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- W1981104438 abstract "The anion of (2-oxacyclopentylidene)pentacarbonylchromium(0), (I), is alkylated by addition to ClCH2OCH3 to give (-5methoxymethyl-2-oxacyclopentylidene)pentacarbonylchromium(0), (VI), and (5,5-dimethoxymethyl-2-oxacyclopentylidene)pentacarbonylchromium(0), VII, in 45 and 13% yields, respectively, as well as (5-hydroxymethyl-2-oxacyclopentylidene)pentacarbonylchromium(0), (VIII), and (5-hydroxymethyl-5-methoxymethyl-2-oxacyclopentylidene)pentacarbonylchromium(0), (IX), in a combined yield of 18%. Methanol and water are eliminated from VI and VIII, respectively, to give 64% of (5-exo-methylene-2-oxacyclopentylidene)pentacarbonylchromium(0), (IV), which affords 76% α-methylene-γ-butyrolactone, (X), upon oxidation by ceric ion. Direct addition of one-half equivalent of ClCH2OCH3 to the anion of I gave a 74% yield of the methylene bridged dimer V. Addition of excess ClCH2OCH3 to the bis(triphenylphosphine)iminium salt of the anion of I gave primarily VI (38%)." @default.
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- W1981104438 date "1975-12-01" @default.
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- W1981104438 title "Synthesis of α-methylene-γ-butyrolactone via transition metal carbene complexes" @default.
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- W1981104438 doi "https://doi.org/10.1016/s0022-328x(00)88585-x" @default.
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