Mechanism of fragmentation of alkylidene-Meldrum's acids. Carboxyketene, vinylketene, and methyleneketene intermediates from 5-cyclopentylidene-2,2-dimethyl-1,3-dioxane-4,6-dione
Benzyne, cyclohexyne, and 3-azacyclohexyne have been obtained by flash vacuum pyrolysis of phthalic anhydride, 4-cyclopentylidene-3-methylisoxazol-5(4H)-one (34), and 3-methyl-4-(2-pyrrolidinylidene)isoxazol-5(4H)-one (37), respectively, isolated at 77 K and observed by IR spectroscopy. Trapping and fragmentation reactions are described, and the implications for the mechanism of benzyne formation from
Mechanism of fragmentation of alkylidene-Meldrum's acids. Carboxyketene, vinylketene, and methyleneketene intermediates from 5-cyclopentylidene-2,2-dimethyl-1,3-dioxane-4,6-dione
作者:Curt Wentrup、Gerhard Gross、Hans Michael Berstermann、Primoz Lorencak