title: From an Isolable Acyclic Phosphinosilylene Adduct to Donor-Stabilized Si=E Compounds (E=O, S, Se).
abstract: Reaction of the arylchlorosilylene-NHC adduct ArSi(NHC)Cl [Ar=2,6-Trip2C6H3; NHC=(MeC)2(NMe)2C:] 1 with one molar equiv of lithium diphenylphosphanide affords the first stable NHC-stabilized acyclic phosphinosilylene adduct 2 (ArSi(NHC)PPh2), which could be structurally characterized. Compound 2, when reacted with one molar equiv selenium and sulfur, affords the silanechalcogenones 4 a and 4 b (ArSi(NHC)(=E)PPh2, 4 a: E=Se, 4 b: E=S), respectively. Conversion of 2 with an excess of Se and S, through additional insertion of one chalcogen atom into the Si=P bond, leads to 3 a and 3 b (ArSi(NHC)(=E)-E-P(=E)Ph2, 3 a: E=Se, 3 b: E=S), respectively. Additionally, the exposure of 2 to N2O or CO2 yielded the isolable NHC-stabilized silanone 4 c, Ar(NHC)(Ph2P)Si=O.
authors.affiliation: Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: +(49) 3031429732.
authors.forename: Kerstin
authors.initials: K
authors.lastname: Hansen
authors.affiliation: Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, 1111 Budapest (Hungary).
authors.forename: Tibor
authors.initials: T
authors.lastname: Szilvási
authors.affiliation: Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: +(49) 3031429732.|Current address: Faculty of Humanities and Sciences, Maastricht University, Lenculenstraat 14, 6211 KR, Maastricht, P.O. Box 616, 6200 MD Maastricht (The Netherlands).
authors.forename: Burgert
authors.initials: B
authors.lastname: Blom
authors.affiliation: Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: +(49) 3031429732.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Irran
authors.affiliation: Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin (Germany), Fax: +(49) 3031429732. matthias.driess@tu-berlin.de.
authors.forename: Matthias
authors.initials: M
authors.lastname: Driess
keywords: multiple bonds; olefin analogues; phosphorus; silicon; zwitterions