Functionalized Cyclic Disilenes via Ring Expansion of Cyclotrisilenes with Isocyanides
作者:Yu Ohmori、Masaaki Ichinohe、Akira Sekiguchi、Michael J. Cowley、Volker Huch、David Scheschkewitz
DOI:10.1021/om400054u
日期:2013.3.25
four-membered trisilacyclobutenes 2 with an exocyclic imine functionality as the major products of formal insertion into one of the Si–Si single bonds of 1. Minor quantities of the iminotrisilabicyclo[1.1.0]butanes 3 are obtained as side products, formally resulting from [1 + 2] cycloaddition of the isocyanides to the Si–Si double bond of 1. The bicyclo[1.1.0]butanes 3 become dominant at lower temperatures
作者:Michael J. Cowley、Yu Ohmori、Volker Huch、Masaaki Ichinohe、Akira Sekiguchi、David Scheschkewitz
DOI:10.1002/anie.201307450
日期:2013.12.9
Spontaneous reaction of carbon monoxide with cyclotrisilenes has been observed. Depending on the substitution pattern, the initial product of carbonylation either dimerizes or can be trapped to yield highly functionalized cyclic silenes.
From a Si<sub>3</sub>-Cyclopropene to a Si<sub>3</sub>S-Bicyclo[1.1.0]butane to a Si<sub>3</sub>S-Cyclopropene to a Si<sub>3</sub>S<sub>2</sub>-Bicyclo[1.1.0]butane: Back-and-Forth, and In-Between
作者:Vladimir Ya. Lee、Olga A. Gapurenko、Shogo Miyazaki、Akira Sekiguchi、Ruslan M. Minyaev、Vladimir I. Minkin、Heinz Gornitzka
DOI:10.1002/anie.201506625
日期:2015.11.16
Compact and highly reactive bicyclo[1.1.0]butanes constitute one of the most fascinating classes of organic compounds. Furthermore, interplay of bicyclo[1.1.0]butanes with their valence isomers, such as buta‐1,3‐dienes and cyclobutenes, is among the fundamental pericyclic transformations in organic chemistry. Herein we report the back‐and‐forth interconversion between the cyclotrisilenes and thiatrisilabicyclo[1
Cyclotrisilene,
(tBu2MeSi)4Si3, was reacted
with phenylacetylene to produce an unusual
1,2,5-trisilabicyclo[3.2.0]hepta-3,6-diene derivative, whose structure was
determined by NMR spectroscopy and X-ray crystallography; a mechanism for
its formation is proposed.
Heavy cyclopropene analogues R4SiGe2 and R4Ge3 (R = SiMe Bu2) – New members of the cyclic digermenes family
作者:Vladimir Ya. Lee、Hiroyuki Yasuda、Masaaki Ichinohe、Akira Sekiguchi
DOI:10.1016/j.jorganchem.2006.03.049
日期:2007.1
1H-Siladigermirene R4SiGe2 (2a) and 1H-trigermirene R4Ge3 (2b) (R = SiMe'Bu,) with a Ge=Ge double bond were synthesized by the reaction of tetrachlorodigermane RGeCl2-GeCl2R with dilithiosilane R2SiLi2 and dilithiogermane R2GeLi2, respectively. The skeletal Ge=Ge double bond of 2a is trans-bent (51.0(2)degrees) with a bond distance of 2.2429(6) angstrom. The reaction of both 2a and 2b with CH2Cl2 resulted in the formation of unusual four-membered ring compounds 5a and 5b as a result of a ring expansion reaction. 1H-Trisilirene 7a and 3H-disilagermirene 7b with an Si=Si double bond also smoothly reacted with CH2Cl2 to yield the four-membered ring systems 8a and 8b, respectively. (c) 2006 Elsevier B.V. All rights reserved.