- Nickel Hydride Catalyzed Cleavage of Allyl Ethers Induced by Isomerization
-
This report discloses the deallylation of O - and N -allyl functional groups by using a combination of a Ni-H precatalyst and excess Bronsted acid. Key steps are the isomerization of the O - or N -allyl group through Ni-catalyzed double-bond migration followed by Bronsted acid induced O/N-C bond hydrolysis. A variety of functional groups are tolerated in this protocol, highlighting its synthetic value.
- Kathe, Prasad M.,Berkefeld, Andreas,Fleischer, Ivana
-
supporting information
p. 1629 - 1632
(2021/02/09)
-
- Method for preparing 4-hydroxy-4'-isopropoxydiphenyl sulfone from 4,4'-diisopropoxydiphenyl sulfone
-
The invention relates to a method for preparing 4-hydroxy-4'-isopropoxydiphenyl sulfone from 4,4'-diisopropoxydiphenyl sulfone. The method comprises the following steps: under the action of a phase transfer catalyst, subjecting 4,4'-diisopropoxy diphenyl sulfone to an alkaline hydrolysis reaction in a solvent in the presence of an alkaline substance, wherein a reaction temperature is 110-160 DEG Cand reaction time is 2-6 hours; and subjecting a reaction product to aftertreatment acidification to obtain 4-hydroxy-4'-isopropoxydiphenyl sulfone. According to the method disclosed by the invention, relatively high yield of the 4-hydroxy-4'-isopropoxydiphenyl sulfone can be realized, so problems in the recycling of the byproduct 4,4'-diisopropoxydiphenyl sulfone are solved.
- -
-
Paragraph 0015-0020
(2020/05/01)
-
- COLOR DEVELOPING COMPOSITION CONTAINING MOLECULAR COMPOUND, AND RECORDING MATERIAL
-
Provided is a color-developing composition containing a molecular compound which has as a component compound a compound represented by formula (I) [wherein Y represents a C1-C12 hydrocarbon group which is chained or branched and saturated or unsaturated, or a C1-C8 hydrocarbon group which is chained or branched, saturated or unsaturated and has an ether or thioether bond; R1, R2, R3 and R4 each independently represent a C1-C6 alkyl group or C2-C6 alkenyl group; n, p, q and r each represents any integer of 0 to 4; and m represents any integer of 0 to 2]. Also provided is a recording material with a sufficient color-forming sensitivity, superior storage stability, and especially with an extremely little background fogging in a heat resistance test.
- -
-
-
- Occurrence and estrogenicity of phenolics in paper-recycling process water: Pollutants originating from thermal paper in waste paper
-
Eight phenolics were detected in samples collected from areas where paper-recycling process water is discharged. The detected concentration levels were up to 270 μg/L and 230 μg/g in water samples and sediment samples, respectively, obtained from both the outfall of the paper-recycling process water and its downstream areas. In particular, totarol (compound 4), 2,4-bis(1-phenylethyl)phenol (compound 6), 4,4′-butylidenebis(6-t-butyl-m- cresol) (compound 7), 2,4-bis(1-phenylethyl)-6-chlorophenol (compound 8), and 4-hydroxy-4′-isopropoxydiphenyl sulfone (compound 9) were identified for the first time as environmental pollutants. The estrogenicities of the identified compounds were assessed by yeast two-hybrid assays incorporating either the human or medaka fish (Oryzias latipes) estrogen receptor α (hERα and medERα, respectively) and an estrogen receptor competitive enzyme-linked immunosorbent assay (ER-ELISA) both with and without metabolic activation by a rat liver S9 mix. Bisphenol A (compound 3) and 2-naphthol (compound 1) exhibited activity in the assays of both hERα and medERα without the S9 mix. The relative activity (%) to 17β-estradiol was 0.0015% for compound 3 and 0.0009% for compound 1 in the hERα assay and 0.027% for compound 3 and 0.0093% for compound 1 in the medERα assay. These compounds were attenuated by the S9 mix. The binding affinity was evaluated using an ER-ELISA. Compounds 3, 4, 6, and 7 exhibited affinity without the S9 mix. After exposure to the S9 mix, however, the binding affinity of compound 7 was eliminated by the S9 mix; those of compounds 3, 4, and 6 were attenuated; and that of compound 8 exhibited affinity. A comprehensive assessment of the estrogenicities of the phenolics originating from thermal paper and their implications for an aquatic environment may require an examination of the components of the phenolics, as in the present study.
- Terasaki, Masanori,Shiraishi, Fujio,Fukazawa, Hitoshi,Makino, Masakazu
-
p. 2356 - 2366
(2008/03/14)
-
- Industrial process for the production of diphenyl sulfone compounds
-
A process for producing 4-isopropoxy-4′-hydroxydiphenyl sulfone useful as the developer for leuco dyes to be used in thermosensible papers, which is excellent in productivity, economical efficiency and safety and permits the production of the compounds from constantly available raw materials. This process is improved in productivity and economical efficiency as compared with those of the prior art both by shortening the production time by the use of an isopropyl iodide, which is more reactive than isopropyl bromide which have been used in the prior art.
- -
-
-
- Thermosensitive recording material and color developer compound therefor
-
A thermosensitive recording material has a support and a thermosensitive coloring layer formed thereon containing a leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of heat thereto, with the color developer including at least one compound (A) having in a molecule thereof at least two aromatic ring moieties with specific structures, selected from the group consisting of an aromatic ring moiety having at least one carboxyl group and electron-attracting functional group, an aromatic ring moiety having at least one carboxyl group and electron-donating functional group, and an aromatic ring moiety having at least one carboxyl group, free of the electron-attracting and electron-donating functional groups. An aromatic carboxylic acid compound serving as the above-mentioned compound (A) and the producing method thereof are also disclosed.
- -
-
-
- Industrial process for the production of diphenyl sulfone compounds
-
A process for producing compounds of general formula (II) useful as the developer for leuco dyes to be used in thermosensible papers, which is excellent in productivity, economical efficiency and safety and permits the production of the compounds from constantly available raw materials. This process is improved in productivity, economical efficiency and safety as compared with those of the prior art both by shortening the production time by the use of, e.g., an alkyl iodide, RI, which is more reactive than alkyl bromides which have been used in the prior art, and by attaining the complete recovery and reuse of iodine by incorporating into the process the iodine recovery step of recovering iodine from the manufacturing wastewater and reacting this iodine with an alcohol to thereby self-produce an alkyl iodide.
- -
-
-
- Process for producing diphenyl sulfone compound
-
The present invention is to provide methods for producing highly pure 4,4′-dihydroxydiphenyl sulfone monoethers advantageously in industrial production. In a process for producing a compound represented by Formula (I) (wherein, R1 and R2
- -
-
-
- Salicylic acid derivatives
-
The heat-sensitive recording material disclosed comprises a colorless or pale colored dyestuff precursor, one or more salicylic acid derivative of the formula (1) or metal salt of the derivative and an aliphatic amide compound having 18?60 carbon atoms in molecular structure, and is excellent in thermal response and preservation stability of white portions and images. STR1 wherein X1 and X2 are a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aralkyl group or an aryl group, Y1 and Y2 are an oxygen atom or a sulfur atom, R1 is a hydrogen atom, an alkyl group, an aralkyl group or an aryl group, and R2 is an alkyl group, an alkenyl group, an aralkyl group or an aryl group.
- -
-
-
- Phenolic compounds
-
A phenolic compound having formula (I): STR1 wherein X represents a chlorine atom or a methyl group, and a recording material comprising a coloress or light-colored leuco dye and the above phenolic compound serving as a color developer for the leuco dye are disclosed.
- -
-
-
- 4-Hydroxy-4'-isopropoxydiphenylsulfone and its use for color-developable recording material
-
4-Hydroxy-4'-isopropoxydiphenylsulfone useful as color developer for heat-sensitive color-developable recording material.
- -
-
-
