64918-93-0Relevant articles and documents
Direct Allylic C(sp3)?H and Vinylic C(sp2)?H Thiolation with Hydrogen Evolution by Quantum Dots and Visible Light
Huang, Cheng,Ci, Rui-Nan,Qiao, Jia,Wang, Xu-Zhe,Feng, Ke,Chen, Bin,Tung, Chen-Ho,Wu, Li-Zhu
supporting information, p. 11779 - 11783 (2021/04/21)
Direct allylic C?H thiolation is straightforward for allylic C(sp3)?S bond formation. However, strong interactions between thiol and transition metal catalysts lead to deactivation of the catalytic cycle or oxidation of sulfur atom under oxidative condition. Thus, direct allylic C(sp3)?H thiolation has proved difficult. Represented herein is an exceptional for direct, efficient, atom- and step-economic thiolation of allylic C(sp3)?H and thiol S?H under visible light irradiation. Radical trapping experiments and electron paramagnetic resonance (EPR) spectroscopy identified the allylic radical and thiyl radical generated on the surface of photocatalyst quantum dots (QDs). The C?S bond formation does not require external oxidants and radical initiators, and hydrogen (H2) is produced as byproduct. When vinylic C(sp2)?H was used instead of allylic C(sp3)?H bond, the radical-radical cross-coupling of C(sp2)?H and S?H was achieved with liberation of H2. Such a unique transformation opens up a door toward direct C?H and S?H coupling for valuable organosulfur chemistry.
Difunctional Blocking Groups for Rotaxanes and Polyrotaxanes
Liu, Shu,Gibson, Harry W.
, p. 8533 - 8536 (2007/10/02)
Several bulky monomers for polyrotaxanes, including α,α,ω,ω-tetraarylmethyl bisphenol 9, diethyl di(p-t-butylbenzyl)malonate (10), and 1,1-di(p-t-butylphenyl)ethene (12), were synthesized.All the intermediates (8, 11) and final products (9, 10, and 12) ar
Clathrate Formers with Allene Structure - Host Compounds, Crystal Inclusion and Structure of a Dioxane Clathrate
Weber, Edwin,Seichter, Wilhelm,Goldberg, Israel
, p. 811 - 820 (2007/10/02)
The tetraaryl-substituted allenes 1-8 are synthesized, and their properties in crystal inclusion are determined.Dependent on the type and number of the substituents, host compounds result, which have different inclusion properties and clathrate selectivities.Host 1h forms inclusion compounds with a wide range of apolar and relatively polar cyclic guest solvents (26 inclusions altogether), while 2, 4, 5, and 7b form only one or two inclusions.In two-component solvent systems, high inclusion selectivities are found for the host compounds.The crystal structure of the4*dioxane (1:1) clathrate is reported.Relations between structure and inclusion selectivity are discussed.