Unusual cis and trans architecture of dihydrofunctional double-decker shaped silsesquioxane and synthesis of its ethyl bridged π-conjugated arene derivatives

2017 ◽  
Vol 41 (9) ◽  
pp. 3290-3296 ◽  
Author(s):  
M. Walczak ◽  
R. Januszewski ◽  
M. Majchrzak ◽  
M. Kubicki ◽  
B. Dudziec ◽  
...  
Keyword(s):  
Hydrosilylation Reaction ◽  
Double Decker ◽  
Original Family ◽  
Cis And Trans

An original family of well-defined molecular and macromolecular double-decker silsesquioxane derivatives with ethyl bridged π-conjugated arenes is obtained via hydrosilylation reaction.

Metal supported catalysts obtained by sol-gel in the hydrosilylation of phenylacetylene with R3SiH organosilanes (R3 = Ph3, Ph2Me, and PhMe2)

2000 ◽  
Vol 78 (11) ◽  
pp. 1491-1495 ◽  
Author(s):  
Rafael Jiménez ◽  
Juan Manuel López ◽  
Jorge Cervantes
Keyword(s):  
Specific Activity ◽  
Supported Catalysts ◽  
Sol Gel ◽  
Synthetic Route ◽  
Catalytic Systems ◽  
Hydrosilylation Reaction ◽  
Solid Catalysts ◽  
Sol Gel Process ◽  
Cis And Trans ◽  
Inorganic Matrices

The hydrosilylation reaction of phenylacetylene, generated on the surface of solid catalysts (such as Pt and Ru) supported on inorganic matrices such as MgO obtained by the sol-gel process, yields vinylsilanes as the main products. The products' distribution, specific activity, and turnover reactions were determined for the case of the hydrosilylation reaction of PhC = CH with R3SiH (R = Ph3, Ph2Me, and PhMe2). For Ph3SiH and Ph2MeSiH, the presence of β-trans and α isomers is observed. Addition of PhMe2SiH to phenylacetylene leads to the formation of β (cis and trans) and α isomers. These catalytic systems provide a new synthetic route to Si—C bond formation.Key words: Vinylsilanes, sol-gel catalysts, hydrosilylation and phenylacetylene.

HPLC Characterization of cis and trans Mixtures of Double-Decker Shaped Silsesquioxanes

Silicon ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 5-13 ◽  
Author(s):  
David F. Vogelsang ◽  
Robert E. Maleczka ◽  
Andre Lee
Keyword(s):  
Double Decker ◽  
Cis And Trans

Trypanocidal Structure-Activity Relationshipfor Cis- and Trans-methylpluviatolide

Planta Medica ◽  
2008 ◽  
Vol 74 (03) ◽  
Author(s):  
R Silva ◽  
J Saraiva ◽  
S Albuquerque ◽  
C Curti ◽  
PM Donate ◽  
...  
Keyword(s):  
Structure Activity ◽  
Cis And Trans

The Contribution of Enrique Pichon-Rivière: Comparisons with His European Contemporaries and with Modern Theory

2016 ◽  
Vol 6 (2) ◽  
Author(s):  
David E. Scharff
Keyword(s):  
Social World ◽  
Modern Theory ◽  
George Herbert ◽  
George Herbert Mead ◽  
Analytic Thinking ◽  
Family Analysis ◽  
The Social ◽  
Original Family ◽  
Kurt Lewin ◽  
Social Applications

Enrique Pichon-Rivière, a pioneer of psychoanalysis, worked and wrote in Argentina in the mid-twentieth century, but his work has not so far been translated into English. From the beginning, Pichon-Rivière understood the social applications of analytic thinking, centring his ideas on "el vinculo", which is generally translated as "the link", but could equally be translated as "the bond". The concept that each individual is born into human social links, is shaped by them, and simultaneously contributes to them inextricably ties people's inner worlds to the social world of family and society in which they live. Pichon-Rivière believed, therefore, that family analysis and group and institutional applications of analysis were as important as individual psychoanalysis. Many of the original family and couple therapists from whom our field learned trained with him. Because his work was centred in the analytic writings of Fairbairn and Klein, as well as those of the anthropologist George Herbert Mead and the field theory of Kurt Lewin, his original ideas have important things to teach us today. This article summarises some of his central ideas such as the link, spiral process, the single determinate illness, and the process of therapy.

The intermolecular anthracene-transfer in a regiospecific antipodal C60 difunctionalization

2020 ◽  
Author(s):  
Radu Talmazan ◽  
Klaus R. Liedl ◽  
Bernhard Kräutler ◽  
Maren Podewitz
Keyword(s):  
Noncovalent Interactions ◽  
Interaction Model ◽  
Alder Reaction ◽  
Diels Alder ◽  
Stacking Interactions ◽  
Pi Stacking ◽  
Diels Alder Reaction ◽  
Double Decker ◽  
Anthracene Molecule ◽  
New Strategies

We analyze the mechanism of the topochemically controlled difunctionalization of C60 and anthracene, where an anthracene molecule is transferred from one C60 monoadduct to another one under exclusive formation of equal amounts of C60 and the difficult to make antipodal C60 bisadduct. Our herein disclosed dispersion corrected DFT studies show the anthracene transfer to take place in a synchronous retro Diels-Alder/Diels-Alder reaction: an anthracene molecule dissociates from one fullerene under formation of an intermediate, while already undergoing stabilizing interactions with both neighboring fullerenes, facilitating the reaction kinetically. In the intermediate, a planar anthracene molecule is sandwiched between two neighboring fullerenes and forms equally strong "double-decker" type pi-pi stacking interactions with both of these fullerenes. Analysis with the distorsion interaction model shows that the anthracene unit of the intermediate is almost planar with minimal distorsions. This analysis sheds light on the existence of noncovalent interactions engaging both faces of a planar polyunsaturated ring and two convex fullerene surfaces in an unprecedented 'inverted sandwich' structure. Hence, it sheds light on new strategies to design functional fullerene based materials.<br>

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