A new diamine, 1,1-bis[4-(4-aminophenoxy)phenyl] cyclododecane (BAPCD), bearing flexible ether and bulky pendant cyclododecylidene groups was prepared in three steps from cyclododecanone. The monomer was reacted with six conventional aromatic dianhydrides in N,N-dimethylacetamide (DMAc) to obtai...
The paper describes the synthesis and characterization of sulfonated polyimides based on 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTDA), 4,4′-diaminodiphenylether-2,2′-disulfonic acid (ODADS) and (bis[4-(4-aminophenoxy)phenylhexafluoropropane] (BDAF)). Several copolymer samples were pr...
Copolyimides based on 4,4′-bis(3-aminophenoxy)biphenyl (abbreviated to BAB) and pyromellitic dianhydride (PMDA) were synthesised with 4,4′-oxydianiline (4,4′-ODA) and/or 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA). Basic property and melt processability of synthesised copolyimides...
A series of benzimidazole-groups-containing copolyimides (PIs) have been synthesized by random condensation copolymerization of 4,4′-(biphenyl-4,4′-diyldi(oxo))bis(1,8-naphthalic anhydride) (BPNDA), 1,3-bis(4-aminophenoxy)benzene (BAPBz), and 2-(4-Aminophenyl)-5-aminobenzimidazole (APABI) in m...
In this work, we synthesised a new diamine containing noncoplanar 2,2′-dimethyl-biphenylene and flexible aryl ether units, 2,2′-dimethyl-4,4′-bis(4-aminophenoxy)biphenyl (DBAPB), by nucleophilic substitution of 2,2′-dimethylbiphenyl-4,4′-diol with p-chloronitrobenzene in the presence of K2C...
A novel sulfonated diamine monomer, 4,4′-bis(4-aminophenoxy)biphenyl-3,3′-disulfonic acid (BAPBDS) with the high basisity and flexible structure was synthesized by direct sulfonation of 4,4′-bis(4-aminophenoxy)biphenyl (BAPB). Sulfonated polyimides (SPIs) were prepared from 1,4,5,8-naphthalen...
Novel diamine monomer 4,4′-bis((4-aminophenoxy)methyl)-1,1′-biphenyl (B4AP) was synthesized from precursor dinitro compound 4,4′-bis((4-nitrophenoxy)methyl)-1,1′-biphenyl (B4NP). A new series of polyimides was developed by condensation of B4AP with three dianhydrides (BTDA, ODPA, 6FDA). 4,4ʹ...
Human skeletal muscle homogenates were found to contain an esterase that catalyzes the hydrolysis at neutral pH of acetyl-dl-phenylalanine β-naphthyl ester, a known low molecular weight substrate for chymotrypsin-like enzymes. The muscle enzyme was inhibited by phenylmethyl sulfonyl fluoride bu...
In this study, several sulfonamide derivatives, 4-(2-methylacetylamino)benzenesulfonamides were synthesized. Chemical structures of the derivatives were characterized by 1H NMR, 13C NMR, LC–MS–MS, UV–Vis, FTIR, photoluminescence and elemental analysis. Sulfanilamide was reacted with 2-bromopr...
Oxidative Nef reaction of 2-nitroalkanamines or N-(2-nitroalkyl)carboxamides bearing trifluoromethyl group affords amino acids, amino ketones or hydroxyhydantoins depending on structure of the starting compounds.
α-Lipoic acid derivatives were synthesized and evaluated for their in vitro anticancer activities against NCI-460, HO-8910, KB, BEL-7402, and PC-3 cell lines. The results, for most compounds exhibited dose-dependent inhibitory property and several compounds had good inhibitions at the dose of 1...
A novel three-dimensional metal-organic framework (MOF) {[In3(NIPH)3 (HNIPH)(OH)2]·4H2O}n (1) (H2NIPH = 5-nitroisophthalic acid) with one-dimensional channels was synthesized and structurally characterized. Importantly, it demonstrates excellent catalytic activity for the Strecker reactions of ...
PhSCF2CF2Br in the presence of tributyltin hydride and substochiometric triethylborane in dichloromethane underwent radical addition to alkenes to give the bromine-free products. Reductive substitution of the phenylsulfanyl group for hydrogen in these adducts provided compounds with the tetraflu...
The title compound has been prepared in 96–98% yield by the reaction of tetrafluoroethylene and dimethylamine. 1,1,2,2-Tetrafluoroethyl-N,N-dimethylamine (1) is found to be an effective reagent for the conversion of alcohols into alkyl fluorides. Reaction of 1 and primary alcohols proceeds with...
We have made a systematic investigation on the copper(0)-mediated tetrafluoroethylenation of iodobenzene with structurally diverse 2-bromo-1,1,2,2-tetrafluoroethyl compounds. A comparison of this reaction with 1,2,2-trifluoro-1-phenylethylation and the known functionalized difluoroalkylation dem...
PI3K/Akt/mTOR and hedgehog (Hh) signalings are two important pathways in breast cancer, which are usually connected with the drug resistance and cancer migration. Many studies indicated that PI3K/Akt/mTOR inhibitors and Hh inhibitors displayed synergistic effects, and the combination of the two ...
A 1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane (DDT) degrading bacterium strain IITR03 producing trehalolipid was isolated and characterized from a pesticides contaminated soil. The strain IITR03 was identified as a member of the genus Rhodococcus based on polyphasic studies. Under aqueous cult...
Trametes versicolor U97 isolated from nature degraded 73% of the 1,1,1-trichloro-2,2-bis(4-chlorophenyl) ethane (DDT) in a malt extract liquid medium after a 40-d incubation period. This paper presents a kinetic study of microbial growth using the Monod equation. T. versicolor U97 degraded DDT d...
The mid- and far-IR absorption spectra of four substituted toluenes, namely 2-fluoro-5-nitro-, 2-fluoro-4-nitro-, 4-fluoro-2-nitro- and 5-fluoro-2-nitrotoluene were recorded. Vibrational assignments are proposed assuming Cs, symmetry for the molecules.
Exposure of streptomycin-resistant cells to puromycin results in uptake of dihydrostreptomycin comparable to that found with streptomycin-sensitive cells. This finding indicates that the enhanced phase of uptake, previously reported only in sensitive cells, may result from an increase in interna...
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