ES272489A1 - Process for the preparation of 4-methyl-5,6-dihydro-(2h)-pyran - Google Patents

Process for the preparation of 4-methyl-5,6-dihydro-(2h)-pyran

Info

Publication number
ES272489A1
ES272489A1 ES0272489A ES272489A ES272489A1 ES 272489 A1 ES272489 A1 ES 272489A1 ES 0272489 A ES0272489 A ES 0272489A ES 272489 A ES272489 A ES 272489A ES 272489 A1 ES272489 A1 ES 272489A1
Authority
ES
Spain
Prior art keywords
pyran
dihydro
methyl
preparation
tetrahydropyran
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
ES0272489A
Other languages
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of ES272489A1 publication Critical patent/ES272489A1/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
    • C07D309/16—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
    • C07D309/18—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member containing only hydrogen and carbon atoms in addition to the ring hetero atom
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
    • C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
    • C07C1/247—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms by splitting of cyclic ethers
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C11/00—Aliphatic unsaturated hydrocarbons
    • C07C11/12—Alkadienes
    • C07C11/173—Alkadienes with five carbon atoms
    • C07C11/18—Isoprene
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/56—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds
    • C07C45/57—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds with oxygen as the only heteroatom
    • C07C45/60—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds with oxygen as the only heteroatom in six-membered rings

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

4-Methyl-5,6-dihydro-(2H)-pyran is prepared by isomerising 4-methylene tetrahydropyran in the presence of a dehydrating catalyst at a temperature between 200 and 400 DEG C. A suitable catalyst is, for example, phosphoric acid deposited on a support. If desired the 4-methylene tetrahydropyran may be diluted with inert gases such as nitrogen, steam or hydrocarbons.
ES0272489A 1960-11-29 1961-11-27 Process for the preparation of 4-methyl-5,6-dihydro-(2h)-pyran Expired ES272489A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR845536A FR1313733A (en) 1960-11-29 1960-11-29 New isoprene manufacturing process from 4-methyl-5, 6-dihydro- (2h) -pyran

Publications (1)

Publication Number Publication Date
ES272489A1 true ES272489A1 (en) 1962-05-16

Family

ID=8743794

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0272489A Expired ES272489A1 (en) 1960-11-29 1961-11-27 Process for the preparation of 4-methyl-5,6-dihydro-(2h)-pyran

Country Status (3)

Country Link
ES (1) ES272489A1 (en)
FR (1) FR1313733A (en)
GB (1) GB964724A (en)

Also Published As

Publication number Publication date
FR1313733A (en) 1963-01-04
GB964724A (en) 1964-07-22

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