Evidence of carbon–carbon bond formation on GaAs(100)via Fischer–Tropsch methylene insertion reaction mechanism

2005 ◽  
pp. 4348 ◽  
Author(s):  
Neil T. Kemp ◽  
Nagindar K. Singh
2000 ◽  
Vol 72 (9) ◽  
pp. 1715-1719 ◽  
Author(s):  
O. G. Kulinkovich

Dialkoxytitanacyclopropane intermediates [or titanium (II)-olefin complexes] generated in situ from ethylmagnesium bromide and titanium (IV) isopropoxide react with allylic alcohols and allylic ethers to afford SN2' allylic ethylation products. The reaction proceeds with high regioselectivity and with low to high trans-/cis-stereoselectivity. This observation and others suggest a reaction mechanism involving an EtMgBr-initiated formation of titanacyclopentane ate complex 10 from titanacyclopropane-olefin complex 7 as a key step. Based on this assumption, a modified mechanism of titanium-mediated cyclopropanation of esters with Grignard reagents is proposed.


2020 ◽  
Vol 602 ◽  
pp. 117607
Author(s):  
Buchang Shi ◽  
Yunxin Liao ◽  
Zachary J. Callihan ◽  
Brad T. Shoopman ◽  
Mingsheng Luo

The Fischer-Tropsch synthesis of hydrocarbons probably involves an array of carbon-carbon bond-formation processes occurring to unite carbene, carbyne, alkyl, olefin, and related species on a metal surface. In seeking to understand the nature of such processes, model diruthenium complexes have been prepared and the products of their thermolysis and reactions with unsaturated hydrocarbons investigated. The combination at a diruthenium centre of two carbenes, of a carbene and an alkyne, and of a carbyne and an olefin is described, and the possible implications for metal surface processes are emphasized.


2020 ◽  
Vol 11 (1) ◽  
Author(s):  
C. J. (Kees-Jan) Weststrate ◽  
Devyani Sharma ◽  
Daniel Garcia Rodriguez ◽  
Michael A. Gleeson ◽  
Hans O. A. Fredriksson ◽  
...  

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