This paper endeavors to answer an important question posed during the fabrication of vapor sensors based on multiwall carbon nanotubes (MWCNTs): How do the preparation and measurement conditions influence the sensor response in real-life situations? A satisfactory answer could be given in view of the effects produced by the surface functionalization of MWCNTs and various solvent vapors. To this end, this case study was designed upon modified-MWCNT-networks (Ns) with alkyl diol (EG) and alkyl diamine (EDA, HDA) treatments, and the sensor responses of these networks were examined in respect of the following vapors: water and different solvents from the groups of paraffinic hydrocarbon, aromatic hydrocarbon, halohydrocarbon, ether, ketone, aldehyde, ester, and nitrogen containing compounds, sulphur containing compounds, alcohols and acids. In addition, an applied sensor based on MWCNT (HDA)-N was evaluated by measuring various alcoholic beverages and vinegar.

Background: 4-Hydroxyquinolin-2-ones and quinoline-2,4-diones, a subset of the quinolone scaffold, have attracted attention due to their biological properties. These structures are present in many classes of natural products and pharmaceutical agents and show promise in antiviral and antibacterial treatment. They possess anticonvulsive effects, selective affinity to cannabinoid receptors, and other interesting biological activity. Some of these compounds have the potential for protection and properties modification of natural as well as synthetic materials as antioxidants, antidegradants, antifungal agents, UV absorbers, optical brighteners, luminophores, etc. Objective: The importance of these compounds stimulated the development of innovative conventional and modern catalytic methods for their preparation. The present review highlights recent progress in the above subjects.

An unprecedented reactivity of 3-aminoquinoline-2,4-diones is reported. Under basic conditions, these compounds undergo molecular rearrangement to furnish 1,4-benzodiazepine-2,5-diones. The transformations take place under mild reaction conditions by using 1,1,3,3-tetramethylguanidine, NaOEt, or benzyltrimethylammonium hydroxide as a base. A proposed mechanism of the rearrangement and the conformational equilibrium of 1,4-benzodiazepine-2,5-dione rings are discussed.

ChemInformVolume 45, Issue 22 Isocyclic Compounds ChemInform Abstract: Oxidative Ring Opening of 3-Hydroxyquinoline-2,4(1H,3H)-diones into N-(α-Ketoacyl)anthranilic Acids. Stanislav Kafka, Stanislav Kafka Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorKarel Proisl, Karel Proisl Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorVera Kasparkova, Vera Kasparkova Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorDamijana Urankar, Damijana Urankar Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorRoman Kimmel, Roman Kimmel Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorJanez Kosmrlj, Janez Kosmrlj Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this author Stanislav Kafka, Stanislav Kafka Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorKarel Proisl, Karel Proisl Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorVera Kasparkova, Vera Kasparkova Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorDamijana Urankar, Damijana Urankar Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorRoman Kimmel, Roman Kimmel Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this authorJanez Kosmrlj, Janez Kosmrlj Dep. Chem., Fac. Technol., Tomas Bata Univ., CZ-762 72 Zlin, Czech RepublicSearch for more papers by this author First published: 15 May 2014 https://doi.org/10.1002/chin.201422084Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume45, Issue22June 3, 2014 RelatedInformation

N-(α-ketoacyl)anthranilic acids reacted with phenylhydrazinium chloride in boiling acetic acid to afford 2-(indol-2-carboxamido)benzoic acids in good to excellent yields and 2-indolyl-3,1-benzoxazin-4-ones as by-products. The formation of the latter products could easily be suppressed by a hydrolytic workup. Alternatively, by increasing the reaction temperature and/or time, 2-indolyl-3,1-benzoxazin-4-ones can be obtained exclusively. Optimisations of the reaction conditions as well as the scope and the course of the transformations were investigated. The products were characterized by (1)H, (13)C and (15)N NMR spectroscopy. The corresponding resonances were assigned on the basis of the standard 1D and gradient selected 2D NMR experiments ((1)H-(1)H gs-COSY, (1)H-(13)C gs-HSQC, (1)H-(13)C gs-HMBC) with (1)H-(15)N gs-HMBC as a practical tool to determine (15)N NMR chemical shifts at the natural abundance level of (15)N isotope.

In the title compound, C(16)H(13)NO(2), the quinoline system is approximately planar with a maximum deviation from the least-squares plane of 0.059 (1) Å for the N atom. The phenyl ring is rotated by 62.16 (4)° with respect to the plane of the quinoline system. In the crystal, O-H⋯O hydrogen bonds link mol-ecules into infinite chains running along the b-axis direction.

N-(α-Ketoacyl)anthranilic acids were prepared by oxidative ring opening of 3-hydroxyquinoline-2,4(1H,3H)-diones by using paraperiodic acid (H5IO6) or sodium periodate (NaIO4). The optimisation of the reaction conditions is described as well as the utilisation of N-(α-ketoacyl)anthranilic acids in the preparation of anthranilic acid hydrochlorides.

In the title compound, C12H13NO3, the quinoline ring system is approximately planar with a maximum deviation from the least-squares plane of 0.058 (2) angstrom. In the crystal, N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds link the molecules into chains running along the b-axis direction. The chains also feature pi-pi interactions between pyridine and benzene rings of inversionrelated molecules [ centroid-centroid distance = 3.609 (2) angstrom].

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

In the title hydrate, C12H13NO4 center dot H2O, the piperidine ring that is fused to the benzene ring is in a sofa conformation with the chiral C atom lying 0.4084 (18) angstrom out of the plane of the nine fused-ring atoms. In the crystal, O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds link the organic molecules and water molecules into chains running along the b-axis direction. The chains are further connected into layers parallel to the bc plane by pi-pi interactions between inversion-related benzene rings [centroid-centroid distance = 3.8846 (9)].