213463-07-1Relevant 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 (1998)
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.
