The effect of a “push–pull” structure on the turn-on fluorescence of photochromic thio-ketone type diarylethenes

2015 ◽  
Vol 14 (4) ◽  
pp. 765-774 ◽  
Author(s):  
Shichong Pang ◽  
Daeun Jang ◽  
Woo Sun Lee ◽  
Hyeok-Mo Kang ◽  
Seung-Ju Hong ◽  
...  
Keyword(s):  
Carbonyl Group ◽  
Sulfur Atom ◽  
Membered Ring ◽  
Turn On ◽  
Closed State

A diarylethene with a six-membered ring carrying an electron-donating sulfur atom and an electron-withdrawing carbonyl group shows fluorescence in its ring-closed state.

ChemInform Abstract: 3a-Azaazulenones Containing a Carbonyl Group in the 5-Membered Ring.

ChemInform ◽  
1988 ◽  
Vol 19 (9) ◽  
Author(s):  
W. FLITSCH ◽  
R. A. JONES ◽  
M. HOHENHORST
Keyword(s):  
Carbonyl Group ◽  
Membered Ring

scholarly journals Unexpected fragmentation of bis(triarylstannanethiocarbonyl)disulfides, formation and X-ray structure of triarylstannyl triarylstannanecarbodithioates

2015 ◽  
Vol 3 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Ihor Kulai ◽  
Oleksii Brusylovets ◽  
Nathalie Saffon ◽  
Zoia Voitenko ◽  
Stéphane Mazières ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Nucleophilic Substitution ◽  
Sulfur Atom ◽  
Driving Force ◽  
Molecular Iodine ◽  
Membered Ring ◽  
X Ray Diffraction ◽  
X Ray ◽  
Intramolecular Nucleophilic Substitution ◽  
Transition Complex

The synthesis of bis(triarylstannanethiocarbonyl)disulfides was attempted by oxidation of lithium triaryl stannane carbodithioates with molecular iodine. Unexpectedly, the desired compounds are highly unstable and undergo subsequent fragmentation giving triarylstannyl triarylstannanecarbodithioates. The proposed mechanism for this transformation assumes intramolecular nucleophilic substitution with formation of six-membered ring transition complex, stabilized by interaction between tin and thiocarbonyl sulfur atom. Obtained compounds were identified by mass-spectrometry and NMR spectroscopies, and their structures were analyzed by X-ray diffraction. These molecules show the existence of intramolecular non-bonding interactions between the sulfur atoms of the thiocarbonyl moieties and tin atoms. These interactions reflect the tin - sulfur affinity and are the main driving force in the fragmen tation of bis(triphenylstannanethiocarbonyl)disulfides.

INTERACTION BETWEEN THE CARBONYL GROUP AND A SULFUR ATOM. PART XI PHOTOELECTRON SPECTRA OF SOME 2-ALKYLTHIOCYCLOPENTANONES

1983 ◽  
Vol 16 (3) ◽  
pp. 287-291 ◽  
Author(s):  
Camille Sandorfy ◽  
Jerry W. Lewis ◽  
Blanka Wladislaw ◽  
Isabel C. C. Calegäo
Keyword(s):  
Carbonyl Group ◽  
Sulfur Atom ◽  
Photoelectron Spectra

3a-Azaazulenones containing a carbonyl group in the 5-membered ring

1987 ◽  
Vol 28 (38) ◽  
pp. 4397-4398 ◽  
Author(s):  
Wilhelm Flitsch ◽  
R.Alan Jones ◽  
Manfred Hohenhorst
Keyword(s):  
Carbonyl Group ◽  
Membered Ring

Silaheterocyclen, VII. Reaktionen des Dichlorneopentylsilaethens mit Aldehyden / Silaheterocycles, VII. Reactions of Dichloroneopentylsilene with Aldehydes

1990 ◽  
Vol 45 (6) ◽  
pp. 909-920 ◽  
Author(s):  
Norbert Auner ◽  
Claudia Seidenschwarz
Keyword(s):  
Carbonyl Group ◽  
Aromatic Aldehydes ◽  
Product Formation ◽  
Membered Ring ◽  
Coupling Reactions ◽  
Zwitterionic Intermediate

Dichloroneopentylsilene, Cl2Si=CHCH2Bu' (1), is produced from vinyltrichlorosilane (2) and LiBu' in n-pentane at —78 °C. The reactions of 1 with aromatic aldehydes like benzaldehyde and the 4-methoxy- or 4-fluoro-substituted derivatives, naphthalene-1- and -2- and 9-anthracenecarbaldehyde, furfurale and its S-analogous thiophene carbaldehyde yield 1,2-silaoxetanes by [2+2] cycloaddition with the carbonyl group. The same is true for the reactions of 1 with pivaline-, butyr- and acetaldehyde. The silaoxetanes cannot be isolated; the formation of dichlorovinylsiloxanes and the olefinic compounds R—CH=CH —CH2Bu′suggests that the cycloreversion of the Si—O four-membered ring competes with an intramolecular isomerization, evidently via formation of a zwitterionic intermediate . The product formation by coupling reactions of lithiated aldehydes and 2 is excluded by performing analogous reactions with the chlorosilanes Me2SiCl(R) (R = Cl, Me, Vi).

Mass Spectra of Spirobenzylisoquinoline Alkaloids

1971 ◽  
Vol 49 (18) ◽  
pp. 3025-3037 ◽  
Author(s):  
C. K. Yu ◽  
D. B. MacLean
Keyword(s):  
Carbonyl Group ◽  
Mass Spectra ◽  
Major Ions ◽  
Membered Ring ◽  
Hydroxyl Group ◽  
Model Compounds ◽  
Fragmentation Mechanisms

The mass spectra of a number of spirobenzylisoquinoline alkaloids, several of their derivatives, and some model compounds are recorded and discussed. Fragmentation mechanisms are proposed for the formation of the major ions in the spectra of compounds containing one and two oxygen functions in the five-membered ring. The spectra of compounds containing a carbonyl group differ markedly from those having a hydroxyl group in the five-membered ring. Several model compounds were synthesized and characterized and their spectra compared with those of the alkaloids.

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