A neutron diffraction study of squaric acid (C/sub 4/H/sub 2/O/sub 4/; 3,4-dihydroxy-3-cyclobutene-1,2-dione) at 25degreeC has been carried out. Space group P2/sub 1//m, a=6.143(2), b=5.286(2), c=6.148(2) A, ..beta..=89.96(2) degree, Z=2. The structure has been...
ChemInform Abstract: The Crystal and Molecular Structure of Semisquaric Acid (3‐Hydroxy‐3‐cyclobutene‐1,2‐dione)other bioactive productsNo abstract is available for this article.doi:10.1002/chin.198823349SEMMINGSEN, D.GROTH, P.Wiley-BlackwellCheminform...
ChemInform Abstract: Reactions of Squaric Acid with Phenylhydrazine: Structure and NMR Spectroscopy of Cyclobutanetetraone Poly(phenylhydrazones)cyclobutane derivativeshydrazines (benzene compounds)pyrazine derivativesChemInform is a weekly Abstracting Service, delivering concise information at a glance that was ...
These cations can be synthesized by the reaction of benzothiazolium iodides and squaric acid in the ratio 3:2 without the addition of a base. The chromophore of 1 is a polymethine chromophore and not a triarylmethane one. R = Bu, Pr, Et.关键词:...
Squaric Acid N-Hydroxylamides: Synthesis, Structure, and Properties of Vinylogous Hydroxamic Acid Analogues. The synthesis of squaric acid N-hydroxylamide esters 5 and amides 6 from dimethyl squarate 2a is described. These derivatives are analogues of the naturall... Lim,C Nathaniel,Morton,... ...
2024, Journal of Molecular Structure Citation Excerpt : In the literature, hydrogen-bonded molecular complex crystals involving squaric acid and its anions have been extensively investigated, highlighting their significance in diverse supramolecular architectures [12,14–16]. On the other hand, DIPA has...
aclassofnonbenzoidaromatsofplanarmolecular shape.3,4一Dihydroxycyclobut一3一ene一1.2一dionewhich iscommonlycalledsquaricacid(H2C404) was preparedforthefirsttimein1959[1].Seitzetal_[2】 firstly preparedthe respective tetrathio analogue, 3一cyclobutene-1,2一dithione-3,4一dithiolate,commonly ...
These values are consistent with those reported from 17O-NMR studies21 for Brønsted acid sites of 6.6 MHz and in line with computed values reported in Supplementary Tables 6 and 7. The contribution from the different species were properly weighted in the simulation in order to better fit...
Synthesis, Hirshfeld surface analysis, DFT calculations, photoluminescence, spectroscopic and second order non linear optical studies on ammonium hydrogensquarate squaric acid monohydrate crystal T. Kalaiarasi, M. Senthilkumar Article 128905 select article 2-Amino-3-methylpyridinium, 2-amino-4-methylbenzoth...
关键词: carbon suboxide collisional experiments ionization energies squaric acid oxalyl dichloride DOI: 10.1002/(SICI)1096-9888(199602)31:23.0.CO;2-1 年份: 1996 收藏 引用 批量引用 报错 分享 全部来源 求助全文 Wiley 相似文献 参考文献[C2O2]+· ions of unusual structure The structure of the C2O2...