 Isomeri geometrici di 1-sostituiti-1-triazolistireni aventi attivita' fungicida diserbante e regolatrice della crescita delle piante e procedimento per la loro preparazione

Country Status (19)

Country Link
US (2) US4554007A (it)
AR (1) AR226305A1 (it)
AU (1) AU536825B2 (it)
BR (1) BR8001617A (it)
CA (1) CA1154449A (it)
CH (1) CH644851A5 (it)
DE (1) DE3010560A1 (it)
DK (1) DK157811C (it)
FR (1) FR2460939B1 (it)
GB (1) GB2046260B (it)
HU (1) HU186281B (it)
IL (1) IL59671A (it)
IT (1) IT1143014B (it)
LV (1) LV10023B (it)
MY (1) MY8700898A (it)
NL (1) NL192791C (it)
NZ (1) NZ193168A (it)
PL (1) PL123010B1 (it)
YU (1) YU42969B (it)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044425B1 (de) * 1980-07-03 1985-09-18 Bayer Ag Halogenierte Triazolylvinyl-keto- und -carbinol-Derivate, Verfahren zu ihrer Herstellung sowie ihre Verwendung als Pflanzenwachstumsregulatoren und Fungizide
EP0123971A2 (de) * 1980-07-25 1984-11-07 Bayer Ag Triazolylpropenol-Derivate, Verfahren zu ihrer Herstellung sowie ihre Verwendung als Pflanzenwachstumsregulatoren und Fungizide
DE3044801A1 (de) * 1980-11-28 1982-07-01 Bayer Ag, 5090 Leverkusen Antimikrobielle mittel
DE3044802A1 (de) * 1980-11-28 1982-07-01 Bayer Ag, 5090 Leverkusen Substituierte 1-phenyl-2-triazolyl-1-penten-3-ole, verfahren zu ihrer herstellung sowie ihre verwendung als pflanzenwachstumsregulatoren und fungizide
EP0175278A3 (en) * 1980-12-15 1986-12-30 Sumitomo Chemical Company, Limited Optical isomer of triazolylpentenols, and their production and use as fungicide herbicide and/or plant growth regulant
EP0427168B1 (en) * 1980-12-15 1996-03-13 Sumitomo Chemical Company, Limited Optical isomer of triazolylpentenols, and their production and use as fungicide, herbicide and/or plant growth regulant
AU544099B2 (en) * 1980-12-15 1985-05-16 Sumitomo Chemical Company, Limited Triazolylpentenols
JPS57154172A (en) * 1981-03-16 1982-09-22 Sumitomo Chem Co Ltd Preparation of triazolylvinyl ketone type geometrical isomer
DE3145857A1 (de) * 1981-11-19 1983-05-26 Bayer Ag, 5090 Leverkusen Alkylcyloalkyl-triazolylmethyl-ketone und verfahreen zu ihrer herstellung
DE3148742A1 (de) * 1981-12-04 1983-06-09 Schering Ag, 1000 Berlin Und 4619 Bergkamen Azolyl-penten-derivate, verfahren zur herstellung dieser verbindungen sowie diese enthaltende biozide mittel
DE3208142A1 (de) * 1982-03-06 1983-09-08 Bayer Ag, 5090 Leverkusen Fungizide mittel
JPS58183602A (ja) * 1982-04-20 1983-10-26 Sumitomo Chem Co Ltd 農園芸用殺菌組成物
PH18026A (en) * 1982-04-22 1985-03-03 Sumitomo Chemical Co A fungicidal composition
AU554648B2 (en) * 1982-05-27 1986-08-28 Sumitomo Chemical Company, Limited Fungicidal composition comprising
DE3231205A1 (de) * 1982-08-21 1984-03-01 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von e-isomeren von 1-cyclohexyl-2-(1,2,4-triazol-1-yl)-1-penten-3-on-derivaten
US5041651A (en) * 1983-04-04 1991-08-20 Sumitomo Chemical Company, Limited Asymmetrically modified boron hydride type compound and a method for producing an optically active alcohol derivative by the use thereof
HU200755B (en) * 1983-04-04 1990-08-28 Sumitomo Chemical Co. Ltd.,Jp Process for producing optically active alcohol derivatives by using asymmetrically modified compounds of boron hydride type
JPS59204105A (ja) * 1983-05-02 1984-11-19 Sumitomo Chem Co Ltd 植物成長抑制剤組成物
CA1233659A (en) * 1983-05-06 1988-03-08 Sumitomo Chemical Company, Limited Composition for regulating plant growth
CA1249832A (en) * 1984-02-03 1989-02-07 Shionogi & Co., Ltd. Azolyl cycloalkanol derivatives and agricultural fungicides
EP0178325B1 (en) * 1984-04-03 1992-04-22 Sumitomo Chemical Company, Limited Boron hydride type compounds and their use in a method for producing optically active alpha,beta unsaturated alcohols
JPS6118790A (ja) * 1984-07-05 1986-01-27 Sumitomo Chem Co Ltd 光学活性ボラン錯体およびその製造法
DE3576272D1 (de) * 1984-12-14 1990-04-12 Sumitomo Chemical Co Verfahren zur regulierung des wachstums von tulpen.
FR2584892A1 (fr) * 1985-07-18 1987-01-23 Rhone Poulenc Agrochimie Procede de regulation de croissance des plantes de colza
JPS62226966A (ja) * 1986-03-28 1987-10-05 Sumitomo Chem Co Ltd トリアゾ−ル誘導体のe−異性体の製造方法
AU604499B2 (en) * 1986-09-25 1990-12-20 Sumitomo Chemical Company, Limited Seed disinfectant composition
US4940722A (en) * 1986-12-10 1990-07-10 Sumitomo Chemical Companmy, Limited Seed disinfectant composition
JP3069665B2 (ja) * 1990-03-15 2000-07-24 住友化学工業株式会社 農業用粒状水和剤組成物
NZ243977A (en) * 1991-09-13 1995-03-28 Sumitomo Chemical Co Wood preservative containing styryl triazole derivative; wood treatment
ES2127830T3 (es) * 1992-08-07 1999-05-01 Dow Agrosciences Llc Metodo para controlar el crecimiento de un arbol.
JP3586895B2 (ja) * 1994-08-24 2004-11-10 住友化学工業株式会社 ダイズの増収方法
CN1074250C (zh) * 1999-03-17 2001-11-07 李卫国 烯唑醇乳液防治香蕉叶斑病的应用
CN102123587B (zh) * 2008-05-13 2014-07-30 克斯莫石油株式会社 草坪草的品质提高剂
JP5165154B2 (ja) * 2010-04-27 2013-03-21 日本製紙株式会社 細胞分化促進剤およびその用途
BR112013015623B1 (pt) 2010-12-21 2021-11-16 Bayer Cropscience Lp Composição, seu uso, uso de células mutantes para swra, e método de tratamento de uma planta para melhorar o crescimento da planta, promover a saúde da planta ou controlar uma doença de planta
EP2755485A1 (en) 2011-09-12 2014-07-23 Bayer Cropscience LP Methods of enhancing health and/or promoting growth of a plant and/or of improving fruit ripening
CN103058943B (zh) * 2013-01-08 2015-05-06 河南师范大学 具有抑菌活性的烯唑醇-1,2,3-三氮唑类化合物及其制备方法
CN104557888B (zh) * 2015-01-23 2017-02-15 邵阳学院 呋喃酚丙烯醇衍生物作为除草剂的应用
MD4519C1 (ro) * 2016-12-21 2018-05-31 Институт Химии Академии Наук Молдовы Utilizare a (Z)-4,4-dimetil-1-(4-nitrofenil)-2-(1H-1,2,4-triazol-1-il)pent-1-en-3-onei în calitate de remediu antituberculos
MD4515C1 (ro) * 2016-12-21 2018-04-30 Институт Химии Академии Наук Молдовы Procedeu de obţinere a (Z)-4,4-dimetil-1-(4-nitrofenil)-2-(1H-1,2,4-triazol-1-il)pent-1-en-3-onei
MD4505C1 (ro) * 2016-12-21 2018-03-31 Институт Химии Академии Наук Молдовы Procedeu de sinteză a 3,3-dimetil-1-(1H-1,2,4-triazol-1-il)butan-2-onei
CN107098865A (zh) * 2017-06-25 2017-08-29 盐城利民农化有限公司 一种烯唑醇的合成工艺

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201466A (en) * 1963-03-08 1965-08-17 Gulf Oil Corp Substituted cyclopropanecarboxanilide herbicides
GB1407798A (en) * 1971-12-31 1975-09-24 Boots Co Ltd Substituted 1,2,5-triazoles
US3830642A (en) * 1971-04-28 1974-08-20 Upjohn Co Method for controlling weeds with 1{40 -formyl-1{40 -halobenzeneazomethanes and formulations therefor
US3912752A (en) * 1972-01-11 1975-10-14 Bayer Ag 1-Substituted-1,2,4-triazoles
DE2431407C2 (de) * 1974-06-29 1982-12-02 Bayer Ag, 5090 Leverkusen 1,2,4-Triazol-1-yl-alkanone und -alkanole, Verfahren zu ihrer Herstellung sowie ihre Verwendung als Fungizide
GB1533705A (en) * 1975-03-10 1978-11-29 Ici Ltd Method of combating fungal infections in plants using imidazoles and 1,2,4-triazoles
US4079143A (en) * 1975-08-26 1978-03-14 Imperial Chemical Industries Limited Fungicidal 1H-1,2,4-triazoles
GB1504352A (en) * 1975-10-09 1978-03-22 Ici Ltd Alpha-(1,2,4-triazolyl or imidazolyl)-acetophenones and their use as pesticides
US4086351A (en) * 1975-10-09 1978-04-25 Imperial Chemical Industries Limited 1,2,4-Triazole-containing compounds and their use as pesticides
IE43731B1 (en) * 1975-10-09 1981-05-26 Ici Ltd A-(1,2,4-triazolyl or imidazolyl)-acetophenones and their use as pesticides
US4009021A (en) * 1975-10-30 1977-02-22 Rohm And Haas Company Imidazole plant growth regulators
GB1529818A (en) * 1975-12-03 1978-10-25 Ici Ltd 1,2,4-triazolyl alkanols and their use as pesticides
US4073925A (en) * 1975-12-12 1978-02-14 Imperial Chemical Industries Limited Fungicidally effective imidazoles and use thereof against fungal pests
JPS52130661A (en) * 1976-04-27 1977-11-02 Nittetsu Mining Co Ltd Apparatus for measuring level within tank
ZA774497B (en) * 1976-07-29 1978-06-28 Ici Ltd Processes and compositions for combating fungi
IE45765B1 (en) * 1976-08-19 1982-11-17 Ici Ltd Triazoles and imidazoles useful as plant fungicides and growth regulating agents
DE2738725A1 (de) * 1977-08-27 1979-03-08 Basf Ag Azolylalkohole
DE2738847A1 (de) * 1977-08-29 1979-03-15 Albrecht W Gaspard Geraet zur besseren nutzung der in beheizten raeumen nach oben steigenden waerme
JPS6053018B2 (ja) * 1977-09-07 1985-11-22 住友化学工業株式会社 アゾ−ル系化合物、その製造法および該化合物からなる殺菌剤
DE2743767A1 (de) * 1977-09-29 1979-04-12 Bayer Ag Diastereomere triazolyl-0,n-acetale, verfahren zu ihrer herstellung sowie ihre verwendung als fungizide
US4182862A (en) * 1978-10-18 1980-01-08 Rohm And Haas Company Process for the preparation of 1,3-disubstituted-2-azoyl-2-propen-1-ones
EP0015387B1 (de) * 1979-02-16 1983-01-12 Bayer Ag 1-Vinyltriazol-Derivate, Verfahren zu ihrer Herstellung sowie ihre Verwendung als Wachstumsregulatoren und Fungizide
DE2920437A1 (de) * 1979-05-19 1980-11-27 Bayer Ag Geometrische isomere von 4,4- dimethyl-1-phenyl-2-(1,2,4-triazol-1-yl)- 1-penten-3-olen, verfahren zu ihrer herstellung sowie ihre verwendung als arzneimittel
DE2929602A1 (de) * 1979-07-21 1981-02-12 Bayer Ag Triazolyl-alken-derivate, verfahren zu ihrer herstellung und ihre verwendung als fungizide
DE2944223A1 (de) * 1979-11-02 1981-05-27 Basf Ag, 6700 Ludwigshafen Fungizide entriazole, ihre herstellung und verwendung
DE3000643A1 (de) * 1980-01-10 1981-07-16 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von azolyl-vinyl-ketonen

Also Published As

Publication number Publication date
LV10023B (en) 1995-02-20
NL8001658A (nl) 1980-09-23
DE3010560A1 (de) 1980-10-02
DK157811C (da) 1990-08-13
PL222822A1 (it) 1981-02-13
NL192791B (nl) 1997-10-01
NZ193168A (en) 1983-04-12
YU42969B (en) 1989-02-28
NL192791C (nl) 1998-02-03
LV10023A (lv) 1994-05-10
US4554007A (en) 1985-11-19
DK157811B (da) 1990-02-19
AU536825B2 (en) 1984-05-24
US4749716A (en) 1988-06-07
FR2460939A1 (fr) 1981-01-30
CH644851A5 (de) 1984-08-31
BR8001617A (pt) 1980-11-18
IL59671A0 (en) 1980-06-30
GB2046260A (en) 1980-11-12
AU5657180A (en) 1980-09-25
GB2046260B (en) 1983-12-21
MY8700898A (en) 1987-12-31
HU186281B (en) 1985-07-29
IT1143014B (it) 1986-10-22
CA1154449A (en) 1983-09-27
DE3010560C2 (it) 1990-09-20
DK118580A (da) 1980-09-21
AR226305A1 (es) 1982-06-30
YU76680A (en) 1983-10-31
PL123010B1 (en) 1982-09-30
IL59671A (en) 1984-02-29
FR2460939B1 (fr) 1985-06-28

Similar Documents

Publication Publication Date Title
IT8048189A0 (it) Isomeri geometrici di 1-sostituiti -1-triazolilstireni aventi attivi ta' fungicida diserbante e regolatrice della crescita delle piante eprocedimento per la loro preparazione
RO89367A (ro) Compozitie lichida erbicida,fungicida si de reglare a cresterii plantelor
IT1155366B (it) Emulsioni di bromuro d'argento di ristretta distribuzione delle dimensioni dei grani e procedimento per la loro preparazione
IT1080773B (it) Derivati di acidi piridilossi-fenossi-alcancarbossilici attivi come erbicidi e come regolatori delle piante,procedimento per la loro preparazione e loro impiego
IT1080109B (it) Derivati di triazolo dotati di prorieta' fungicide e regolatrici della crescita delle piante e procedimento per la loro produzione
HUT47390A (en) Fungicidal and plant growth regulating compositions comprising 1-azolyl-2-cyclopropyl-3-phenyl-2-propanol derivatives as active ingredient and process for producing the active ingredients and their intermediates
BR7901271A (pt) Composicao de sulfamatos herbicidas,processos de controle do crescimento de vegetacao indesejavel e de preparacao de sulfamatos
NO862987L (no) Fremgangsmaate for konservering av planter og traer og preparat for anvendelse ved fremgangsmaaten.
IT1132198B (it) Composti eterociclici aventi proprieta' funghicide,erbicide e regolatrici della crescita delle piante
IT1111613B (it) Procedimento e composto per la regolazione della crescita delle piante
HUT47254A (en) Process for producing azole derivatives and their intermediates, as well as fungicides and plant growth regulators comprising azole derivatives as active ingredient
IT8020333A0 (it) Derivati dell'acido 1,2,3-tiadiazol-5-carbossilico, processo per la preparazione di questi composti e mezzi che licontengono con effetto erbicida e regolatore della crescita nonche'funghicida.
HUT47542A (en) Herbicides and plant growth regulators comprising substituted phenoxy-pyridine derivatives as active ingredient and process for producing the active ingredients
IT1092968B (it) Composti triazolici e imidazolici e loro uso come funghicidi e agenti regolatori della crescita delle piante
IT1230115B (it) Procedimento per combattere le malattie fungine delle piante
IT1210996B (it) Composti e composizioni regolanti la crescita delle piante eprocedimento per la loro preparazione.
IT7925164A0 (it) Composizioni regolatrici della crescita delle piante, ed insetticide.
IT1175507B (it) Composti costituiti da 5-ammino-3-osso-4-(sostituito-fenil)-2,3-diidrofurano e suoi derivati, con proprieta' erbicide e di regolazione della crescita delle piante
FI840353A0 (fi) Fungicida triazolfoereningar
ZA818356B (en) Optical isomers of triazolylpentenols,their production and use as fungicides,herbicides and/or plant growth regulants
RO84308A (ro) Compozitie erbicida si de reglare a cresterii plantelor leguminoase
ATE149095T1 (de) Pestizidformulierungen
IT1101706B (it) Sali di acidi alfa-iso-cian-carbossilici, procedimento per la loro preparazione e loro impiego come regolatori della crescita delle piante
IT1222598B (it) Rpocesso per la lotta contro lo sviluppo indesiderato delle piante e cosi' pure per la regolazione deloo sviluppo della crescita delle piante
IT1216820B (it) Procedimento per combattere le malattie fungine delle piante

Legal Events

Date Code Title Description
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19970228