Results 121 to 130 of about 1,772 (162)
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Acta Crystallographica Section C Crystal Structure Communications, 1997
The crystal structure of 5,5-dimethyl-1,3-cyclohexanedione, C8H12O2, was determined at 133 K. The cyclohexene ring exhibits an envelope conformation. The molecular geometry and the crystal packing - which is stabilized by a hydrogen bond - agree well with the two room-temperature structure determinations.
M. Bolte, M. Scholtyssik
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The crystal structure of 5,5-dimethyl-1,3-cyclohexanedione, C8H12O2, was determined at 133 K. The cyclohexene ring exhibits an envelope conformation. The molecular geometry and the crystal packing - which is stabilized by a hydrogen bond - agree well with the two room-temperature structure determinations.
M. Bolte, M. Scholtyssik
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Synthetic Communications, 1973
Abstract In connection with our synthetic approach to pentacyclic triterpenes,1 we have required substantial amounts of 2,5,5-trimethyl-1,3-cyclohexanedione (methyldimedone, 2), which is available by methylation of dimedone (1).2 However, methylation may also afford the 2,2-dimethyl product 3, the methyl ether 4, and the C, O-dimethyl product 5.
Robin D. Clark +2 more
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Abstract In connection with our synthetic approach to pentacyclic triterpenes,1 we have required substantial amounts of 2,5,5-trimethyl-1,3-cyclohexanedione (methyldimedone, 2), which is available by methylation of dimedone (1).2 However, methylation may also afford the 2,2-dimethyl product 3, the methyl ether 4, and the C, O-dimethyl product 5.
Robin D. Clark +2 more
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Dimedone and phenylazo dimedone chelates of europium as emitters in polymers
Journal of Applied Polymer Science, 2011AbstractTransparent polymers when incorporated with strongly fluorescent europium chelates were found to be responding to excitation with UV radiation. In this work, two novel europium chelates have been synthesized using the β‐diketones dimedone and phenylazo dimedone along with 1,10‐phenanthroline.
Susannah Seth, K. K. Aravindakshan
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Journal für Praktische Chemie, 1979
Vilsmeier‐Reaction on Dimedone.The Vilsmeier‐reaction has been studied in detail for a special cyclic β‐diketone, dimedone. It was shown, that the first step in this reaction is the formation of the corresponding β‐chlorovinylketone. 3‐Chloro‐5,5‐dimethyl‐cyclohex‐2‐en‐one‐(1) 2, 2,4‐dichloro‐6,6‐dimethyl‐1‐formyl‐cyclohexa‐1,3‐diene 3 und 2,4‐dichloro‐
Manfred Pulst +2 more
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Vilsmeier‐Reaction on Dimedone.The Vilsmeier‐reaction has been studied in detail for a special cyclic β‐diketone, dimedone. It was shown, that the first step in this reaction is the formation of the corresponding β‐chlorovinylketone. 3‐Chloro‐5,5‐dimethyl‐cyclohex‐2‐en‐one‐(1) 2, 2,4‐dichloro‐6,6‐dimethyl‐1‐formyl‐cyclohexa‐1,3‐diene 3 und 2,4‐dichloro‐
Manfred Pulst +2 more
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Packing considerations of bis-dimedone derivatives
Acta Crystallographica Section C Crystal Structure Communications, 2001We have determined the crystal structures of 2,2'-(4-fluorophenyl)methylenebis(3-hydroxy-5,5-dimethyl-2-cyclohexen-1-one), C(23)H(27)FO(4), (I), 2,2'-(4-chlorophenyl)methylenebis(3-hydroxy-5,5-dimethyl-2-cyclohexen-1-one), C(23)H(27)ClO(4), (II), 2,2'-(4-hydroxyphenyl)methylenebis(3-hydroxy-5,5-dimethyl-2-cyclohexen-1-one), C(23)H(28)O(5), (III), 2,2'-(
M, Bolte, A, Degen, S, Rühl
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Oxidation Products of Retinylidene Dimedone
Helvetica Chimica Acta, 1980AbstractSeveral oxidation products of the retinoid retinylidene dimedone (RD) have been synthesized and characterized for biological testing in the expectation that they may be found as metabolites of RD.
Nancy Acton, Arnold Brossi
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The Crystal Structure of Dimedone
Canadian Journal of Chemistry, 1975Dimedone, C8H12O2, crystallizes with monoclinic symmetry, a = 10.079(7), b = 6.835(3), c = 12.438(4) Å, β = 110.24(5)°, space group P21/n and Z = 4. The structure of this compound was solved by direct methods and refined by full-matrix least-squares techniques using 1205 unique reflections to a final R of 0.047.
Ishwar Singh, Crispin Calvo
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ChemInform Abstract: METHYLATION OF DIMEDONE
Chemischer Informationsdienst, 1974AbstractDie Methylierung von Dimedon (I) mit Methyljodid in Gegenwart verschiedener Basen liefert die Verbindungen (II)‐(V).
R. D. CLARK +2 more
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Synthesis of Antipyrine Derivatives Derived from Dimedone
Chinese Journal of Chemistry, 2007AbstractCoupling of dimedone with the diazonium salt of 4‐aminoantipyrine afforded 2,3‐dimethyl‐4‐[2‐(5,5‐dimethyl‐ 2,6‐dioxocyclohex‐2‐ylidend)‐hydrazino]‐5‐oxo‐1‐phenylpyrazoline (3). Reaction of 3 with excess phenylhydrazine gave the mixed trishydrazone derivative 4.
E. S. H. El Ashry +3 more
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Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1996
Abstract A detailed study of the 270 MHz 1 H and 67 MHz 13 C NMR spectra of dimedone is reported. J CH coupling constants for the keto and enol forms are presented. In CDCl 3 solution, the C-4 and C-6 carbons of the bulk polymeric enol tautomer are equivalent, with an averaged coupling to C-2, whilst they appear to be magnetically different in ...
Richard J. Cremlyn +2 more
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Abstract A detailed study of the 270 MHz 1 H and 67 MHz 13 C NMR spectra of dimedone is reported. J CH coupling constants for the keto and enol forms are presented. In CDCl 3 solution, the C-4 and C-6 carbons of the bulk polymeric enol tautomer are equivalent, with an averaged coupling to C-2, whilst they appear to be magnetically different in ...
Richard J. Cremlyn +2 more
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