Results 31 to 40 of about 9,758 (193)

1,3-Bis(4-methylbenzoyl)-2,4-bis(2,4,5-trimethoxyphenyl)cyclobutane

IUCrData, 2017
The title compound, C38H40O8, possess an inversion centre at the centroid of the four-membered ring. The dihedral angle between the methylbenzene and trimethoxybenzene rings is 46.19 (8)°.
K. R. Raghavendra, S. Naveen, N. Renuka, M. G. Prabhudeva, N. K. Lokanath, K. Ajay Kumar   +5 more
doaj   +1 more source

2α-Acetoxy-5α-methoxycaryophyll-8(15)-en-3-one

Acta Crystallographica Section E, 2009
The title compound, C18H28O4, crystallizes with two molecules in the asymmetric unit. Both molecules have similar conformations of nine-membered rings, which are trans-fused with cyclobutane fragments.
Wen Zhang, Hong-Quan Duan
doaj   +1 more source

Crystal structures of (E)-5-(4-methylphenyl)-1-(pyridin-2-yl)pent-2-en-4-yn-1-one and [3,4-bis(phenylethynyl)cyclobutane-1,2-diyl]bis(pyridin-2-ylmethanone)

Acta Crystallographica Section E: Crystallographic Communications, 2020
Recrystallization of (E)-5-phenyl-1-(pyridin-2-yl)pent-2-en-4-yn-1-one at room temperature from ethylene glycol in daylight afforded [3,4-bis(phenylethynyl)cyclobutane-1,2-diyl)bis(pyridin-2-ylmethanone], C32H22N2O2 (3), while (E)-5-(4-methylphenyl)-1 ...
Ivan E. Ushakov, Ivan S. Odin, Pavel A. Gloukhov, Alexander A. Golovanov, Pavel V. Dorovatovskii, Anna V. Vologzhanina   +5 more
doaj   +1 more source

Diversifying molecular and topological space via a supramolecular solid-state synthesis: a purely organic mok net sustained by hydrogen bonds

IUCrJ, 2019
A three-dimensional hydrogen-bonded network based on a rare mok topology has been constructed using an organic molecule synthesized in the solid state. The molecule is obtained using a supramolecular protecting-group strategy that is applied to a solid ...
Shalisa M. Oburn, Michael A. Sinnwell, Devin P. Ericson, Eric W. Reinheimer, Davide M. Proserpio, Ryan H. Groeneman, Leonard MacGillivray   +6 more
doaj   +1 more source

Photogenerated Oxetanes as a Gateway to Uphill Cyclopropanation

Angewandte Chemie International Edition, EarlyView.
An atom‐economical route to densely functionalized cyclopropanes from furans and photochemically activated aldehydes is enabled by a unique oxetane‐to‐cyclopropane rearrangement. These cyclopropanes can be used to access complex bioactive scaffolds and serve as a platform for asymmetric cyclopropane synthesis.
Tim Köglmeier, Thomas J. Tiefel, Oliver Reiser   +2 more
wiley   +1 more source

Degradable Alternating Copolymers With Strained Cyclobutane Backbones via Photocontrolled RAFT Polymerization

Angewandte Chemie International Edition, EarlyView.
A photocontrolled RAFT strategy enables the alternating copolymerization of 1,3‐disubstituted bicyclo[1.1.0]butanes with electron‐deficient comonomers, affording well‐defined copolymers bearing strained cyclobutane backbones. A high degree of alternation, tunable molecular weights, and excellent end‐group fidelity are achieved through a CTA‐mediated ...
Xia Hu, Hongsik Kim, Lianqian Wu, Yi Jiang, Tae‐Lim Choi   +4 more
wiley   +1 more source

N‐Aryl Acridone Derivatives as Effective Catalysts for Energy Transfer Reactions

Chemistry – A European Journal, EarlyView.
Acridones derivatives have high triplet energy, are simple accessible, and could be used in challenging [2+2] ENT reactions. ABSTRACT Organic photocatalysts capable of promoting high‐energy triplet energy transfer (EnT) remain limited, particularly for demanding [2+2] photocycloaddition reactions.
Francesco Calogero, Gaetano D'Onghia, Federica Fina, Zakaria Ziani, Luca Sensoli, Andrea Gualandi, Andrea Fermi, Paola Ceroni, Pier Giorgio Cozzi   +8 more
wiley   +1 more source

Synthesis of Cyclobutane Serine Analogues

The Journal of Organic Chemistry, 2004
In this paper, we describe a thermal [2 + 2] cycloaddition involving 2-acylaminoacrylates as electron-poor acceptor alkenes, a reaction that involves a Michael-Dieckmann-type process. The reaction gives rise to a new substituted cyclobutane skeleton that can be transformed into amino acid derivatives.
Avenoza, A., Busto, J.H., Canal, N., Peregrina, J.M.   +3 more
openaire   +4 more sources

Stereochemical Control in the Matteson Reaction

Chemistry – A European Journal, EarlyView.
The Matteson homologation is a highly versatile method for the stereoselective insertion of carbenoids into boronic esters. Through iterative application of the process, complex chiral molecules can be synthesized. The stereoselectivity of the reaction is determined by a chiral diol incorporated in the boronic ester.
Hae Mo Lee, Christoph Hirschhäuser
wiley   +1 more source

Preparation of Enantioenriched Spirocyclic Scaffolds Transferring Axial Chirality from Borylalkylidenecycloalkanes

ChemistryEurope
Herein, an efficient transference of axial chirality from enantiomerically enriched borylalkylidenecycloalkanes to point chirality is disclosed through the synthesis of spirocyclic valuable compounds via cyclopropanation, borylcyclopropanation ...
Nerea Iragorri, Josebe Hurtado, Jose L. Vicario, Efraím Reyes, Elena Fernández   +4 more
doaj   +1 more source