Results 171 to 180 of about 1,971 (208)

ChemInform Abstract: DISPIRO‐DITHIETANE

Chemischer Informationsdienst. Organische Chemie, 1970
AbstractDie Cycloalkanone (Ia)‐(Ie) reagieren bei Behandlung mit Formaldehyd in Gegenwart von Alkali zu den Tetra‐methylol‐Verbindungen (II), die zu (III) mesyliert wurden.
G. SEITZ, W. D. MIKULLA
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ChemInform Abstract: Syntheses of Dispiro[2.1.4.1]decane and Dispiro[2.0.3.3]decane.

ChemInform, 2001
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.
John E. Baldwin, Maryann E. Keene, Rajesh Shukla   +2 more
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Synthesis and rearrangement of dispiro[2.0.3.4]-, dispiro-[3.0.3.3]- and dispiro[2.1.3.3]undecanes - preferred C4-C5 over C3-C4 and C4-C3 over C5-C6 rearrangements

Tetrahedron, 1994
Abstract The dispiranes 10–12 have been synthesized and rearranged by treatment with acids. With 10, an initial C3-C4 ring enlargement leads to [3.3.3]propellane 21, with 11, an initial C4-C3 ring contraction leads to pentalene 37, and with 12, an initial C4-C5 ring enlargement leads to 42, 43, 44 or 45, depending on the reagent used.
Lutz Fitjer, Beate Rissom, Andreas Kanschik, Ernst Egert   +3 more
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Darstellung und Struktur von Dispiro‐diazaphosphetidinen

Chemische Berichte, 1977
AbstractDurch thermolytische Abspaltung von Fluortrimethylsilan aus den 2,2‐Difluor‐4,4,5,5‐tetrakis‐(trifluormethyl)‐2‐trimethylsilylamino‐1,3,2λ5‐dioxaphospholanen 1 und 2 werden erste Vertreter 3 und 4 von dispirocyclisch angeordneten fünf‐ und viergliedrigen Ringen synthetisiert.
James Andrew Gibson, Gerd‐Volker Röschenthaler, Dietmar Schomburg, William S. Sheldrick   +3 more
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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
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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
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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
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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
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ChemInform Abstract: Rod‐Like Dispiro(5.1.5.2) Compounds.

ChemInform, 1992
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.
J. BOETTCHER, R. HARTMANN, F. VOEGTLE
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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
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