21645-37-4Relevant academic research and scientific papers
Rhodium(i)-catalyzed mono-selective C-H alkylation of benzenesulfonamides with terminal alkenes
Rej, Supriya,Chatani, Naoto
supporting information, p. 10503 - 10506 (2019/09/12)
The Rh(i)-catalyzed ortho-alkylation of benzenesulfonamides with alkenes with the aid of an 8-aminoquinoline directing group is reported. The reaction is applicable to a variety of benzenesulfonamide derivatives and various alkenes. Curiously, unactivated
Phenylene ring motions in isomeric glassy epoxy networks and their contributions to thermal and mechanical properties
Tu, Jianwei,Tucker, Samuel J.,Christensen, Stephen,Sayed, Abdelwahed R.,Jarrett, William L.,Wiggins, Jeffrey S.
, p. 1748 - 1758 (2015/03/31)
Cross-linked epoxies prepared from diglycidyl ether of bisphenol A (DGEBA) exhibit substantial property differences due to isomeric structures of the diamine curatives, 3,3′- and 4,4′-diaminodiphenyl sulfone (DDS). Here, the motions of phenylene rings on both the bisphenol A (BPA) and DDS structures of the networks were investigated through solid-state NMR 2H line shape analysis to trace the molecular origins. Ring deuterated monomers, namely, DGEBA-d8, 33DDS-d8, and 44DDS-d8, were synthesized, and four deuterated networks were prepared. The line shapes of the ring motions were interpreted using a motional model that described both ring π-flips and main-chain fluctuations. The contributions of different ring motions to mechanical relaxations are elucidated, and the molecular origins of property differences are identified.
Arylphosphonylation and arylazidation of activated alkenes
Kong, Wangqing,Merino, Estibaliz,Nevado, Cristina
supporting information, p. 5078 - 5082 (2014/05/20)
Two radical-mediated processes of activated alkenes, namely arylphosphonylation and arylazidation, are described. The difunctionalization of alkenes by a tandem process that involves radical addition, 1,4-aryl migration, and desulfonylation generates α-ar
Copper-catalyzed trifluoromethylation and cyclization of aromatic-sulfonyl-group-tethered alkenes for the construction of 1,2-benzothiazinane dioxide type compounds
Dong, Xiang,Sang, Rui,Wang, Qiang,Tang, Xiang-Ying,Shi, Min
supporting information, p. 16910 - 16915 (2014/01/06)
A multi-talented system: An efficient copper-catalyzed tandem trifluoromethylation/annulation of an electron-deficient aromatic ring has been developed. This method provides a powerful and straightforward way to synthesize trifluoromethylated 1,2-benzothiazinane dioxides under mild conditions (see scheme). The mechanism was investigated by a series of kinetic experiments and isotopic labeling studies.
The endocyclic restriction test: The geometries of nucleophilic substitutions at sulfur(VI) and sulfur(II)
Jarboe, Stephen G.,Terrazas, Michael S.,Beak, Peter
supporting information; experimental part, p. 9627 - 9632 (2009/04/07)
(Chemical Equation Presented) The trajectories for nucleophilic substitutions at sulfur(VI) and sulfur(II) have been investigated by the endocyclic restriction test. On the basis of double-labeling experiments, the sulfur(VI) transfer in the conversion of 1 to 2 is found to be intramolecular, while the sulfur(VI) transfer in the conversion of 3 to 4 and the sulfur(II) transfer in the conversion of 5 to 6 are found to be intermolecular. These results are taken to be consistent with transition structures for these sulfur transfer reactions which require a large angle between the entering and leaving group, a geometry analogous to apical group positions in trigonal bipyramidal transition states.
