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2005
Indan derivatives
Q 1050
Catalytic Cyclization of o-Alkynylbenzaldehyde Acetals and Thioacetals.
Activation of the Platinum Catalyst of Olefins. Scope and Mecha15- 090 Unprecedented
nism of the Reaction. — A general protocol for the transition metal catalyzed
cyclizations of ortho-functionalized phenylacetylenes is given leading to the indenes
(II), (IV) or (VI). In most cases good to acceptable yields are obtained. A variety of
functional groups are tolerated, only electron-donating groups on the phenyl ring such
as in (If) do prevent the cyclization. NMR monitoring and B3LYP/SDD calculations
demonstrate the importance of chelate coordination and the formation of a real carbocationic center. — (NAKAMURA, I.; BAJRACHARYA, G. B.; WU, H.; OISHI, K.;
MIZUSHIMA, Y.; GRIDNEV*, I. D.; YAMAMOTO, Y.; J. Am. Chem. Soc. 126
(2004) 47, 15423-15430; Dep. Chem., Grad. Sch. Sci., Tohoku Univ., Aoba,
Sendai 980, Japan; Eng.) — Kieslich
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