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- W2317423397 abstract "Allyl calcium compounds of different chain lengths [Ca(R)2(THF)x] (x = 0.15−0.25 (1-Ca, 3-Ca), 0.25−0.75 (2-Ca)) were synthesized by salt metathesis of CaI2 with allylpotassium reagents [K(R)] (R = n-butenyl (1-K), isobutenyl (2-K), n-hexenyl (3-K)), prepared from the corresponding α-olefin and Schlosser base. The new calcium derivatives were obtained in nearly quantitative yields. 1-Ca and 2-Ca could be crystallized as triglyme adducts (triglyme: tris(ethylene glycol)dimethyl ether) and structurally characterized by single-crystal X-ray diffraction. All potassium precursors [K(R)] were also isolated and characterized by 1H and 13C NMR spectroscopy. The solution properties in THF are in agreement with an η3-coordination mode of the allyl moiety for all isolated compounds. For the potassium reagents 1-K and 3-K, endo/exo equilibrium distributions of >99:<1 and 85:15 were observed, whereas for the calcium compounds 1-Ca and 3-Ca, distributions of 60:40 and 42:58 were found at 25 °C, respectively. This distribution pattern is discussed in the context of the behavior found for alkali metal analogues." @default.
- W2317423397 created "2016-06-24" @default.
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- W2317423397 date "2011-03-09" @default.
- W2317423397 modified "2023-10-16" @default.
- W2317423397 title "Allyl Calcium Compounds: Synthesis and Structure of Bis(η<sup>3</sup>-1-alkenyl)calcium" @default.
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- W2317423397 doi "https://doi.org/10.1021/om200012k" @default.
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