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- W2015256211 abstract "A number of substituted-titanocene−alkynyl−alkenyl complexes, [(η5-C5Me4R1)2Ti(η1-C⋮CR2)(η1-(E)-CHCHR2)] (R1 = H, Me, Ph, Bz; R2 = CMe3, SiMe3, ferrocenyl; A type complexes), were obtained by reacting the corresponding bis(trimethylsilyl)ethyne complexes [(η5-C5Me4R1)2Ti(η2-Me3SiC⋮CSiMe3)] with 1-alkynes R2C⋮CH in the dark at 60 °C. The complexes undergo a coupling of the carbyl ligands upon exposure to sunlight to give titanocene complexes with 1,4-disubstituted but-1-en-3-ynes, [(η5-C5Me4R1)2Ti(3,4-η-R2C⋮CCHCHR2)] (B type complexes). In contrast to A type complexes that do not react further with an excess of tert-butylethyne and (trimethylsilyl)ethyne in the dark, B type complexes induce rapid dimerization of these terminal alkynes to 2,4-disubstituted but-1-en-3-ynes (head-to-tail dimers). This implies that the known dimerization of 1-alkynes in the presence of [(η5-C5Me4R1)2Ti(η2-Me3SiC⋮CSiMe3)] (R1 = H, Me) performed in diffuse daylight is initiated by the B type complexes originating from photoinduced conversion of the initially formed A type products. Titanocene complexes with 2,4-disubstituted but-1-en-3-ynes, [(η5-C5Me4R1)2Ti(3,4-η-R2C⋮CC(R2)CH2)] (R1 = H, Me, Ph; R2 = SiMe3), were also prepared and their participation in the catalytic cycle was demonstrated." @default.
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- W2015256211 date "1999-10-16" @default.
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- W2015256211 title "Photoinduced Generation of Catalytic Complexes from Substituted-Titanocene−Bis(trimethylsilyl)ethyne Complexes: Contribution to the Mechanism of the Catalytic Head-to-Tail Dimerization of Terminal Alkynes" @default.
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- W2015256211 doi "https://doi.org/10.1021/om9905714" @default.
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