RO72847B - PROCESS FOR PREPARATION OF SUBSTITUTED CHROMONES - Google Patents

PROCESS FOR PREPARATION OF SUBSTITUTED CHROMONES

Info

Publication number
RO72847B
RO72847B RO81993A RO8199375A RO72847B RO 72847 B RO72847 B RO 72847B RO 81993 A RO81993 A RO 81993A RO 8199375 A RO8199375 A RO 8199375A RO 72847 B RO72847 B RO 72847B
Authority
RO
Romania
Prior art keywords
preparation
reactants
general formula
taken
temperature
Prior art date
Application number
RO81993A
Other languages
Romanian (ro)
Other versions
RO72847A (en
Original Assignee
S.F.Spa
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 S.F.Spa filed Critical S.F.Spa
Publication of RO72847B publication Critical patent/RO72847B/en
Publication of RO72847A publication Critical patent/RO72847A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
    • C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
    • C07D311/22—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4
    • C07D311/24—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Pyrane Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Plural Heterocyclic Compounds (AREA)

Abstract

Inventia se refera la un procedeu de preparare a cromonelor substituite cu formula generala I: (vezi formula) în care R reprezinta hidrogen sau metil, care consta în aceea ca se aduce în reactie un compus cu formula generala II: (vezi formula) în care R are semnificatiile aratate mai sus, cu sodiu metalic, reactantii fiind luati în raport în greutate de circa 12:1, în prezenta de etanol, la temperatura de 20...40 degree C în mediu de toluen, apoi produsul de reactie dupa separare si purificare este supus oxidarii cu anhidrida cromica, reactantii fiind luati în raport de circa 0,9:1, la temperatura de 50...60 degree C, în mediu de acid acetic apos, apoi amestecul de reactie este prelucrat în vederea separarii produsului de reactie, în mod cunoscut.The invention relates to a process for the preparation of substituted chromones of the general formula I wherein R represents hydrogen or methyl which comprises reacting a compound of the general formula II: R is as defined above with sodium metal, the reactants being taken in a weight ratio of about 12: 1 in the presence of ethanol at a temperature of 20-40 ° C in toluene, then the reaction product after separation and the purification is subjected to oxidation with the chromic anhydride, the reactants being taken in a ratio of about 0.9: 1 at a temperature of 50-60 ° C in an aqueous acetic acid medium, then the reaction mixture is processed to separate the product reaction, in a known manner.

RO7581993A 1974-04-17 1975-04-15 PROCESS FOR PREPARATION OF SUBSTITUTED CHROMONES RO72847A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT21515/74A IT1044793B (en) 1974-04-17 1974-04-17 PREPARATION OF PIRANIC PASTIAL STRUCTURE COMPOUNDS

Publications (2)

Publication Number Publication Date
RO72847B true RO72847B (en) 1983-06-30
RO72847A RO72847A (en) 1983-07-07

Family

ID=11182945

Family Applications (1)

Application Number Title Priority Date Filing Date
RO7581993A RO72847A (en) 1974-04-17 1975-04-15 PROCESS FOR PREPARATION OF SUBSTITUTED CHROMONES

Country Status (17)

Country Link
JP (1) JPS50137981A (en)
BG (1) BG24672A3 (en)
DD (1) DD121935A5 (en)
DE (1) DE2516623A1 (en)
DK (1) DK165975A (en)
ES (1) ES436627A1 (en)
FI (1) FI751145A7 (en)
FR (1) FR2303010A1 (en)
IL (1) IL47083A0 (en)
IN (1) IN142206B (en)
IT (1) IT1044793B (en)
LU (1) LU72297A1 (en)
NL (1) NL7504598A (en)
NO (1) NO751362L (en)
RO (1) RO72847A (en)
SE (1) SE7504342L (en)
ZA (1) ZA752432B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3722886A1 (en) * 1987-07-10 1989-01-19 Basf Ag METHOD FOR THE PRODUCTION OF (ALPHA), SS-SUBSTITUTED ACROLEINS AND NEW SUBSTITUTED ACROLEINS
KR960008645B1 (en) * 1993-09-08 1996-06-28 동국제약 주식회사 Preparation of ortho-isopropylized phenol derivatives
WO2021250164A1 (en) * 2020-06-12 2021-12-16 Firmenich Sa Enol ether properfume

Also Published As

Publication number Publication date
DK165975A (en) 1975-10-18
IL47083A0 (en) 1975-06-25
JPS50137981A (en) 1975-11-01
ES436627A1 (en) 1977-05-01
IN142206B (en) 1977-06-11
NO751362L (en) 1975-10-20
SE7504342L (en) 1975-10-20
ZA752432B (en) 1976-09-29
IT1044793B (en) 1980-04-21
BG24672A3 (en) 1978-04-12
LU72297A1 (en) 1975-08-20
DE2516623A1 (en) 1975-10-23
NL7504598A (en) 1975-10-21
FI751145A7 (en) 1975-10-18
RO72847A (en) 1983-07-07
DD121935A5 (en) 1976-09-05
FR2303010A1 (en) 1976-10-01

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