115609-04-6Relevant academic research and scientific papers
Organic photochromic dyes and their use for dye-sensitized solar cells
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Paragraph 0222-0227; 0318; 0339-0343, (2020/04/21)
The present invention concerns an organic dye comprising a photochromic entity, a segment -eD representing an electron donor segment and a segment -L-A with -L- representing a covalent bond or a spacer segment and particularly a pi-conjugated spacer segme
The structure of the photochromic compounds and its synthetic method
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Paragraph 0110-0111, (2017/02/02)
The invention relates to four photochromic compounds having cyclic structures and a synthesis method of the photochromic compounds. The synthesis method of the four compounds all of which have the cyclic structures comprises the following steps: (1) carry
Bronsted acid-catalyzed cycloisomerization of but-2-yne-1,4-diols with or without 1,3-dicarbonyl compounds to tri- and tetrasubstituted furans
Mothe, Srinivasa Reddy,Lauw, Sherman Jun Liang,Kothandaraman, Prasath,Chan, Philip Wai Hong
experimental part, p. 6937 - 6947 (2012/10/07)
A Bronsted acid-catalyzed method to prepare tri- and tetrasubstituted furans efficiently from cycloisomerization of but-2-yne-1,4-diols with or without 1,3-dicarbonyl compounds is described. By taking advantage of the orthogonal modes of reactivity of the alcoholic substrate through slight modification of the reaction conditions, a divergence in product selectivity was observed. At room temperature, p-TsOH?H 2O-mediated tandem alkylation/cycloisomerization of the propargylic 1,4-diol with the β-dicarbonyl compound was found to selectively occur to provide the tetrasubstituted furan product. On the other hand, increasing the reaction temperature to 80 °C was discovered to result in preferential p-TsOH?H2O-catalyzed dehydrative rearrangement of the unsaturated alcohol and formation of the 2,3,5-trisubstituted furan adduct.
The synthesis and properties of vinyl substituted naphthopyrans and their styrene copolymers
Blackwell, Catherine J.,Gabbutt, Christopher D.,Guthrie, James T.,Heron, B. Mark
, p. 408 - 420 (2012/08/28)
A comprehensive series of mono-, di- and tri-bromo-3H-naphtho[2,1-b]pyrans was synthesised by the traditional union of a 2-naphthol with an alkynol. The bromine atom(s) in these naphthopyrans was readily replaced by a vinyl group using a Suzuki coupling reaction with vinyl boronic anhydride pyridine complex. The efficiency of the Suzuki vinylation reaction decreases with the increasing number of bromine atoms to be substituted. The vinylnaphthopyrans served as styrene analogues and readily underwent a thermally initiated free radical addition co-polymerisation with styrene to efficiently afford low molecular weight poly(styrene-co-naphthopyrans). The photochromic response of the bromonaphthopyrans and vinylnaphthopyrans followed the established colour-structure relationships for photochromic naphthopyrans. The photochromic response of toluene solutions of the poly(styrene-co-naphthopyrans) was characterised by a hypsochromic shift of the λmax relative to that recorded for the vinylnaphthopyran monomers. Increased half-lives were noted for the copolymers derived from the bis- and tris-vinylnaphthopyrans where some degree of crosslinking was expected. A further hypsochromic shift in λmax resulted for the thin films of the poly(styrene-co- naphthopyrans). Of particular note was the behaviour of the 3-(2-vinylphenyl)-3- phenylnaphthopyran which gave the typical yellow colour of the photomerocyanine coupled with the predictable large half-life. However, all photochromism of this naphthopyran was lost upon polymerisation suggesting that an alternative pathway supervenes in the expected polymerisation sequence.
Alpha-ethynyl benzohydrols
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, (2008/06/13)
The invention is a new process for the preparation of α-ethynyl-benzohydrols and of ring-substituted derivatives thereof by reacting the starting benzophenone or a ring-substituted derivative thereof with acetylene in a solvent delivering no protons, in t
