Related Products of 1806-29-7, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.1806-29-7, Name is 2,2-Biphenol, molecular formula is C12H10O2. In a patent, introducing its new discovery.
A new type of excited-state intramolecular proton transfer: Proton transfer from phenol OH to a carbon atom of an aromatic ring observed for 2-phenylphenol
The photochemical deuterium incorporation at the 2?-and 4?-positions of 2-phenylphenol (4) and equivalent positions of related compounds has been studied in D2O (CH3OD)-CH3CN solutions with varying D2O (CH3OD) content. Predominant exchange was observed at the 2?-position with an efficiency that is independent of D2O (MeOD) content. Exchange at the 2?-position (but not at the 4?-position) was also observed when crystalline samples of 4-OD were irradiated. Data are presented consistent with a mechanism of exchange that involves excited-state intramolecular proton transfer (ESIPT) from the phenol to the 2?-carbon position of the benzene ring not containing the phenol, to generate the corresponding keto tautomer (an o-quinone methide). This is the first explicit example of a new class of ESIPT in which an acidic phenolic proton is transferred to an sp2-hybridized carbon of an aromatic ring. The complete lack of exchange observed for related substrates 6-9 and for planar 4-hydroxyfluorene (10) is consistent with a mechanism of ESIPT that requires an initial hydrogen bonding interaction between the phenol proton and the benzene pi-system. Similar exchange was observed for 2,2?-biphenol (5), suggesting that this new type of ESIPT is a general reaction for unconstrained 2?-aryl-substituted phenols and other related hydroxyarenes.
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Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare