Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1985-02-01
1987-04-21
Hollrah, Glennon H.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C07D30732
Patent
active
046598430
ABSTRACT:
The invention relates to a process for preparing 3-methyl-2-butene-4-olide by the codimerization of methylenecyclopropane with carbon dioxide (CO.sub.2) in the presence of organic complex compounds of transistion metals, which process is characterized in that the codimerization is carried out at a temperature of 100.degree. C. to 200.degree. C. in the presence of palladium(O) compounds which are stable in the reaction mixture up to 200.degree. C. and with CO.sub.2 under a pressure of 10 to 110 bar, optionally in the presence of a solvent.
REFERENCES:
Inoue et al., Journal Chem. Society Chem. Comm., 1979, pp. 982, Reacting of Methylenecyclopropanes with CO.sub.2 Catalyzed by Pd(O) Complexes.
Sasaki et al, J.C.S. Chem. Comm., 1976, pp. 605-606, Rx of CO.sub.2 with Butadiene Catalyzed by Pd Complexes.
Binger et al, Angew. Chem. Int. Ed. Engl., 16(1977), vol. 4, Pd(O) Catalyzed Cyclo Additions of Methylenecyclopropane to Alkenes.
Lee-Ruff; Can. J. Chem., vol. 50, No. 6, 3/72, pp. 952-955, Acid Catalyzed Rx of Cyclobutanones II.
Binger Paul
Weintz Hans-Joachim
Dinner Dara
Hollrah Glennon H.
Studiengesellschaft Kohle MBH
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