Stereoselective synthesis of olefins by a reductive coupling reaction
作者:Guoxiong Hua、Yang Li、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1039/b702818k
日期:——
Ketones and aldehydes are converted to symmetrical and (E)-olefins (1-15) by reaction with 2,4-bis(phenyl)-1,3-diselenadiphosphetane-2,4-diselenide (PhPSe(2))(2), Woollins' reagent, in refluxing toluene; use of diketones was demonstrated by the reaction of PhC(O)CH(2)C(O)Ph which gives 1,2,4,5-tetraphenylbenzene (16) in 83% yield.
Diaryl thioketones are selectively reduced with ytterbium metal to diarylmethanethiols, diarylmethanes or tetraarylethylenes, via thiometallacycle intermediates which undergo electrophilic coupling at thiocarbonyl carbon and sulfur.
Aggregation-Induced Emission Rotors: Rational Design and Tunable Stimuli Response
作者:Jie Li、Yang Zhang、Ju Mei、Jacky W. Y. Lam、Jianhua Hao、Ben Zhong Tang
DOI:10.1002/chem.201405118
日期:2015.1.7
A novelmoleculardesignstrategy is provided to rationally tune the stimuli response of luminescent materials with aggregation‐induced emission (AIE) characteristics. A series of new AIE‐active molecules (AIE rotors) are prepared by covalently linking different numbers of tetraphenylethene moieties together. Upon gradually increasing the number of rotatable phenyl rings, the sensitivity of the response