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2005
Carbonylation
O 0305
A Cyclobutadiene Equivalent in the Catalytic Pauson—Khand Reaction. — Tricompound (I) is successfully applied as a stable cyclobutadiene equivalent in the
06- 061 cyclic
Pauson—Khand reaction with terminal alkynes (II). A thermal retro-Diels—Alder
reaction is subsequently induced to furnish bicycloheptadienones (V), the formal Pauson—Khand products of alkynes with cyclobutadiene, in good yields. This reaction
sequence can be carried out without isolation of the Pauson—Khand products (IV).
Internal alkynes do not or only sluggishly react with compound (I). — (GIBSON*, S.
E.; MAINOLFI, N.; KALINDJIAN, S. B.; WRIGHT, P. T.; Angew. Chem., Int. Ed. 43
(2004) 42, 5680-5682; Dep. Chem., Imp. Coll. Sci. Technol. Med., London SW7 2AY,
UK; Eng.) — Mischke
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