Ionic Transfer Reactions with Cyclohexadiene-Based Surrogates

Synlett ◽  
2019 ◽  
Vol 30 (20) ◽  
pp. 2216-2232 ◽  
Author(s):  
Johannes C. L. Walker ◽  
Martin Oestreich
Keyword(s):  
Research Program ◽  
Transfer Reactions ◽  
Ion Chemistry ◽  
Metal Free ◽  
Ionic Transfer ◽  
Mineral Acids ◽  
A Current ◽  
The Way

A current research program in our laboratory is devoted to the development of cyclohexa-1,4-diene-based surrogates of difficult-to-handle compounds and their application in metal-free ionic transfer reactions. These investigations grew from our interest in silylium ion chemistry and consequently concentrated initially on surrogates of gaseous and explosive hydrosilanes such as Me3SiH and even monosilane (SiH4). Since then, we have expanded the concept to design surrogates of other species including H2, mineral acids (HI and HBr), and hydrocarbons (isobutane and isobutene). This Account summarizes our discoveries in this area to date, describing the challenges we faced along the way and how we combatted them.1 Introduction2 Transfer Hydrofunctionalization: Variation of the Electrofuge3 Transfer Hydrofunctionalization: Variation of the Nucleofuge4 Transfer Hydrohalogenation Using a Modified Surrogate5 Surrogate Synthesis6 Conclusion

What role do the emotions play in cognition?

2003 ◽  
Vol 4 (1) ◽  
pp. 81-100 ◽  
Author(s):  
Jason L. Megill
Keyword(s):  
Face Recognition ◽  
Selective Attention ◽  
Research Program ◽  
Affective Computing ◽  
Higher Order ◽  
Brain Disorders ◽  
Frame Problem ◽  
Cognitive Theories ◽  
The Frame Problem ◽  
The Way

This paper has two aims: (1) to point the way towards a novel alternative to cognitive theories of emotion, and (2) to delineate a number of different functions that the emotions play in cognition, functions that become visible from outside the framework of cognitive theories. First, I hold that the Higher Order Representational (HOR) theories of consciousness — as generally formulated — are inadequate insofar as they fail to account for selective attention. After posing this dilemma, I resolve it in such a manner that the following thesis arises: the emotions play a key role in shaping selective attention. This thesis is in accord with A. Damasio’s (1994) noteworthy neuroscientific work on emotion. I then begin to formulate an alternative to cognitive theories of emotion, and I show how this new account has implications for the following issues: face recognition, two brain disorders (Capgras’ and Fregoli syndrome), the frame problem in A.I., and the research program of affective computing.

Temporary Intramolecular Generation of Pyridine Carbenes in Metal‐Free Three‐Component CH Bond Functionalisation/Aryl‐Transfer Reactions

2013 ◽  
Vol 19 (51) ◽  
pp. 17578-17583 ◽  
Author(s):  
Faisal Nawaz ◽  
Kishor Mohanan ◽  
Laurence Charles ◽  
Michel Rajzmann ◽  
Damien Bonne ◽  
...  
Keyword(s):  
Transfer Reactions ◽  
Metal Free ◽  
Component C ◽  
Aryl Transfer

Compremos como galegos

2017 ◽  
Vol 14 (1) ◽  
pp. 28-52
Author(s):  
Ana Maria Anderson
Keyword(s):  
Imaginary World ◽  
Language And Culture ◽  
Rhetorical Devices ◽  
Regional Language ◽  
Current Concern ◽  
A Current ◽  
The Way

Abstract This work investigates a place of intersection between advertising and politics in Galicia, namely the series of television spots created by the supermarket chain GADIS under the title Vivamos como galegos. Most studies of this series have focused exclusively on the first spot and have argued that the success of the ad is due primarily to the way it makes Galician identity attractive. While agreeing that this factor is important, the present analysis expands on previous studies by analyzing rhetorical devices in and intertextual relationships between five ads in the series to argue that these spots discursively create an imaginary world in which Galician language and culture are timeless and will not be lost. This ideal characteristic responds to a current concern of Galician society, namely, the decreasing use of the regional language among youth. In creating this Galician world, GADIS discursively paints itself as a defender of all things Galician, which has led it to become “a campaña de maior éxito do momento” (Souto 2008, 199).

Visible light mediated, metal-free carbene transfer reactions of diazoalkanes with propargylic alcohols

2019 ◽  
Vol 55 (33) ◽  
pp. 4881-4884 ◽  
Author(s):  
Feifei He ◽  
Rene M. Koenigs
Keyword(s):  
Visible Light ◽  
Transfer Reactions ◽  
High Yield ◽  
Propargylic Alcohols ◽  
Metal Free ◽  
Sterically Demanding ◽  
Donor Acceptor ◽  
Carbene Transfer

The photolysis of donor–acceptor diazoalkanes in the presence of propargylic alcohols furnishes valuable, sterically demanding tetra-substituted cyclopropenes in high yield under metal-free conditions.

Pyruvic acid proton and hydrogen transfer reactions in clusters

2019 ◽  
Vol 21 (16) ◽  
pp. 8221-8227 ◽  
Author(s):  
Kateryna Grygoryeva ◽  
Milan Ončák ◽  
Andriy Pysanenko ◽  
Michal Fárník
Keyword(s):  
Pyruvic Acid ◽  
Molecular Beam ◽  
Hydrogen Transfer ◽  
Transfer Reactions ◽  
Ion Chemistry ◽  
Acid Proton ◽  
Beam Experiment ◽  
Hydrogen Transfer Reactions

We investigate ion chemistry in pyruvic acid (PA) clusters in a molecular beam experiment.

scholarly journals Alternatives as sources of semantic dependency

2015 ◽  
pp. 406
Author(s):  
Anamaria Falaus
Keyword(s):  
Research Program ◽  
Adequate Description ◽  
Polarity Sensitivity ◽  
Restricted Distribution ◽  
Two Factors ◽  
Principled Explanation ◽  
Epistemic Constraint ◽  
Semantic Dependency ◽  
The Way

This paper focuses on the properties of the Romanian determiner 'vreun', and has two objectives. First, it seeks to provide an adequate description of its restricted distribution. Refining previous observations in the literature (Farkas 2002, 2006), I argue that the occurrence of 'vreun' in intensional contexts is sensitive to epistemic alternatives, and put forward a generalization that captures its use (‘the epistemic constraint’). Second, we aim to provide an explanation for the observed pattern, in a way that situates 'vreun' in a broader typology of dependent indefinites. The proposed account is couched in a unified, alternative-based approach to polarity-sensitivity, due to Chierchia (2006 et seq). In line with this theory, we reduce the differences between 'vreun' and other dependent indefinites to essentially two factors: (i) the types of alternatives these items activate and (ii) the way these alternatives are factored into meaning by alternative-sensitive operators. The present paper can be regarded as part of a more general research program which aims to understand the parameters of variation among dependent indefinites and to seek a principled explanation for the attested diversity.

scholarly journals Grief: The Epidemic Within an Epidemic

2020 ◽  
pp. 104990912097879
Author(s):  
Sarah Elizabeth Petry ◽  
Dalton Hughes ◽  
Anthony Galanos
Keyword(s):  
Prolonged Grief ◽  
Social Distancing ◽  
Cdc Guidelines ◽  
Human Touch ◽  
A Current ◽  
The Way

COVID-19 has not only dramatically changed the way we live, it has also impacted how we die and how we grieve. With more and more Americans dying in ICU settings, away from family, and more funerals being held virtually, the pandemic has seriously curtailed normal expressions of grief and cultural mourning. Given the CDC guidelines for funerals and social distancing, simple human touch is no longer a mitigating force against prolonged grief. So, while one epidemic has a face and a name, we point to a second, more silent yet potentially equally devastating one, unacknowledged grief, and emphasize how policy can be a current therapeutic. We can wait for a vaccine, but we can also act now through thoughtful policymaking that acknowledges this second epidemic.

From Amines to Alkynes – Lighting the Way

2018 ◽  
Author(s):  
Dorota Gryko ◽  
Michał Ociepa ◽  
Joanna Turkowska
Keyword(s):  
Primary Amine ◽  
Pyridinium Salts ◽  
Mechanistic Studies ◽  
Molecular Scaffolds ◽  
Metal Free ◽  
Mild Conditions ◽  
The Way

We present a metal-free photoredox strategy for the formation of Csp3-Csp bonds from redox-activated primary amine derivatives. The developed reaction of 2,4,6-triphenylpyridiniu salts with alkynyl tosylates, leading to functionalized alkynes , is easily scalable, offers broad substrate scope, high chemoselectivity, and mild conditions. Its potentials also highlighted by diversification of complex molecular scaffolds. Moreover, mechanistic studies contribute to the elucidation of unexpected differences in reactivity of primary, secondary and alkyl pyridinium salts.

From Amines to Alkynes – Lighting the Way

2018 ◽  
Author(s):  
Dorota Gryko ◽  
Michał Ociepa ◽  
Joanna Turkowska
Keyword(s):  
Primary Amine ◽  
Pyridinium Salts ◽  
Mechanistic Studies ◽  
Molecular Scaffolds ◽  
Metal Free ◽  
Mild Conditions ◽  
The Way

We present a metal-free photoredox strategy for the formation of Csp3-Csp bonds from redox-activated primary amine derivatives. The developed reaction of 2,4,6-triphenylpyridiniu salts with alkynyl tosylates, leading to functionalized alkynes , is easily scalable, offers broad substrate scope, high chemoselectivity, and mild conditions. Its potentials also highlighted by diversification of complex molecular scaffolds. Moreover, mechanistic studies contribute to the elucidation of unexpected differences in reactivity of primary, secondary and alkyl pyridinium salts.

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