41106-71-2Relevant academic research and scientific papers
Synthesis, spectroscopic studies and crystal structure of 1,2-bis (4-nitro benzoyloxy) ethane
Khan, Muhammad Saif Ullah,Bolte, Michael,Akhter, Zareen,Siddiqi, Humaira M.
, p. 1180 - 1184 (2011)
The dinitro compound, 1,2-bis (4-nitro benzoyloxy) ethane, was synthesized by nucleophilic substitution reaction under inert atmosphere using Schotten-Baumann conditions and characterized by its melting point, elemental analysis, FT-IR, 1H and
Organocatalytic Double Ugi Reaction with Statistical Amplification of Product Enantiopurity: A Linker Cleavage Approach to Access Highly Enantiopure Ugi Products
Feng, Qi-Yun,Zhu, Jieping,Wang, Mei-Xiang,Tong, Shuo
supporting information, p. 483 - 487 (2020/01/21)
Here we report an organocatalytic double Ugi reaction combining the enantioselective process and ee enhancement in a single operation to afford the chiral Ugi products with very high ee values. Both bisisocyanides and bisanilines tethered by carbonate and diester, respectively, were designed to accomplish this double multicomponent reaction that formed 10 new chemical bonds (4 C-N, 2 C-C, 2 C-O, and 2 N-H bonds). The strategy was further applied for the fast construction of an enantiomerically enriched macrocycle.
Synthesis, characterization and morphological studies of some novel siloxane-based block copolymeric materials containing organometallic as well as organic polyesteramides
Saif Ullah Khan, Muhammad,Akhter, Zareen,Iqbal, Naseer,Siddiq, Mohammad
, p. 312 - 328 (2013/10/01)
A series of semi-aromatic diamine monomers (1,m-bis (4-amino benzoyloxy) alkanes; m = 2-6) having in-built ester linkages with variable methylene spacers were synthesized in two steps from aliphatic diols and p-nitrobenzoyl chloride and characterized by their melting points, elemental analysis, FTIR, 1H and 13C NMR spectroscopic studies. The diamines were then polymerized in-situ with ferrocene-based organometallic and terephthaloyl- as well as isophthaloyl-based organic acyl chlorides along with telechelic polydimethylsiloxane oligomer to produce a novel set of ferrocene-containing siloxane-based block copolymers and their organic analogues. The corresponding polyesteramides of the synthesized copolymers, without siloxane segment, were also prepared for comparative studies. The structural features of the organometallic and organic block copolymers along with their respective polyesteramides were confirmed by their physical properties and spectroscopic studies. The molecular parameters of all these materials were determined by static laser light scattering (LLS) technique and glass transition temperatures (Tg) were obtained by differential scanning calorimetry (DSC). The materials were soluble in sulphuric acid and partially soluble in common organic solvents at room temperature, yet become readily soluble upon N-trifluoroacetylation. The morphological information of the synthesized materials was obtained by X-ray diffraction and surface studies (SEM and AFM).
Reduction of diesters of 1,2-diols. Regioselective C-O bond cleavage of the anionic forms
Macias-Ruvalcaba, Norma A.,Moy, Cheryl L.,Zheng, Zi-Rong,Evans, Dennis H.
, p. 4829 - 4834 (2007/10/03)
The electrochemical reduction of benzoate diesters of glycols has been studied in acetonitrile and N,N-dimethylformamide as solvents. The reductions occur in two closely spaced one-electron steps, and it was found that the dianion diradicals decompose by one of two routes, depending on the substituents on the ethylene moiety: cleavage of two benzoates to produce alkene or formation of benzil by way of a postulated cyclic intermediate to produce also the dianion of the diol. These correspond to cleavage of the R-OC(O)Ar bonds and the RO-C(O)Ar bonds, respectively. When the radical formed by the former cleavage is a primary or secondary radical, the reaction is too slow to compete with the latter reaction that produces benzil. However, when that radical is either tertiary or benzylic, the former cleavage reaction is fast and no benzil is detected. The dianions of p-cyano- and p-nitrobenzoate esters are rather stable on the voltammetric time scale. However, the addition of lithium ions results in detectable formation of 4,4′-dicyanobenzil from four different p-cyanobenzoate diesters.
THE EFFECT OF THE SUBSTITUTION ON THE CONFORMATION IN PARA-SUBSTITUTED ETHYLENE GLYCOL DIBENZOATE MOLECULES
Deguire, Suzanne,Brisse, Francois
, p. 2545 - 2552 (2007/10/02)
The series of ethylene glycol di-para-X-benzoates, when X = Me, OMe, CN, and NO2, has been studied by infrared spectroscopy and solid state CP/MAS 13C nuclear magnetic resonance.The crystal structures were established for X = Me and OMe.Bond distances, bo
Liquid Crystalline Compounds in the Thiophene Series, Part 4. Azomethines and Vinylenes with Central Azobenzene, Stilbene and 1,2-Di(2-thienyl)ethylene Moieties
Kossmehl, Gerhard,Budwill, Detlev
, p. 478 - 488 (2007/10/02)
Azomethines and vinylenes, containing azobenzene, stilbene or 1,2-di(2-thienyl)ethylene moieties as central groups with additional thiophene systems has been synthesized and characterized by their elemental analyses, IR and 1H NMR spectra and studied in r
