Results 41 to 50 of about 161 (128)

Crystal structure and molecular Hirshfeld surface analysis of acenaphthene derivatives obeying the chlorine–methyl exchange rule

Acta Crystallographica Section E: Crystallographic Communications, 2019
Instances of crystal structures that remain isomorphous in spite of some minor changes in their respective molecules, such as change in a substituent atom/group, can provide insights into the factors that govern crystal packing.
R. Sribala, S. Indhumathi, R.V. Krishnakumar, N. Srinivasan   +3 more
doaj   +1 more source

Recent Advancements in the Cyclization Strategies of 1,3‐Enynes Towards the Synthesis of Heterocyclic/Carbocyclic Frameworks

Chemistry – An Asian Journal, Volume 20, Issue 8, April 17, 2025.
In this review, the advancements in the cyclization of 1,3‐enynes to construct structurally diverse heterocyclic and carbocyclic frameworks are portrayed comprehensively. Divergent cyclization protocols along with mechanistic aspects for key transformations are also detailed. Abstract 1,3‐Enynes have demonstrated their utility as valuable precursors to
Akash P. Sakla, Shams Aaghaz, Shujauddin Ahmed, Naziya Neshat, Ahmed Kamal   +4 more
wiley   +1 more source

Organocatalyzed Enantioselective [3+2] Cycloaddition Reactions for Synthesis of Dispiro[benzothiophenone-indandione-pyrrolidine] Derivatives

Molecules
An organocatalytic enantioselective [3+2] cycloaddition reaction involving 2-arylidene-1,3-indandiones and N-2,2-difluoroethylbenzothiophenone imines was developed.
Hong-Yan Liu, Da-Ming Du
doaj   +1 more source

Design, synthesis, and biological evaluation of multifunctional dispiro chromeno-indenoquinoxaline hybrids as dual anticancer and antibacterial agents with metal-ion sensing ability [PDF]

RSC Advances
We have developed for the first time an aqueous-mediated 1,3-dipolar cycloaddition between indenoquinoxaline-derived nitrones and structurally diverse 2H-chromenes for the efficient construction of dispiro-chromeno-indenoquinoxaline frameworks.
Kamalika Prusty, S. S. S. S. Sudha Ambadipudi, Suhasini Mohapatra, Tankadhara Behera, Bhabani Shankar Panda, Gopinatha Panigrahi, Sabita Nayak, Seetaram Mohapatra, Akankhya Mohanty, Jyotiprabha Rout, Chita Ranjan Sahoo, V. Lakhsma Nayak   +11 more
doaj   +1 more source

Revisiting Butafulvene Formation by Thermal Dimerization of Fluorene‐Based Dialkynes ‐ Effects of Aromatic Substituents

Chemistry – A European Journal, Volume 31, Issue 1, January 2, 2025.
The dimerization of fluorene based dialkynes into planarized butafulvenes is rediscovered and its scope expanded. The stabilities of the isobenzenes involved in the formation are explored and the often proposed antiaromaticity is investigated for these near planar derivatives. Abstract Butafulvenes, together with pentafulvenes and [3]radialenes, form a
Moritz P. Schuldt, Tatjana Maximenko, Frank Rominger, Michael Mastalerz   +3 more
wiley   +1 more source

Heavier Diferrocenylpnictogenium Ions

Chemistry – A European Journal, Volume 31, Issue 1, January 2, 2025.
Four shades of pastel: The synthesis, reactivity and in‐depth characterisation of cationic group 15 carbene analogues is reported. Abstract The synthesis, characterization and reactivity of the diferrocenylphosphenium ion [Fc2P]+ was extended to the heavier diferrocenylpnictogenium ions, [Fc2E]+ (E=As, Sb, Bi).
Corina Stoian, Marian Olaru, Serhiy Demeshko, Malte Fischer, Stefan Mebs, Emanuel Hupf, Jens Beckmann   +6 more
wiley   +1 more source

Synthesis of functionalized tetrahydro-dispiro[pyrazolone 4, 2′-pyran-5′, 4″-pyrazolone] scaffolds via an Oxa-Michael-initiated cascade [4 + 2] annulation reaction using pyrazoledione-derived MBH-alcohols

Results in Chemistry
In this study, an efficient protocol was developed for synthesizing tetrahydro-dispiro[pyrazolone 4, 2′-pyran-5′, 4″-pyrazolone] scaffolds, using pyrazoledione-derived MBH alcohols and arylidene pyrazolones.
Xiaoming Zhou, Juan Du, JiPeng Yuan, Xuehan Wang, Hongli Yang, Xuekun Wang, Zhenzhen Gao   +6 more
doaj   +1 more source

A Diastereoselective Synthesis of Dispiro[oxindole-cyclohexanone]pyrrolidines by 1,3-Dipolar Cycloaddition

Molecules, 2017
For the first time, arylmethylidene cyclohexanones that are non-symmetrical due to the presence of peripheral substituents were studied in 1,3-dipolar cycloaddition reactions.
Alexander Anis’kov, Irina Klochkova, Roman Tumskiy, Alevtina Yegorova   +3 more
doaj   +1 more source

Adventures in the Chemistry of Multicomponent and Domino Reactions

European Journal of Organic Chemistry, Volume 27, Issue 24, June 24, 2024.
The present article presents a personalized review of multicomponent and domino reactions directed towards the synthesis of complex heterocyclic products. Chemistry includes the combination of Knoevenagel with hetero‐Diels‐Alder reactions, [3+2] cycloadditions and enamine cyclizations.
Peter Langer
wiley   +1 more source

Crystal structure of 2'H,7'H-dispiro[fluorene-9,2'-dibenzo[c,e]- oxepine-7',9"-fluorene], C38H24O

Zeitschrift für Kristallographie - New Crystal Structures, 2003
C38H24O, monoclinic, P121/n1 (No. 14), a = 10.737(2) Å, b = 16.963(3) Å, c = 15.246(3) Å, β = 109.30(3)°, V = 2620.8 Å3, Z = 4, Rgt(F) = 0.088, wRref(F2) = 0.252, T = 293 K.
Ibragimov B. T., Weber E., Beketov K. M., Makhkamov K. K.   +3 more
doaj   +2 more sources