1
|
Wiberg N, Preiner G, Schurz K. Zur Frage der intermediären Bildung von Silanonen R
2
SiO bei Reaktionen von Silenen mit Distickstoffoxid. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/cber.19881210808] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nils Wiberg
- Institut für Anorganische Chemie der Universität München, Meiserstraße 1, D‐8000 München 2
| | - Gerhard Preiner
- Institut für Anorganische Chemie der Universität München, Meiserstraße 1, D‐8000 München 2
| | - Klaus Schurz
- Institut für Anorganische Chemie der Universität München, Meiserstraße 1, D‐8000 München 2
| |
Collapse
|
2
|
Gusel'nikov LE. Hetero-π-systems from 2+2 cycloreversions. Part 1. Gusel'nikov–Flowers route to silenes and origination of the chemistry of doubly bonded silicon. Coord Chem Rev 2003. [DOI: 10.1016/s0010-8545(03)00104-8] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
3
|
Wiberg N, Wagner S, Vasisht SK, Polborn K. Adducts of sila-, germa-, and stannaethenes Me2E=C(SiMe3)2 (E = Si, Ge, Sn) with anthracene: syntheses, structures, thermolyses. CAN J CHEM 2000. [DOI: 10.1139/v00-095] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The [4 + 2] cycloadducts of Me2E=C(SiMe3)2 (E = Si, Ge, Sn) and anthracene are prepared by reaction of an excess of anthracene in benzene with the [2 + 2] cycloadduct of Me2Si=C(SiMe3)2 and Ph2C=NSiMe3 at 130°C, with Me2Ge(OPh)-CLi(SiMe3)2 at 100°C, and with Me2SnBr-CNa(SiMe3)2 at 80°C, respectively. The mentioned adducts act as sources for the ethenes Me2E=C(SiMe3)2 above 100°C, the intermediate formation of which has been demonstrated by trapping experiments with 2,3-dimethylbutadiene (formation of a [4 + 2] and an ene reaction product). The half life time of the anthracene adducts with E = Si, Ge, and Sn in the presence of DMB (= 2,3-dimethylbutadiene) in benzene on thermolysis at 130°C (first order reactions) is found to be 141, 12, and 0.3 h, respectively. In the absence of DMB, thermolysis of the cycloadducts leads in benzene as reaction medium exclusively to the dimers of the Me2E=C(SiMe3)2 intermediates. In toluene as reaction medium ene products of Me2E=C(SiMe3)2 are observed in addition to the dimers. The ene products are not isolable as such, but only after migration of the Me2E-CH(SiMe3)2 substituents. The formed derivatives C6H5CH2EMe2CH(SiMe3)2 of toluene in part give a second ene reaction with another Me2E=C(SiMe3)2 molecule. X-ray structure analyses of the mentioned sources in fact prove the latter to be normal [4 + 2] cycloadducts of Me2E=C(SiMe3)2 and anthracene.Key words: silaethene, germaethene, stannaethene, [4 + 2] anthracene adducts, [4 + 2] cycloadditions and reversions, ene reactions, X-ray structure analyses.
Collapse
|
4
|
|
5
|
Wiberg N, Hwang-Park HS, Lerner HW, Dick S. Über das SilaethentBu2SiC(SiMe3)2 und die Struktur sowie Reaktivität seines [4 + 2]-Cycloaddukts mit Ph2CO. ACTA ACUST UNITED AC 1996. [DOI: 10.1002/cber.19961290417] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
6
|
|
7
|
|
8
|
Auner N, Weingartner AW, Bertrand G. Silaheterocyclen, XXIII. Synthese und Thermolyseverhalten von Si-funktionellen 2-Silaazetidinen. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/cber.19931260306] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
9
|
Wiberg N, Wagner S, Fischer G. Zur Reaktivität des Silaethens Me2Si = C(SiMe3)2: Relative Geschwindigkeiten der Diels-Alder-Reaktionen mit organischen Dienen1,2). ACTA ACUST UNITED AC 1991. [DOI: 10.1002/cber.19911240916] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
10
|
Auner N, Ziche W, West R. The wonderful world of organosilicon chemistry. HETEROATOM CHEMISTRY 1991. [DOI: 10.1002/hc.520020216] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
11
|
Wiberg N, Fischer G, Wagner S. Zur Reaktivität des Silaethens Me2SiC(SiMe3)2: Stereospezifität der Diels-Alder-Reaktionen mit Hexadienen1,2. ACTA ACUST UNITED AC 1991. [DOI: 10.1002/cber.19911240416] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
12
|
Wiberg N, Link M, Fischer G. Erzeugung und Nachweis des Silaethens Ph2SiC(SiMe3)2. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/cber.19891220303] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|