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- W2180300490 abstract "Treatment of p - tert -butylthiacalix[4]arene (H 4 L, 2 ) with TiCl 4 in dichloromethane gave two novel dinuclear titanium(IV) complexes formulated as [Ti 2 LCl 4 ]. One of the complexes was subjected to X-ray crystallographic analysis to show that the calixarene ligand (L 4− ) adopted a cone conformation, forcing the two metal centers to reside in close vicinity with syn arrangement with respect to the mean plane defined by the macrocycle ( 3 ). The other one was assigned to be an anti titanium(IV) complex ( 4 ) based on 1 H NMR spectroscopy. The syn complex showed high catalytic activity in the Mukaiyama–aldol reaction of aromatic aldehydes with silyl enol ethers, indicating the double-activation ability of the bidentate Lewis acid toward the aldehydes. Graphic" @default.
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- W2180300490 date "2002-10-01" @default.
- W2180300490 modified "2023-09-24" @default.
- W2180300490 title "Dinuclear titanium(IV) complex of p-tert-butylthiacalix[4]arene as a novel bidentate Lewis acid catalyst" @default.
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- W2180300490 doi "https://doi.org/10.1016/s0040-4039(02)01833-6" @default.
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