Different radical initiation techniques of hydrosilylation reactions of multiple bonds in water: thermal and photochemical initiation

2010 ◽  
Vol 23 (10) ◽  
pp. 944-949 ◽  
Author(s):  
Julia Calandra ◽  
Al Postigo ◽  
Diana Russo ◽  
Norma Sbarbati Nudelman ◽  
Juan José Tereñas
Keyword(s):  
Multiple Bonds ◽  
Radical Initiation ◽  
Photochemical Initiation

Hydrosilylation of C−C Multiple Bonds Using (Me3Si)3SiH in Water. Comparative Study of the Radical Initiation Step

2009 ◽  
Vol 28 (11) ◽  
pp. 3282-3287 ◽  
Author(s):  
Al Postigo ◽  
Sergey Kopsov ◽  
Simon S. Zlotsky ◽  
Carla Ferreri ◽  
Chryssostomos Chatgilialoglu
Keyword(s):  
Comparative Study ◽  
Multiple Bonds ◽  
Radical Initiation ◽  
Initiation Step

The Use of Styrenes as Embedding Media for Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 488-489
Author(s):  
Edward D. De-Lamater ◽  
Eric Johnson ◽  
Thad Schoen ◽  
Cecil Whitaker
Keyword(s):  
Electron Microscopy ◽  
Surface Tension ◽  
Ultraviolet Light ◽  
Methyl Ethyl Ketone Peroxide ◽  
Methyl Ethyl ◽  
Styrene Polymerization ◽  
Radical Initiation ◽  
Tertiary Butyl ◽  
Low Viscosity ◽  
Free Radical Initiation

Monomeric styrenes are demonstrated as excellent embedding media for electron microscopy. Monomeric styrene has extremely low viscosity and low surface tension (less than 1) affording extremely rapid penetration into the specimen. Spurr's Medium based on ERL-4206 (J.Ultra. Research 26, 31-43, 1969) is viscous, requiring gradual infiltration with increasing concentrations. Styrenes are soluble in alcohol and acetone thus fitting well into the usual dehydration procedures. Infiltration with styrene may be done directly following complete dehydration without dilution.Monomeric styrenes are usually inhibited from polymerization by a catechol, in this case, tertiary butyl catechol. Styrene polymerization is activated by Methyl Ethyl Ketone peroxide, a liquid, and probably acts by overcoming the inhibition of the catechol, acting as a source of free radical initiation.Polymerization is carried out either by a temperature of 60°C. or under ultraviolet light with wave lengths of 3400-4000 Engstroms; polymerization stops on removal from the ultraviolet light or heat and is therefore controlled by the length of exposure.

To Bend or Not to Bend, the Dilemma of Multiple Bonds

2019 ◽  
Author(s):  
Michele Pizzocchero ◽  
Matteo Bonfanti ◽  
Rocco Martinazzo
Keyword(s):  
First Principles ◽  
2D Materials ◽  
Main Group ◽  
First Principles Calculations ◽  
Group 14 ◽  
Multiple Bonds ◽  
Main Group Elements ◽  
Structural Distortions

The manuscript addresses the issue of the structural distortions occurring at multiple bonds between high main group elements, focusing on group 14. These distortions are known as trans-bending in silenes, disilenes and higher group analogues, and buckling in 2D materials likes silicene and germanene. A simple but correlated \sigma + \pi model is developed and validated with first-principles calculations, and used to explain the different behaviour of second- and higher- row elements.

Relative Reactivities of 1,1,1-Trichloroethane and 1,1,1-Trichlorotrifluoroethane in Competitive Addition Reactions

1992 ◽  
Vol 57 (6) ◽  
pp. 1291-1298 ◽  
Author(s):  
František Adámek ◽  
Milan Hájek ◽  
Zbyněk Janoušek
Keyword(s):  
Free Radical ◽  
Reaction Mechanism ◽  
Relative Reactivity ◽  
Addition Reactions ◽  
Radical Initiation ◽  
Amine Complexes ◽  
Free Radical Initiation ◽  
Ru Complexes ◽  
Radical Initiators

Relative reactivity of CH3CCl3 and CF3CCl3 measured in competitive addition reactions with 1-hexene in the presence of free radical initiators or Cu, Pd and Ru complexes was found to depend on the type of catalyst. The unusual course of the reaction has been found in the additions catalyzed with copper(I)-amine complexes where CH3CCl3 in competition with CF3CCl3 was completely unreactive. The results have been explained in terms of the change of reaction mechanism and compared with classical free radical initiation.

Silver-Catalyzed Hydroboration of C–X (X = C, O, N) Multiple Bonds

2021 ◽  
Vol 23 (5) ◽  
pp. 1681-1686
Author(s):  
Vipin K. Pandey ◽  
Chandra Shekhar Tiwari ◽  
Arnab Rit
Keyword(s):  
Multiple Bonds

ChemInform Abstract: Multiple Bonds Between Main Group Elements and Transition Metals. Part 84. Organoosmium Oxides: Efficient Syntheses and Structures.

ChemInform ◽  
2010 ◽  
Vol 22 (10) ◽  
pp. no-no
Author(s):  
W. A. HERRMANN ◽  
S. J. EDER ◽  
P. KIPROF ◽  
K. RYPDAL ◽  
P. WATZLOWIK
Keyword(s):  
Transition Metals ◽  
Main Group ◽  
Multiple Bonds ◽  
Main Group Elements
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