Results 161 to 170 of about 1,879 (233)

Ring inversion in dispiro[2,2,2,2]decane

Journal of the Chemical Society D: Chemical Communications, 1970
The title compound (I), which contains a cyclohexane ring with spiro-bound cyclopropanes at either end, has been found to have a barrier (Ea) to ring inversion of 12·1 ± 0·4 kcal mol–1; the axial–equatorial chemical-shift difference is 1·21 p.p.m., an unusually large value.
Joseph B. Lambert, Jack L. Gosnell, David S. Bailey, Linda G. Greifenstein   +3 more
openaire   +1 more source

Selective membrane disrupting dispiro-oxindole Dehydrocostuslactone hybrids with potent anti-MRSA, antibiofilm, and synergistic activity.

Bioorganic chemistry (Print)
A structurally diverse library of dispiro-oxindole dehydrocostuslactone (DHC) hybrids was synthesized via a modular, catalyst-free, regio- and stereoselective three-component 1,3-dipolar cycloaddition involving natural DHC, isatin derivatives, and amino ...
Anil Bhushan, Arti Rathore, Vivek Singh Baghel, Shifa Firdous, Urvashi Dhiman, Biplab Sarkar, Yogesh P. Bharitkar, Prasoon Gupta, Avisek Mahapa, R. Phatake   +9 more
semanticscholar   +1 more source

Two Syntheses of Dispiro[2.1.3.2]decane

Organic Letters, 1999
Dispiro[2.1.3.2]decane, the first of the five possible dispirodecanes constituted from one three-membered, one four-membered, and one five-membered ring to be synthesized, has been prepared efficiently in four steps from methylenecyclopropane and again in five steps from methylenecyclobutane.
John E. Baldwin, Rajesh Shukla
openaire   +1 more source

Phosphorus-nitrogen compounds: Part 71. Novel unsymmetrically-substituted dispiro-cyclotriphosphazenes: Synthesis, characterization, antituberculosis activity and phototunable charge storage studies

New Journal of Chemistry, 2023
The aim of this research is to synthesize and characterize new organic-inorganic hybrid multi-heterocyclic dichlorodispiro(N/N)cyclotriphosphazenes and to clarify their antituberculosis activities.
Reşit Cemaloğlu, İ. Berberoğlu, Mehtap Özgür, Arzu Binici, Nuran Asmafiliz, Z. Kılıç, R. Guzel, G. Erdal, Hülya Şimşek, T. Hökelek   +9 more
semanticscholar   +1 more source

Synthesis of Chiral Dispiro‐indolinone‐pyrrolidine‐rhodanines Using (R)/(S)‐1‐(2,4‐dimethoxyphenyl)ethylamine

ChemistrySelect
The use of (R) or (S)‐1‐(2,4‐dimethoxyphenyl)ethylamines as starting compounds makes it possible to obtain the individual enantiomers of dispiro‐indolinone‐pyrrolidine‐rhodanines with a yield of up to 53% based on a three‐step synthesis through the ...
Anton D. Degtiarev, Aleksandr A. Barashkin, Y. Grishin, V. Roznyatovsky, Viktor A. Tafeenko, E. Tarasenko, E. Beloglazkina   +6 more
semanticscholar   +1 more source

ChemInform Abstract: Polyspiranes. Part 23. Cascade Rearrangements. Part 18. Synthesis and Rearrangement of Dispiro(3.1.3.2)‐, Dispiro(3.0.3.3)‐ and Dispiro(3.0. 4.2)undecanes ‐ New Entries to (3.3.3)Propellanes.

ChemInform, 1995
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
L. FITJER, A. KANSCHICK, M. MAJEWSKI
openaire   +1 more source

Synthesis of Chiral Dispiro‐Indolinone‐Pyrrolidine‐Imidazolones Using (R) or (S)‐1‐(2,4‐Dimethoxyphenyl)Ethyl Amine

ChemistrySelect
Chiral dispyrindolinone‐pyrrolidine‐indolinones were obtained using a four‐step synthetic sequence: (1) preparation of thioureas and 5‐arylidene‐thiohydantoins from (R) or (S)‐1‐(2,4‐dimethoxyphenyl)ethylamine; (2) 1,3‐cycloaddition reaction of the ...
V. Polyakov, Aleksandr A. Barashkin, Y. Grishin, E. Tarasenko, E. Beloglazkina   +4 more
semanticscholar   +1 more source

Spectroscopic study of the dispiro-1,2,4,5-tetroxane (cyclohexanone diperoxide)

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2008
The aim of this work is to present results derived from experimental IR and UV spectra and theoretical studies of DPCH, in order to get a more deeper insight on the physicochemical properties of this compound to gain a more deep knowledge of its action, helping in the design of new compounds with antimalaric effects.
J M, Romero, N L, Jorge, M E, Gómez-Vara, A H, Jubert, E A, Castro   +4 more
openaire   +2 more sources

A New Access to Dispiro 7‐Oxaindazolidines Spiroxindole Derivatives.

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Rathna Durga R. S. Manian, Jayadevan Jayashankaran, Raghavachary Raghunathan   +2 more
openaire   +1 more source

Diastereoselective assembly of dispiro-cyclopentene-linked bisoxindoles via annulation involving isatylidene malononitriles and benzylamines.

Organic and biomolecular chemistry
A cascade reaction utilizing benzylamines and two equivalents of isatylidene malononitriles in alcohols effectively produces dispiro[indoline-cyclopentapyrimidine-indoline] structures with high chemical yields, reaching up to 93%, and remarkable ...
Issa Yavari, Mahmoud Ahmadi, P. Ravaghi, Ramin Mohsenzadeh   +3 more
semanticscholar   +1 more source