- 3,3-Dibenzylpentane-2,4-dione, C19H20O2
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The notable feature of the title compound is the non-planarity of the pentane-2,4-dione moiety.This fragment of the molecule adopts a significantly distorted S comformation with a dihedral angle of 62.1 (2) deg between the planes through C1-C2(=O1)-C3 and C3-C4(=O2)-C5.The molecular packing involves C-H...O close contacts.
- Judas, Nenad,Kaitner, Branko,Mestrovic, Ernest
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- PLATINUM COMPLEX, LUMINESCENT MATERIAL, ORGANIC ELECTROLUMINESCENT ELEMENT, DISPLAY DEVICE, AND ILLUMINATOR
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PROBLEM TO BE SOLVED: To provide a platinum complex excellent in blue purity. SOLUTION: The platinum complex is represented by the formula (1). [R11 to R14 are each independently a substituent; n11 and n12 are f
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Paragraph 0141; 0142; 0143
(2018/11/22)
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- PLATINUM COMPLEX, LUMINESCENT MATERIAL, ORGANIC ELECTROLUMINESCENT ELEMENT, DISPLAY DEVICE, AND ILLUMINATOR
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PROBLEM TO BE SOLVED: To provide a platinum complex excellent in blue purity. SOLUTION: A platinum complex is represented by the following formula 1. [R11 to R14 are H or a substituent; n11 and n12 are each inde
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Paragraph 0143
(2017/07/31)
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- PLATINUM COMPLEX, LUMINESCENT MATERIAL, ORGANIC ELECTROLUMINESCENT ELEMENT, DISPLAY, AND ILLUMINATOR
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PROBLEM TO BE SOLVED: To provide a platinum complex excellent in blue color purity. SOLUTION: The platinum complex is represented by the formula 1. [R11 to R14 are each independently a substituent; S11 to S14 ar
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Paragraph 0142-0143
(2016/10/09)
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- Facile nBu4NF mediated benzylation of congested 1,3-diketones
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Facile benzylation of 1,3-diketones is mediated by nBu4NF in THF- water. The reaction conditions are mild, the performance is simple, and the yields are high. Importantly, no O-alkylation side reactions or subsequent retro-Claisen C-C-bond clea
- Christoffers, Jens
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p. 117 - 122
(2007/10/03)
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- Cobalt-mediated alkylation of β-dicarbonyl compounds. Electrochemical evidence of cobalt(l) intermediate species and HPLC-MS detection of reaction intermediates
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The alkylation reactions of Co(II) acetylacetonate with alkyl halides are triggered by electrochemical reduction of the complex. This confirms Co(I) species as intermediates. HPLC-MS analysis of the reaction mixtures has permitted identification of some cobalt-containing intermediates involved in the alkylation reactions. Based on these results we propose a mechanistic hypothesis for the formation of dialkylation products and Co(III) acetylacetonate. Springer-Verlag Iberica 1997.
- Anhari,Gallardo,Vallribera
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- Mono- vs. dialkylation of carbanions. Effects of absolute and relative acidity of the conjugate carbon acids in selectivity control
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The title problem was investigated in the reaction of the dibromide 1 with carbanions 2a-2g covering a range greater than 15 pK units in DMSO. It was found that the bis(monoalkylated) product 3 arises exclusively or predominantly from the carbanions 2d-2g derived from the less acidic carbon acids 7d-7g whereas the cyclic product of dialkylation 4 prevails in the reaction of the carbanions 2a-2c derived from the more acidic carbon acids 7a-7c. The alkylation selectivity thus depends critically on the absolute acidity of the carbon acid participating in the reaction. Rationale for this novel, and on basis of earlier studies unexpected finding is provided in terms of eqs. (1)-(4).
- Ridvan, Ludek,Zavada, Jiri
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p. 14793 - 14806
(2007/10/03)
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- Mechanistic studies on the alkylation of pentane-2,4-dione through its Co(II) complex
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A mechanistic study on the alkylation of pentane-2,4-dione through its Co(II) complex in concentrated chloroform solutions indicates the operation of a "non carbon radical" chain mechanism based in the ability of cobalt to undergo redox processes between
- Vallribera, Adelina,Marquet, Jorge,Moreno-Manas, Marcial,Cayon, Eduard
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p. 6437 - 6450
(2007/10/02)
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- Selective α-Mono- and α,α-Dialkylations of 1,3-Diketones Using Solid Base Prepared from Sodium Ethoxide and Alumina
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The alkylation of 1,3-diketones with alkyl halides using a solid base prepared from sodium ethoxide and alumina was carried out.The amount of 0.4 mol of sodium ethoxide on 50 g of alumina showed by best reactivity for alkylation.Selective mono- and dialky
- Yoshihara, Nobutoshi,Kitagawa, Teruhiro,Ihara, Ikuko,Hasegawa, Sadao,Hasegawa, Tadashi
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p. 1185 - 1187
(2007/10/02)
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- Surface-mediated Solid-phase Reaction. Part 2. Highly Selective Mono- and Di-C-alkylation of 1,3-Dicarbonyl Compounds on the Surface of Alumina
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Highly selective mono- and di-C-alkylation of 1,3-dicarbonyl compounds with different, structurally varied alkyl halides has been achieved in high yields through a simple solvent-free reaction on the surface of alumina impregnated with sodium or potassium alkoxide.
- Ranu, Brindaban C.,Bhar, Sanjay
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p. 365 - 368
(2007/10/02)
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- C-ALKYLATION OF β-DIKETONES WITH BENZYLPYRIDINIUM SALTS. EVIDENCE FOR CHAIN RADICAL MECHANISMS
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1-(p-Substituted benzyl)-2,4,6-triphenylpyridinium cations react with β-diketone anions by mechanisms which depend on the para-substituent.The p-methoxybenzyl derivative undergoes SN1 displacement yielding O- and C-benzylated products.The p-nitrobenzyl compound reacts by a chain radicaloid mechanism and gives high yields of C-p-nitrobenzylated diketones.The parent benzyl compound forms some C- and some O-benzylated products, together with bibenzyl, probably by a radical chain reaction which was suppressed by radical traps.
- Marquet, Jorge,Moreno-Manas, Marcial,Pacheco, Pedro,Prat, Maria,Katritzky, Alan R.,Brycki, Bogumil
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p. 5333 - 5346
(2007/10/02)
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- CHEMIOSELECTIVITY IN THE PRESENCE OF SURFACTANTS. I. C- vs. O-ALKYLATION IN β-DICARBONYL COMPOUNDS
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A number of β-dicarbonyl compounds (2,4-pentanedione, 5,5-dimethyl-1,3-cyclohexanedione, 1,3-cyclopentanedione, ethyl 3-oxobutanoate, and diethyl propanedioate) reacted with benzyl bromide in basic aqueous solutions of hexadecyltrimethylammonium bromide at room temperature.The presence of the cationic surfactant directed the reaction toward the carbon nucleophilic site, with high chemioselectivity.C-Dialkylated species were generally predominant, due to the increased lipophilicity of the monoalkylated species, with respect to the reagent.No hydrolysis of benzyl bromide was observed in the presence of the surfactant.
- Bassetti, Mauro,Cerichelli, Giorgio,Floris, Barbara
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p. 583 - 586
(2007/10/02)
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- ALKYLATION OF β-DIKETONES THROUGH THEIR Co(II), Co(III) AND Zn(II) COMPLEXES. 1-BROMOADAMANTANE AS ALKYLATING AGENT.
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α-(1-Adamantyl)-β-diketones are now accessible by the alkylation of Co(II) complexes of β-diketones with 1-bromoadamantane.The intermediacy of adamantyl cation is proposed.Co(II), Co(III) and Zn(II) complexes of pentane-2,4-dione react with alkyl halides precursors of stabilized carbenium ions, to give 3-alkylpentane-2,4-diones.
- Gonzalez, A.,Gueell, F.,Marquet, J.,Moreno-Manas, M.
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p. 3735 - 3738
(2007/10/02)
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