Results 51 to 60 of about 82,507 (282)

Asymmetric [4+2]-cycloaddition of Anthracene Derivatives via Hydrazone Activation [PDF]

open access: yes, 2023
Enantio- and diastereoselective dearomative [4+2]-cycloaddition reaction between N,N-dimethylhydrazone derived from 9-anthracenecarbaldehyde and α,β-unsaturated aldehydes is reported.
Jakub, Ossowski   +3 more
core   +1 more source

Non-K Region Disubstituted Pyrenes (1,3-, 1,6- and 1,8-) by (Hetero)Aryl Groups—Review

open access: yesMolecules, 2019
Disubstituted pyrenes at the non-K region by the same or different (hetero)aryl groups have proven to be an increasingly interesting area of research for scientists over the last decade due to their optical and photophysical properties.
Dawid Zych
doaj   +1 more source

Highly Regioselective Construction of Spirocycles via Phosphine-Catalyzed [3 + 2]-Cycloaddition

open access: yes, 2016
A direct entry to spirocycles with low to moderate regioselectivity was achieved by triphenylphosphine-catalyzed [3 + 2]-cycloaddition of active exo-methylenecycles (1) and ethyl 2,3-butadienoate (2).
Xiyan Lu (1470865)   +2 more
core   +1 more source

Photocatalytic Cycloaddition Reaction of Triarylphosphines with Alkynes Forming Cyclic Phosphonium Salts [PDF]

open access: yes, 2021
Herein reported is a photocatalytic cycloaddition reaction of triarylphosphines with alkynes. Phosphonium salts of unique bicyclic structures are synthesized through a radical pathway under mild reaction conditions. The phosphonium salts are subjected to
Yusuke, Masuda   +2 more
core   +2 more sources

Catalytic [4+2]- and [4+4]-cycloaddition using furan-fused cyclobutanone as a privileged C4 synthon

open access: yesNature Communications
Cycloaddition reactions play a pivotal role in synthetic chemistry for the direct assembly of cyclic architectures. However, hurdles remain for extending the C4 synthon to construct diverse heterocycles via programmable [4+n]-cycloaddition.
Kemiao Hong   +7 more
doaj   +1 more source

Synthesis and Characterization of 1-Hydroxy-5-Methyltetrazole and Its Energetic Salts

open access: yesMolecules
The objective of this work was the synthesis and characterization of novel, insensitive high explosives. 1-hydroxy-5-methyltetrazole served as both a scaffold and anion for preparing various nitrogen-rich energetic salts. The compounds were characterized
Lukas J. Eberhardt   +3 more
doaj   +1 more source

Cycloadditions of Cyclohexynes and Cyclopentyne [PDF]

open access: yesJournal of the American Chemical Society, 2014
We report the strategic use of cyclohexyne and the more elusive intermediate, cyclopentyne, as a tool for the synthesis of new heterocyclic compounds. Experimental and computational studies of a 3-substituted cyclohexyne are also described. The observed regioselectivities are explained by the distortion/interaction model.
Medina, Jose M   +4 more
openaire   +4 more sources

Emerging experimental and computational methods for studying redox‐regulated structural transitions

open access: yesFEBS Letters, EarlyView.
Redox reactions can reshape proteins and alter how they behave in cells, with important consequences for health and disease. This review explores emerging experimental and computational approaches for discovering these redox‐sensitive protein switches, revealing their structural effects, and predicting their behavior, opening new opportunities to ...
Tasneem Rass   +2 more
wiley   +1 more source

Synthesis and reinvestigation of tetrazocines [PDF]

open access: yes, 2004
This thesis is concerned with the study of tetrazocines. These rare, eight-membered ring systems containing four nitrogen atoms are in the infancy of their development. Little is known of their potential application, properties and generation.
Healy, Cathal
core   +2 more sources

Ferrocenyl Substituted Stannanethione and Stannaneselone

open access: yesMolecules
Heavier element analogues of a ketone, a C=O double-bond compound, have been fascinating compounds from the viewpoint of main-group element chemistry because of their unique structural features and reactivity as compared with those of a ketone, which ...
Keisuke Iijima   +2 more
doaj   +1 more source

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