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2004
Pyran derivatives
R 0340
Regioselectivity in Nickel(0) Catalyzed Cycloadditions of Carbon Dioxide with Di— By use of Ni(cod)2/imidazolylidene IMI as catalyst in the title reaction of
50- 093 ynes.
diynes (I), the resulting pyrones are formed with high or complete regioselectivity. In
the major or exclusive regioisomer, the more bulky substituent is placed adjacent to the
carbonyl group. Substitution at the α-position of ethers (V) has no effect on the regioselectivity of the cycloaddition reaction. — (TEKAVEC, T. N.; ARIF, A. M.; LOUIE*,
J.; Tetrahedron 60 (2004) 34, 7431-7437; Dep. Chem., Univ. Utah, Salt Lake City,
UT 84112, USA; Eng.) — Klein
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