69974-15-8Relevant academic research and scientific papers
Five-Membered 2,3-Dioxo Heterocycles: XLV. Thermolysis of 5-Aryl-4-phenyl-2,3-dihydrofuran-2,3-diones in the Absence of Other Partners and in the Presence of Carbonyl Compounds
Vostrov,Leont'eva,Tarasova,Maslivets
, p. 103 - 107 (2007/10/03)
Aroyl(phenyl)ketenes generated by thermolysis of 5-aryl-4-phenyl-2,3- dihydrofuran-2,3-diones undergo [4+2]-cyclodimerization to 3-aroyl-6-aryl-3,5- diphenyl-3,4-dihydro-2H-pyran-2,4-diones. Heating of the latter leads to rearrangement with formation of 4-aroyloxy-6-aryl-3,5-diphenyl-2H-pyran-2-ones. Thermolysis of 5-aryl-4-phenyl-2,3-dihydrofuran-2,3-diones in the presence of carbonyl compounds yields 6-aryl-5-phenyl-4H-1,3-dioxin-4-ones.
CATALYTIC AND THERMAL DECOMPOSITION OF 2-DIAZO-1,3-DIPHENYL-1,3-PROPANEDIONE IN DIMETHYL HYDROGEN PHOSPHITE AND O,O-DIETHYL HYDROGEN PHOSPHOROTHIOITE
Arbuzov, B. A.,Polozov, A. M.,Polezhaeva, N. A.
, p. 1351 - 1354 (2007/10/02)
By the CuII-catalyzed decomposition of 2-diazo-1,3-diphenyl-1,3-propanedione in dimethyl hydrogen phosphite dimethyl (dibenzoylmethyl)phosphonate is obtained.By means of IR and PMR spectroscopy it was shown that in the crystalline state the phsphonate exists in the diketo form, but in CDCl3 solution it is an equilibrium mixture of keto and ionized forms.
