Journal of Organometallic Chemistry p. 1 - 8 (1982)
Update date:2022-08-17
Topics:
Holtkamp, H. C.
Schat, G.
Blomberg, C.
Bickelhaupt, F.
1,4-Bis(bromomagnesio)butane (VI) and magnesacyclopentane (IV) were prepared and investigated as such and in combination with MgBr2 by measuring the degree of association in THF solution at three temperatures.It was established that IV does not exist as such, but is completely dimerized to 1,6-dimagnesacyclodecane (V).A Schlenk equilibrium is established between V and VI with K4(28.17 deg) = 100 +/- 50, K4(39.75 deg) = 250 +/- 100 and K4(48.84 deg) = 500 +/- 200 and the thermodynamic parameters ΔH4 = 15 kcal mol-1 and ΔS4 = 59 e.u..These values are veryclose to those of the higher homologue, 1,5-bis(bromomagnesio)pentane (III) and of ethylmagnesium bromide.It is concluded that these di-Grignard reagents behave essentially like the normal monovalent Grignard reagents.
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