- Synthesis and transformations of metallacycles 37. Cp2ZrCl 2-Catalyzed cycloalumination of substituted methylidenecyclopropane with Et3Al
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Cycloalumination of substituted methylidenecyclopropanes with Et 3Al catalyzed by Cp2ZrCl2 affords alumaspiro[2.4]heptanes in 64-92% yields.
- D'Yakonov,Trapeznikova,Dzhemilev
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experimental part
p. 107 - 111
(2011/08/07)
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- One-pot synthesis of small spirocarbocycles through the catalytic cyclometalation reactions of unsaturated compounds
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The mild and efficient one-pot methods to synthesize substituted spirocyclopropanes and spirocyclobutanes are reported. The elaborated procedures based on consecutive cycloalumination of methylenecyclopropanes, methylenecyclobutanes or cycloalkynes assist
- D'yakonov, Vladimir A.,Tuktarova, Regina A.,Trapeznikova, Olga A.,Khalilov, Leonard M.,Popod'ko, Natal'ya R.
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experimental part
p. 20 - 33
(2011/06/21)
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- Synthesis, Structure, and Reactions of Stable Titanacyclopentanes
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Titanacyclic compounds of the formula Cp*2Ti(CH2CH2C(CH2CHR)CH2) (5a; R=H and 5b; R=C6H5, Cp*=pentamethylcyclopentadienyl), the first stable titanacyclopentanes, have been prepared by the reaction of bis(pentamethylcyclopentadienyl)titanium-ethylene complex (3) with methylenecyclopropanes (4), and their structures were determined based on both spectroscopic data and X-ray crystallography.Complex 5b crystallized in space group P21/a (Z=4) with cell constants, a=21.832(3), b=8.580(1), c=14.759(2) Angstroem, β=96.81(1) deg, U=2744.9(6) Angstroem3 (4261 reflections, R=0.053).The reaction of 5 with carbon monoxide afforded spiroheptan-5-ones in 98percent yield.The thermal decomposition of 5 has been investigated, and possible mechanisms of the reactions have been proposed based on deuterium-labeled experiments.A novel formal reductive elimination of organic ligands giving 1-phenylspirohexane has been observed in the thermolysis of 5b.A structure-reactivity relationship has been discussed.
- Mashima, Kazushi,Sakai, Nozomu,Takaya, Hidemasa
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p. 2475 - 2483
(2007/10/02)
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