Archives for Chemistry Experiments of 6-Bromo-2,3-dihydrobenzofuran-3-ol

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 1392072-52-4, name is 6-Bromo-2,3-dihydrobenzofuran-3-ol, introducing its new discovery. Application In Synthesis of 6-Bromo-2,3-dihydrobenzofuran-3-ol

Carbon-13 chemical shifts of the alpha- and beta-carbon atoms for 12 thietane 1,1-dioxides, 9 thietane 1-oxides and 7 thietanes with a variety of 3-substituents are correlated according to the nature of the sulfur atom (Y=sulfone, sulfoxide, sulfide) and the nature of the 3-substituent (X) by the equations deltaalpha=aY+bX and deltabeta=aX+bY, where a and b are parameters characteristic of X and Y.One-bond coupling constants are reported for 21 compounds.The chemical shifts for the alpha- and the beta-carbon atoms of the sulfones show the “four-membered ring sulfone effect” (alpha-carbon unusually deshielded, beta-carbon unusually shielded), but the alpha-carbon-hydrogen coupling constants are similar to those of the sulfoxides and sulfides; the beta-carbon-hydrogen coupling constants are sensitive to the nature of the substituent (X) but no special beta-effect is observed.Comparison of the chemical shifts of the alpha-methylene carbon atoms of 3-phenyl-, 3-(beta-naphthyl)- and 3-(alpha-thienyl)-thietes with those of the corresponding sulfones also reveals the “four-membered ring sulfone effect” cis- and trans-3-substituted thietane 1-oxides may be distinguished by the greater downfield shift for the beta-carbon atom in the trans-isomer.

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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H3652O – PubChem