23667-32-5Relevant academic research and scientific papers
N,N-dimethylformamide-mediated sodium reduction of frans-3,3′- benzo[c]thienylidene-1,1′ dithione and frans-3,3′-benzo[c] selenonylidene-1,1′-dithione
Aqad, Emad,Lakshmikantham,Cava, Michael P.
, p. 3039 - 3041 (2004)
(Chemical Equation Presented) The synthesis of stable methylthio-capped biisothianaphthene and biisoselenophene derivatives has been achieved using DMF-mediated sodium reduction of cyclic thiocarbonyl compounds.
Multiple-State Emissions from Neat, Single-Component Molecular Solids: Suppression of Kasha's Rule
Chen, Bin,Chen, Yu-Zhe,Tung, Chen-Ho,Weiss, Richard G.,Wu, Li-Zhu,Wu, Ya-Hang,Xiao, Hongyan
supporting information, p. 10173 - 10178 (2020/03/13)
Three rigid and structurally simple heterocyclic stilbene derivatives, (E)-3H,3′H-[1,1′-biisobenzofuranylidene]-3,3′-dione, (E)-3-(3-oxobenzo[c] thiophen-1(3H)-ylidene)isobenzofuran-1(3H)-one, and (E)-3H,3′H-[1,1′-bibenzo[c] thiophenylidene]-3,3′-dione, are found to fluoresce in their neat solid phases, from upper (S2) and lowest (S1) singlet excited states, even at room temperature in air. Photophysical studies, single-crystal structures, and theoretical calculations indicate that large energy gaps between S2 and S1 states (T2 and T1 states) as well as an abundance of intra and intermolecular hydrogen bonds suppress internal conversions of the upper excited states in the solids and make possible the fluorescence from S2 excited states (phosphorescence from T2 excited states). These results, including unprecedented fluorescence quantum yields (2.3–9.6 %) from the S2 states in the neat solids, establish a unique molecular skeleton for achieving multi-colored emissions from upper excited states by “suppressing” Kasha's rule.
First Rational Synthesis of the Thiothiono Analogue of an Unsymmetrically Substituted Phthalic Anhydride
Morrison, Christopher F.,Burnell, D. Jean
, p. 3891 - 3892 (2007/10/03)
equation presented Treatment of the dithiolane derivative of an α-carboxyethyl benzaldehyde with LDA at -78°C smoothly produced the thiothionophthalic anhydride. The mechanism is proposed to involve loss of ethene and attack of an intermediate dithiocarboxylate onto the ester. Heating the thiothionophthalic anhydride gave the 3,3′-bithiophthalide.
ASPECTS OF THIOANHYDRIDE CHEMISTRY
Cava, M. P.,Lakshmikantham, M. V.
, p. 95 - 110 (2007/10/02)
Cyclic anhydrides consitute one of the most thoroughly studies classes of organic compounds.In contrast, very little is as yet known concerning the thiocarbonyl analogs of cyclic anhydrides.In this lecture, the present status of thioanhydride chemistry will be reviewed, with emphasis on studies from our laboratory.
New Olefin and Oxiran Syntheses from Carbonyl Compounds, and Diethyl Sodiophosphonate Anions and 1-Aminophosphonate Amino-anions
Minami, Toru,Matsuzaki, Narihide,Ohshiro, Yoshiki,Agawa, Toshio
, p. 1731 - 1738 (2007/10/02)
Reaction of aromatic aldehydes, and phthalic and thiophthalic anhydrides, with diethyl sodiophosphonate (1) gives the trans-stilbenes (3), 3,3'-biphthalidylidene (30), and 3,3'-bis-(2-thiophthalidylidene) (33).Similar treatment of fluorenone (8) and xanthone (17) with (1) leads to 9,9'-bis(fluororenylidene) (9) and 9,10-dihydro-9-oxophenanthrene-10-spiro-9'-fluorene (10), and to 9,9'-bixanthenylidene (18) and 9,9'-bixanthenyl (19), respectively, but the reaction using anthrone (11) as a carbonyl reagent yields only anthraquinone (12) and anthracene (13).Similar treatment using N-methylisatoic anhydride (34) and N-methylisatin (36) produces NN'-dimethylisoindigo (35).Reaction of benzaldehyde and p-chlorobenzaldehyde with diethyl 1--cyclohexylphosphonate (40) gives mainly corresponding mixtures of trans- (41a,b) and cis-stilbene epoxides (42a,b), while similar treatment of p-nitrobenzaldehyde with (40) produces 4,4'-dinitrostilbene (3e).Reaction of (8) with (40), as well as with (1), gives (9) and (10).The mechanism of formation of these products is discussed.
