Showing papers on "Alicyclic compound published in 2017"

Random Copolycarbonates Based on a Renewable Bicyclic Diol Derived from Citric Acid

Abstract: To address the poor thermal stability of isohexides while at the same time retain rigidity, we developed a novel bicyclic diol octahydro-2,5-pentalenediol (OPD) from naturally occurring citric acid in this study. Owing to the bicyclic skeleton composed of two fused cyclopentane rings, OPD is supposed to have perfect rigidity but higher thermal stability compared to isohexides. Herein, OPD was first converted to octahydro-2,5-pentalenediol bis(methyl carbonate) (OPBMC) by reacting with dimethyl carbonate. The absolute stereochemistry of OPBMC was investigated by 2D 1H NMR and 13C NMR as well as single crystal X-ray diffraction. By polymerization of OPBMC with several aliphatic diols [1,8-octanediol (A8), 1,10-decanediol (A10), and 1,12-dodeacnediol (A12)] and alicyclic diols [1,4-cyclohexanedimethanol (CHDM), 1,2,2-trimethylcyclopentane-1,3-dimethanol (TCDM), and octahydro-2,5-pentalenediol (OPD)], a series of bio-based copolycarbonates (co-PCs) with intriguing properties were synthesized. NMR spectra reve...

Iterative direct C(sp3)–H functionalization of amines: diastereoselective divergent syntheses of α,α′-disubstituted alicyclic amines

Abstract: A novel iterative C(sp3)-H oxygenation/C-C bond formation strategy, which avoids repetitive N-protection/-deprotection steps, was developed for direct α,α'-difunctionalization of alicyclic amines. The method is highly efficient and stereoselective in producing syn-α,α'-disubstituted aliphatic N-heterocycles. Synthetic potential and practicability of the method was demonstrated by an easy and straightforward synthesis of neuroactive alkaloid nor-lobelane and its derivatives.

Experimental and theoretical studies on extraction of actinides and lanthanides by alicyclic H-phosphonates

Abstract: Abstract Three different alicyclic substituents H-phosphonates, namely, dicyclopentyl H-phosphonate, dicyclohexyl H-phosphonate and dimenthyl H-phosphonate were synthesized and used for liquid–liquid extraction of actinide elements (U, Am and Th) and lanthanide (Gd) in n-dodecane from nitric acid medium. The physicochemical properties of the extractants, such as density, viscosity, solubility were determined. At lower acidities, these H-phosphonates exhibit higher distribution values and the extraction following cation exchange mechanism through P–OH group of tri-coordinated phosphite form. At higher acidities (2N), the extraction is primarily via solvation mechanism through P=O group of penta-coordinated phosphonate form. Amongst the three H-phosphonates, examined dimenthyl H-phosphonate showed the best results for the actinide extraction. Density functional theory (DFT) calculations were applied to understand the electronic structure of the ligands and the metal complexes. The calculated large complexation energy of UO2(NO3)2·2DMnHP is in agreement with the observed trend in experimental distribution ratio data.

Fluorination of some highly functionalized cycloalkanes: chemoselectivity and substrate dependence.

Abstract: A study exploring the chemical behavior of some dihydroxylated β-amino ester stereo- and regioisomers, derived from unsaturated cyclic β-amino acids is described. The nucleophilic fluorinations involving hydroxy–fluorine exchange of some highly functionalized alicyclic diol derivatives have been carried out in view of selective fluorination, investigating substrate dependence, neighboring group assistance and chemodifferentiation.

Polyimide resin, polyimide resin composition, touch panel using same, method for producing said touch panel, color filter, method for producing color filter, liquid crystal element, method for producing liquid crystal element, organic el element, and method for producing organic el element

Abstract: Provided is a polyimide resin which is mainly composed of a structural unit of formula 1, while containing a structural unit of formula 2 in an amount of 2-30 mol% of the total structural units, and which has excellent light transmission properties, low birefringence, low linear thermal expansion properties, and laser releasability. In the formulae, R1 represents a group having 4-40 carbon atoms (a monocyclic/condensed polycyclic alicyclic group or a group wherein monocyclic/alicyclic groups are linked to each other directly or via a crosslinked structure); R2 represents a group of formula 3; R3 represents a group of formula 4 or a group of formula 5; each of R4-R11 represents a hydrogen atom, a halogen atom, a halogen-substituted group having 1-3 carbon atoms; and X1 represents a bond, an oxygen atom, a sulfur atom, a sulfonyl group, a halogen-substituted group having 1-3 carbon atoms, an ester bond, an amide bond or a sulfide bond.

4-(Nitroalkyl- and dinitroalkyl-ONN-azoxy)-3-cyanofuroxans and some of their derivatives

Abstract: Dibromoisocyanurate-mediated reaction of 4-amino-3-cyanofuroxans with pseudonitroles of aliphatic, alicyclic, and heterocyclic series (including pseudonitroles bearing ethylcarboxyl or additional nitro group) resulted in 4-(nitroalkyl- and dinitroalkyl-ONN-azoxy)-3-cyanofuroxans. Subsequent chemical transformations gave 4-(1,3-dinitrooxy-2-nitropropyl-2-ONN-azoxy)-3-cyano- and 4-carbamoylfuroxans, as well as 4-(1,1-dinitroethyl-ONN-azoxy)-3-(1H-tetrazol-5-yl)furoxans.

Liquid crystal aligning agent, liquid crystal alignment film, liquid crystal element, polymer and compound

Abstract: PROBLEM TO BE SOLVED: To provide a liquid crystal aligning agent having good storage stability and capable of giving a liquid crystal element that less likely induces an afterimage.SOLUTION: The liquid crystal aligning agent comprises the following (A) component. The (A) component is a polymer having a partial structure represented by formula (1) below, excluding a partial structure represented by formula (1) formed by polymerization condensation of a tetracarboxylic acid derivative and a diamine compound. (In the formula, Arepresents an aromatic ring or an alicyclic ring; Rand Rrepresent a hydrogen atom, a monovalent hydrocarbon group having 1 to 8 carbon atoms, or a protective group; where -COORand -CONRare bonded respectively to two adjoining carbon atoms in the atoms constituting the ring part of A; Rrepresents a substituent having 1 to 6 carbon atoms, which may be bonded to another group to form a ring; and m represents an integer of 0 to 3.)SELECTED DRAWING: None

Thermosetting resin composition

Abstract: A thermosetting resin composition which produces no free isocyanate even when a carbodiimide compound is used and provides a cured resin having high heat resistance. The thermosetting resin composition makes it possible to reduce the curing temperature, cures in a short time and provides a cured rein having a high glass transition temperature. The thermosetting resin composition comprises: (A) an epoxy resin (component A); and (B) a cyclic carbodiimide compound (component B) including a cyclic structure having one carbodiimide group and represented by the following formula (B-i) in which first nitrogen and second nitrogen are bonded together by a bond group and having 8 to 50 atoms forming the cyclic structure: (wherein Q is bivalent to tetravalent bond group which is an aliphatic group, alicyclic group, aromatic group, or a combination of these groups and may contain a hetero atom or substituent); and/or (b) a polyvalent amine-based curing agent (component b) represented by the following formula (b-i): (wherein Ar 1 to Ar 4 are each independently a phenylene group or naphthalene-diyl group which may be substituted by a substituent).

Positive-type resist composition, method for forming resist pattern, photo-reactive quencher, and polymeric compound

Abstract: Z01 to Z04 each independently represent a substituent having electron withdrawing properties, Rb21 and Rb22 each independently represent an alkyl group, an alicyclic hydrocarbon group which may have a substituent, or a hydroxyl group, Rb1 represents an aryl group which may have a substituent, an alkyl group, or an alkenyl group, n1 and n2 represent an integer of 0 to 3, and X0− represents an organic anion.

Polyurethane protective rubber tape

Abstract: The invention relates to a polyurethane protective rubber tape. The polyurethane protective rubber tape sequentially comprises an alicyclic polyurethane elastomer film, a one-component room-temperature vulcanized silicone rubber layer and an anti-sticking stripping film. The thicknesses of the alicyclic polyurethane elastomer film and the one-component room-temperature vulcanized silicone rubber layer are 0.1-0.5mm and 2.0-10.0mm respectively.

Use of a thermoplastic polyester for producing injected parts

Abstract: Use of a thermoplastic polyester for producing injected parts, said polyester having at least one 1,4:3,6-dianhydrohexitol unit (A), at least one alicyclic diol unit (B) other than the 1,4:3,6-dianhydrohexitol units (A), and at least one terephthalic acid unit (C), wherein the molar ratio (A)/[(A)+(B)] is at least 005 and at most 075, said polyester being free of non-cyclic aliphatic diol units or comprising a molar amount of non-cyclic aliphatic diol units, relative to the totality of monomeric units in the polyester, of less than 5%, and with a reduced viscosity in solution (25°C; phenol (50 wt%): ortho-dichlorobenzene (50 wt%); 5 g/L of polyester) greater than 50 mL/g

Thermal Durability Improvement in Transparency of Alicyclic Polyimide by Capping Terminal Amino Groups

Abstract: The alicyclic dianhydride (CpODA) was polycondensated with an aromatic diamine (4,4'-DDE) at room temperature. The poly(amic acid)s gave flexible and tough films by a thermal imidization method in the presence or the absence of acetic anhydride (Ac2O). The resulting polyimide films were absolutely colorless. These polyimide films were reheated in the air at 300 oC and 350 oC for each 0.5 h. The thermal durability in transparency was extremely improved by adding Ac2O and the effect was increased as an increase in the amount of Ac2O. It was tried to prepare colorless alicyclic polyimide films in the air by thermal imidization. Several kinds of acylation reagents were used for end-capping. All the polyimide films prepared by thermal imidization in the air at 350 oC took brown color. However, it is found that two carboxylic anhydrides, Ac2O and TFAA, showed a transparency improvement effect of alicyclic polyimide films even on the thermal imidization in the air.

Cellulose ester aqueous dispersion

Abstract: PROBLEM TO BE SOLVED: To provide a cellulose ester aqueous dispersion excellent in dispersibility and coatability and capable of suppressing tackiness of a dry coating film.SOLUTION: The cellulose ester aqueous dispersion contains a cellulose ester (A) and an anionic polyurethane resin (B). The anionic polyurethane resin (B) contains, as constituents, an active hydrogen group-containing compound (B1) and at least one selected from the group consisting of an aliphatic polyisocyanate (B21) and an alicyclic polyisocyanate (B22).SELECTED DRAWING: None

Application of ice and snow imitating road in training of driving school

Abstract: The invention discloses application of an ice and snow imitating road in training of a driving school. An epoxy category formula of the ice and snow imitating road adopting a construction process of an ice and snow imitating road comprises an undercoat, an intermediate coat, a thin-coated top-coat, wherein the undercoat is prepared from an E51 type epoxy resin, a reactive diluent, deionized water, a substrate wetting agent, a anti-foaming agent and an alicyclic amine curing agent; the intermediate coat is prepared from the E51 type epoxy resin, the reactive diluent, deionized water, an anti-settling agent, an anti-foaming agent, a leveling agent, precipitated barium sulfate, quartz powder and the alicyclic amine curing agent; the top coat is prepared from the E51 type epoxy resin, the reactive diluent, the deionized water, the anti-settling agent, the anti-foaming agent, the leveling agent, a pigment, the precipitated barium sulfate, talcum powder, the quartz powder and the alicyclic amine curing agent. According to the application disclosed by the invention, through the management of the key of the technology in the driving school, by usual training, the performance of wet roads and ice and snow roads is learned, and the driving skills on the wet roads and ice and snow roads are managed, so that the occurrence of vehicle accidents can be completely suppressed, and the ice and snow imitating road can be applied to the technical field of architectural engineering.

Two new crystal structures of two-dimensional lead(II) coordination polymers with flexible alicyclic carboxylate ligands

Abstract: Two new coordination polymers with flexible alicyclic carboxylate ligands, generally formulated as [Pb(chda)]n (1, H2chda = 1,1′-cyclohexanediacetic acid) and [Pb(tmg)]n (2, H2tmg = 3,3′-tetramethyleneglutate), have been successfully synthesized through the liquid–liquid diffusion method. They represent the first main group of metal–organic hybrid compounds assembled from H2chda and H2tmg. Compound 1 crystallized in the non-centrosymmetric space group Pca21, whereas 2 adopts the centrosymmetric P2(1)/c space group. Their structure features one-dimensional infinite chains extended into two-dimensional layer framework. Interestingly, the lead atoms exhibit hemi- as well as holo-directed coordination geometry with coordination number seven in both compounds.

Hard polyurethane resin composition, hard polyurethane resin, molded article, and fiber-reinforced plastic

Abstract: A hard polyurethane resin composition comprises a polyisocyanate component that comprises polyphenylmethane polyisocyanate and an alicyclic polyisocyanate and a polyol component, wherein the ratio of the amount of isocyanate groups derived from the alicyclic polyisocyanate to the total amount of isocyanate groups derived from polyphenylmethane polyisocyanate and the isocyanate groups derived from the alicyclic polyisocyanate in the polyisocyanate component is 10 to 70 mol%.

Conjugated anti-proliferative drug nano-particles and process for preparation thereof

Abstract: A modified bile acid-drug conjugate nanoparticle of formula R-L1-BA-L2-D or pharmaceutically acceptable salts thereof; wherein R is natural, synthetic or modified phospholipid head group,polyethylene glycol or poloxamer class of polyols, or other compatible pharmaceutically acceptable head group; BA is sterol structural class compound, natural and synthetic bile acids and bile salts; D is drug molecules, enzyme/protein inhibitor molecules, imaging ligands, dyes, fluorophores and near-infrared dyes; L1 and L2 represent linkers or spacers and are independently selected from covalent bond, carbon-carbon bond, aromatic, aliphatic, alicyclic, small polymeric linkers including functional groups that covalently conjugate the bile acid moiety and drug or polyethylene glycol moiety or another group.

An Insight into Substrate‐Dependent Fluorination of some Highly Substituted Alicyclic Scaffolds

Abstract: The substrate-dependent fluorination of some highly-functionalized cyclopentane derivatives with multiple chiral centers has been investigated. The key steps of the stereocontrolled syntheses are the oxidative cleavage of the ring carbon–carbon double bond of readily available diexo or diendo norbornene β-amino acid derivatives followed by transformation of the resulted dialdehyde stereoisomers by reduction. Finally, substrate-directable chemodifferentiation of different types of hydroxy groups under fluorination procedures gave various densely functionalized alicyclic derivatives or heterocycles.

Active light sensitive or radiation sensitive resin composition, active light sensitive or radiation sensitive film, pattern forming method, method for manufacturing electronic device, and electronic device

Abstract: This active light sensitive or radiation sensitive resin composition contains a basic compound (A) that is composed of at least one of the basic compounds (A1) and (A2) described below. (A1) A nonionic compound having an alicyclic structure (a1) in each molecule, while having a basic moiety (b2) in a position different from the alicyclic structure. (A2) A nonionic compound having a non-basic heterocyclic structure (a2) in each molecule, while having a basic moiety (b2) in a position different from the heterocyclic structure.

Synthesis of pyrimidinethiones and spiropyrans proceeding from Mannich ketones

Abstract: New synthetic opportunities of conjugated and saturated β-aminoketones were revealed consisting in heterocyclization reactions with the formation of spirochromenes and hydropyrimidinethiones. Alicyclic conjugated Mannich bases under conditions of basic catalysis suffer deamination followed by [4+2]-cycloaddition leading to the stereo- and regiodirected formation of difficultly available spirochromene derivatives. Three-component condensation of acyclic and alicyclic Mannich ketones with thiourea and aromatic aldehydes under aprotic acid catalysis afforded functionalized derivatives of pyrimidine-2-thione series. Optimum conditions were found for О,N-heterocyclization of β-aminocarbonyl substrates.