A Triplet Carbene Surviving a Week in Solution at Room Temperature
摘要:
A stable triplet carbene, having a lifetime at 25 degrees C of 14.5 days in a dilute benzene solution, was realized by simply changing the substituent at the 10 position of the previously most persistent carbene, di[9-(10-phenyl)anthryl]carbene, from a phenyl to a 2,6-dimethyl-4-tert-butylphenyl group.
Enantioselective synthesis of 10-allylanthrones via iridium-catalyzed allylic substitution reaction
作者:Zheng-Le Zhao、Qing Gu、Xin-Yan Wu、Shu-Li You
DOI:10.1016/j.cclet.2016.02.017
日期:2016.5
Abstract A highly enantioselective allylicsubstitution reaction of anthrones with aromatic or aliphatic allyl carbonates was realized by using iridium catalyst prepared from [Ir(COD)Cl]2 and BHPphos. Substituted 10-allylanthrones were obtained in excellent yields and with excellent enantioselectivity and regioselectivity (up to 98% yield, 99% ee) under mild conditions.
Visible-Light Photocatalytic Aerobic Benzylic C(sp<sup>3</sup>
)−H Oxygenations with the <sup>3</sup>
DDQ*/<i>tert</i>
-Butyl Nitrite Co-catalytic System
aerobic benzylic C(sp3)−H oxygenations of aromatic hydrocarbons and C3‐substituted indoles were studied by employing a co‐catalytic system of 3DDQ* (DDQ=2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone) and tert‐butyl nitrite. The superior efficiency of these reaction conditions was demonstrated by comparison with the analogous thermal protocol, and a range of substrates could be oxidized catalytically and selectively
The object of the present invention is to provide a photobase generator capable of efficiently generating amines (tertiary amines and amidine) high in catalytic activity by sensing light with a wavelength of from 350 to 500 nm (especially, from 400 to 500 nm).
The present invention is a photobase generator characterized in being represented by general formula (1) or (2).
Y
+
is a quaternary ammonio group of general formula (3) to (5), and X
−
is a counter anion selected from among a borate anion, a phenolate anion, and a carboxylate anion.
Provided is a novel donor-acceptor type compound which emits light even in a solid state. The present invention provides an organic optical material comprising a complex formed from (1) a conjugated molecule having (a) at least one electron donating site, (b) at least one electron accepting site, and (c) at least one conjugated site in the same molecule and (2) a compound having a proton donating property or an electron pair accepting property, the complex having a non-covalent interaction at the electron accepting site, wherein the complex is solid at ordinary temperature; and the organic optical material has a property of emitting light having a maximum fluorescence wavelength which causes a Stokes shift having a value corresponding to 5% or more of the value of a maximum absorption wavelength from the maximum absorption wavelength toward the long wavelength side.