Showing papers on "Fluorenone published in 1983"
TL;DR: In this article, the title silaalkenes react with cyclopentadienones to give the stable 1,2-silaoxetanes, and the silaoxetane of fluorenone, benzophenone, and α-pyrones undergo rearrangement and cleavage reactions.
22 citations
21 citations
TL;DR: In this paper, the authors showed that the reaction is very likely radical in character; preliminary studies show that the rate is dependent on both the catalyst and acceptor concentrations, and that it is possible to form anthracene and fluorenone in the process.
7 citations
TL;DR: The electrogenerated anions −CH2CN induce the conversion of the various reduction-acylation products of fluorenone 1a and its anil 1b in acetonitrile into 1α and 1b; this phenomenon is controlled b... as mentioned in this paper.
Abstract: The electrogenerated anions −CH2CN induce the conversion of the various reduction–acylation products of fluorenone 1a and its anil 1b in acetonitrile into 1a and 1b; this phenomenon is controlled b...
5 citations
4 citations
TL;DR: In this article, the spin density transfer from the anion to the magnetic nuclei of the cation has been interpreted on the basis of spin density transferred from an ion to the magnetized nuclei, and the implications to phase transfer catalysis are discussed.
3 citations
TL;DR: In this article, the surfaces of silica gel and of Aerosil have been chemically modified with γ-(dimethylaminopropyl) methyldiethoxysilane and (diethylaminomethyl)triethoxysinane, and the influence of reaction time, fluorenone concentration, solvent polarity and chemical nature of the aromatic ketone on the yields of grafted polymer and of homopolymer was studied.
Abstract: The surfaces of silica gel and of Aerosil have been chemically modified with γ-(dimethylaminopropyl) methyldiethoxysilane and (diethylaminomethyl)triethoxysilane. Preliminary activation of silica by silanes permitted achievement of graft polymerization of methyl methacrylate and styrene in the presence of fluorenone, anthraquinone, benzophenone and benzoin methylether, under the action of visible light. The influence of reaction time, fluorenone concentration, solvent polarity and chemical nature of the aromatic ketone on the yields of grafted polymer and of homopolymer, together with the molecular weights of the grafted chains, was studied.
2 citations
TL;DR: When CH2CN anions are electrogenerated in acetonitrile addition occurs to fluoren-9-one (FICO) or fluorenone and succinonitrile have failed as discussed by the authors.
Abstract: When –CH2CN anions are electrogenerated in acetonitrile addition occurs to fluoren-9-one (FICO) or fluoren-9-ylideneacetonitrile (FICCHCN) to give the condensation of fluorenone and succinonitrile have failed.
2 citations
TL;DR: The free ion of fluorenone radical anion (FlO) was formed even in tetrahydrofuran (THF) by the flash photolysis of the alkali-metal salts of the sulfonyl carbanion in the presence of neutral FlO as mentioned in this paper.
Abstract: The free ion of fluorenone radical anion (FlO) was formed even in tetrahydrofuran (THF) by the flash photolysis of the alkali-metal salts of the sulfonyl carbanion in the presence of neutral FlO and this was attributed to the ion pair structure of the sulfonyl carbanions.
2 citations
TL;DR: Fluorenyl ethers formed in the reaction of singlet fluorenylidene with alcohols undergo photocleavage to give fluorene and fluorenone, which formally arise from triplet fluorenYLidene as mentioned in this paper.
Abstract: Fluorenyl ethers formed in the reaction of singlet fluorenylidene with alcohols undergo photocleavage to give fluorene and fluorenone, which formally arise from triplet fluorenylidene.
2 citations
TL;DR: Usmani et al. as mentioned in this paper synthesized acetylene terminated fluorenone (ATF), which is a bifunctional monomer of bisphenol A. The reaction was carried out under an inert atmosphere at 130°C for 4 days.
Abstract: In prior work [1, 2] we have described properties of fluorenone polyesters and preparation of mouldings, films, and fibres, therefrom. Fluorenone polyesters are made from isophthalic acid or terephthalic acid/isophthalic acid and bisphenol fluorenone and they have many outstanding characteristics, especially heat resistance. A wide range of polyesters can be made by varying the ratio of acids (terephthalic and isophthalic) and biLsphenols (bisphenol fluorenone and bisphenol A) and by regulating the molecular weight. Fluorenone polyesters rich in bisphenol A content will have good mouldability, whereas polyesters containing large amounts of bisphenol fluorenone have marginal mouldability. An acetylene terminated bifunctional monomer of fluorenone can plasticize fluorenone polyesters at moderately elevated temperatures and can react at high temperatures to form an improved thermally stable crosslinked network. Over the past several years, Arnold and coworkers have synthesized a family of new polymers derived from acetylene terminated monomers, e.g. acetylene terminated sulfones (ATS)and acetylene terminated quinoxalene (ATQ) [3, 4]. These are known to exhibit high thermal stability, good adhesion characteristics, and high moisture resistance. Usmani and co-workers believe that the prospects of acetylene terminated polymers are good in the future [5]. This being the case, we synthesized acetylene terminated fluorenone (ATF). ATF was prepared by the reaction route shown at the top of the next column, p-fluorophenyl acetylene (6.00 g) was added to 9,9-bis(4-hydroxyphenyl)fluorene (8.50g) in dimethylsulfoxide (230 ml) containing 25.8 g of potassium carbonate. The reaction was carried out under an inert atmosphere at 130°C for 4 days. The progress of the reaction was followed by infrared spectroscopy (monitoring acetylene band at 3300cm-1). The