Reactions of 2,3-diferrocenylcyclopropenone 1 with ethyl- and benzylmagnesium chlorides afford 3,3-diethyl-and 3,3-dibenzyl-1,2-diferrocenylcyclopropenes 2 and 3, respectively, and products of nucleophilic opening of the three-membered ring resulting from the addition of RMgCl to the carbonyl group, viz., saturated ketones (4,5-diferrocenylheptan-3-ones 4a,b and 3,4-diferrocenyl-1,5-diphenylpentan-2-ones 5a,b as ca. 3 : 1 mixtures of two diastereomers) and other products. The spatial structures of compounds 2 and 4a were established by X-ray diffraction analysis of single crystals. Protonation of the cyclopropenes 2 and 3 with tetrafluoroboric acid at -40 °C yields the corresponding 3,3-dialkyl-1,2-diferrocenylcyclopropylium tetrafluoroborates. Transformation of the latter into diferrocenylallylic cations upon increasing the temperature to 20 °C and their deprotonation under the action of N,N-dimethylaniline were studied. Electrochemical investigation of 1 and 2 shows that in both complexes the cyclopropene spacer allows electronic communication between the two outer ferrocenyl groups, this being notably greater for 2 than for 1.

Klimova, E.I., Berestneva, T.K., Cinquantini, A., Corsini, M., Zanello, P., Toscano, R.A., et al. (2003). 3,3-Diethyl- and 3,3-dibenzyl-1,2-diferrocenylcyclopropenes. ORGANIC & BIOMOLECULAR CHEMISTRY, 1(24), 4458-4464 [10.1039/b307408k].

3,3-Diethyl- and 3,3-dibenzyl-1,2-diferrocenylcyclopropenes

Cinquantini A.;Corsini M.;Zanello P.;
2003-01-01

Abstract

Reactions of 2,3-diferrocenylcyclopropenone 1 with ethyl- and benzylmagnesium chlorides afford 3,3-diethyl-and 3,3-dibenzyl-1,2-diferrocenylcyclopropenes 2 and 3, respectively, and products of nucleophilic opening of the three-membered ring resulting from the addition of RMgCl to the carbonyl group, viz., saturated ketones (4,5-diferrocenylheptan-3-ones 4a,b and 3,4-diferrocenyl-1,5-diphenylpentan-2-ones 5a,b as ca. 3 : 1 mixtures of two diastereomers) and other products. The spatial structures of compounds 2 and 4a were established by X-ray diffraction analysis of single crystals. Protonation of the cyclopropenes 2 and 3 with tetrafluoroboric acid at -40 °C yields the corresponding 3,3-dialkyl-1,2-diferrocenylcyclopropylium tetrafluoroborates. Transformation of the latter into diferrocenylallylic cations upon increasing the temperature to 20 °C and their deprotonation under the action of N,N-dimethylaniline were studied. Electrochemical investigation of 1 and 2 shows that in both complexes the cyclopropene spacer allows electronic communication between the two outer ferrocenyl groups, this being notably greater for 2 than for 1.
Klimova, E.I., Berestneva, T.K., Cinquantini, A., Corsini, M., Zanello, P., Toscano, R.A., et al. (2003). 3,3-Diethyl- and 3,3-dibenzyl-1,2-diferrocenylcyclopropenes. ORGANIC & BIOMOLECULAR CHEMISTRY, 1(24), 4458-4464 [10.1039/b307408k].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1143919
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