Results 31 to 40 of about 34,362 (322)

Microwave Assisted Synthesis of Some New Heterocyclic Spiro-Derivatives with Potential Antimicrobial and Antioxidant Activity

open access: yesMolecules, 2010
Homophthalic anhydride reacts with different aromatic amines to produce N-substituted homophthalimides. Bromination of the latter produces 4,4-dibromo-homophthalimide derivatives that can be used as precursors for spiro-derivatives.
Mohamed Mohamed Youssef   +1 more
doaj   +1 more source

Synthesis and reactivity of spiro-fused β-lactams [PDF]

open access: yes, 2011
A
D'hooghe, Matthias   +2 more
core   +2 more sources

Novel Rearrangements in the Reactions Directed Toward Preparation of Spiro-N,N-ketals: Reactions of Naphthalene-1,8-diamine with Ninhydrin and Isatin

open access: yesMolecules, 2012
Spiro-N,N-ketal 5, consisting of a phthaloperine heterocyclic ring and a naphtha[1,8-ef][1,4]diazepine ring, was obtained along with spiro-N,N-ketal 2 via 2,2-condensation in the reaction of ninhydrin with naphthalene-1,8-diamine.
Keiji Kobayashi   +4 more
doaj   +1 more source

Spiro heterocyclic compounds. V. Synthesis of spiro(homophthalimide-4,4'-(4'H-pyran)) compounds. [PDF]

open access: yesChemical and Pharmaceutical Bulletin, 1982
AbstractAus dem Phthalonimid (I) wird in einer Knoevenagel‐ Kondensation mit Malononitril (II) das Derivat (III) hergestellt, das mit einigen Methylen‐aktiven Verbindungen (IV) zu den Spiroverbindungen (V) reagiert.
Hirotaka Otomasu, Teruhisa Fujimaki
openaire   +3 more sources

Excimer formation by steric twisting in carbazole and triphenylamine-based host materials [PDF]

open access: yes, 2015
This paper presents a detailed spectroscopic investigation of luminescence properties of 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP) and N,N,N’,N’-tetraphenylbenzidine (TAD) in solutions and neat films.
Alexander Rudnick (1351473)   +7 more
core   +3 more sources

Phenalene-phosphazene complexes: effect of exocyclic charge densities on the cyclotriphosphazene ring system [PDF]

open access: yes, 1988
The synthesis and properties of a new series of 1,9-diamino-substituted phenalene complexes of the cyclotriphosphazene ring system is described. One of the compounds is shown to be amphoteric, and this behavior allows an examination of the response of ...
Chichester-Hicks, S. V.   +2 more
core   +1 more source

The tert-Amino Effect in Heterocyclic Chemistry. Synthesis of Spiro Heterocycles

open access: yesMolecules, 2005
The tert-amino reaction effect was examined. A new method to synthesize spiro heterocycles is presented. It was shown that the “tert-amino effect” could be applied to the formation of spiro-fused heterocycles.
Y. Morzherin   +4 more
doaj   +1 more source

Synthesis and evaluation of the antioxidant activity of new spiro-1,2,4-triazine derivatives applying Ag/Fe3O4/CdO@MWCNT MNCs as efficient organometallic nanocatalysts

open access: yesFrontiers in Chemistry, 2022
We applied the Petasites hybridus rhizome water extract as green media so that Ag/Fe3O4/CdO@ multi-walled carbon nanotubes magnetic nanocomposites (Ag/Fe3O4/CdO@MWCNTs MNCs) could be prepared.
Elham Ezzatzadeh   +3 more
doaj   +1 more source

An update on the synthesis and reactivity of spiro-fused β-lactams [PDF]

open access: yes, 2018
Beta-Lactam ring-containing compounds play a pivotal role in drug design and synthetic chemistry. Spirocyclic beta-lactams, representing an important beta-lactam subclass, have recently attracted considerable interest with respect to new synthetic ...
D'hooghe, Matthias, Dao Thi, Hang
core   +1 more source

Doming Modes and Dynamics of Model Heme Compounds [PDF]

open access: yes, 2002
Synchrotron far-IR spectroscopy and density-functional calculations are used to characterize the low-frequency dynamics of model heme FeCO compounds.
Czarnecki, Kazimierz   +6 more
core   +3 more sources

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