144865-56-5Relevant academic research and scientific papers
Stereoselective synthesis of new hetero(P, Si, Ge, Sn)cyclic derivatives from zirconium diyne and diene complexes
Mirza-Aghayan, Maryam,Boukherroub, Rabah,Oba, Gabriel,Manuel, Georges,Koenig, Max
, p. 61 - 70 (2007/10/03)
The dipropargylic derivatives of Si, Ge, P, 1a-c, react with the zirconocene entity 'Cp2Zr' and give the intermediate bicyclocomplexes 2a-c characterized by 1H and 31P-NMR. The electrophilic addition of H+, Br2 leads to the corresponding exo dienic metallacyclopentanes 3,4. The cyclozirconation reaction with hetero-diallylic compounds 5a-d gives the metallacyclopentanes 7-15, after reaction with different electrophiles such as H+, PCl3, PhPCl2, Ph2PCl or Ph2PCl(BH3), Br2. The cyclozirconation reaction of diynes is stereoselective and leads to the E,E-exocyclic dienes whereas the selectivity of cyclozirconation of dienes depends on the substituents on the heteroatom.
Zirconocyclisation: Access to new racemic (di) phosphines
Mirza-Aghayan,Boukherroub,Etemad-Moghadam,Manuel,Koenig
, p. 3109 - 3112 (2007/10/03)
The bis-allylic 1 and the bis-propargylic 6 derivatives react with the zirconocene 'ZrCp2' and lead, after electrophillic addition, to the corresponding chiral trans heterocyclopentanes (M = Si,Ge,P) 3-5 and bis-methylenecyclopentanes 8. New ch
Synthesis of polymetallacycloalkanes
Mazerolles, Pierre,Laurent, Christian
, p. 115 - 125 (2007/10/02)
In the reduction of a mixture of an organosilicon or organogermanium dihalide and 1,4-dibromo-2,3-bis(bromomethyl)-2-butene with an alkali metal forming hexahydrodimetallapentalenes, best yields were obtained by using lithium in ether/tetrahydrofuran.This reaction, when extended to 1,2-dichloro-disilanes and -digermanes gave the corresponding tetrametallaoctahydronaphthalenes.When activated zinc was used instead of alkali metal in these reactions, bis(methylene)metallacycloalkanes were formed; their reactions with germanium diiodide gave bicyclic compounds with two or three metal atoms per molecule.A stepwise reaction gave chains of organogermanium bicyclic compounds of controlled length.
