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1342318484
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note
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We also tested these reactions using three equivalents of DMSO. In the case of the aromatic substrate, the desired products were hardly obtained; Z-crotylation 9% (synlanti = 3/97), E-crotylation 3% (synlanti = not determined). As for the α,β-unsaturated substrate, even allylation did not proceed using DMSO.
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0035966240
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Triphenylphosphine polystyrene (Novabiochem®, polymer matrix: copoly(styrene-1% DVB), 100-200 mesh) was oxidized according to the reported procedure: T. Shimada, H. Kurushima, Y.-H. Cho and T. Hayashi, J. Org. Chem., 2001, 66, 8854.
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J. Org. Chem.
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Shimada, T.1
Kurushima, H.2
Cho, Y.-H.3
Hayashi, T.4
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1342318485
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note
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The elemental analysis showed that PS-phosphine oxide 2 contained 4.2% phosphorous atoms.
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PS-phosphine oxide 2 is not soluble but swollen in dichloromethane. After the reaction, 2 was recovered quantitatively by simple filtration and washing (water, methanol, diethyl ether, tetrahydrofuran, and dichloromethane). It might be possible that one or two phosphine oxide components in 2 activate allyltrichlorosilane in the transition state, though the latter might be less prominent in the polymer matrix.
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