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2005
Cycloaddition reactions
O 0070
Diastereoselective Intramolecular Temporary Silicon-Tethered Rhodium[4 + 2 + 2] Cycloisomerization Reactions: Regiospecific Incorporation
01- 042 -Catalyzed
of Substituted 1,3-Butadienes. — An intramolecular version of the recently published title cycloisomerization reaction is developed using the temporary silicon tether
strategy. This method allows for utilization of substituted dienes which show low reactivity or selectivity in the intermolecular reaction. It is mentioned that the sulfone tether
in the 1,6-enyne unit cannot be used in this intramolecular variant. — (EVANS*, P.
A.; BAUM, E. W.; J. Am. Chem. Soc. 126 (2004) 36, 11150-11151; Dep. Chem.,
Indiana Univ., Bloomington, IN 47405, USA; Eng.) — Nuesgen
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