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

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.

5-(5-Ethyl-1,3,4-thiadiazol-2-ylaminomethylene)-2,2-dimethyl-1,3-dioxane- 4,6-dione

2006 ◽  
Vol 62 (4) ◽  
pp. o1520-o1521 ◽  
Author(s):  
Luiz Everson da Silva ◽  
Antonio Carlos Joussef ◽  
Carla Regina Andrighetti-Fröhner ◽  
Cláudia Maria Olivra Simões ◽  
Adailton José Bortoluzzi
Keyword(s):  
Hydrogen Bond ◽  
Carbonyl Group ◽  
Title Compound ◽  
Functional Group ◽  
Chair Conformation ◽  
Membered Ring ◽  
Intramolecular Contact ◽  
Compound C ◽  
Thiadiazole Ring

In the title compound, C11H13N3O4S, the thiadiazole ring is nearly planar, while the 1,3-dioxane-4,6-dione ring exhibits a half-chair conformation. The NH group makes one intramolecular contact with a carbonyl group, forming a six-membered ring. The same functional group is involved in an intermolecular N—H...N hydrogen bond.

Conjugation of a three-membered ring with a carbonyl group

1961 ◽  
Vol 2 (2) ◽  
pp. 138-141 ◽  
Author(s):  
E. V. Sobolev ◽  
V. T. Aleksanyan ◽  
Kh. E. Sterin ◽  
M. Yu. Lukina ◽  
L. G. Cherkashina
Keyword(s):  
Carbonyl Group ◽  
Membered Ring

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.

scholarly journals tert-Butyl (3-oxocyclopentyl)carbamate

IUCrData ◽  
2017 ◽  
Vol 2 (10) ◽  
Author(s):  
Alan J. Lough ◽  
Katrina Tait ◽  
William Tam
Keyword(s):  
Hydrogen Bonds ◽  
Carbonyl Group ◽  
Title Compound ◽  
Membered Ring ◽  
Tert Butyl ◽  
Envelope Conformation ◽  
Compound C

In the title compound, C10H17NO3, the five-membered ring is in a slightly twisted envelope conformation. The carbonyl group is disordered over two sites on the five-membered ring, with refined occupancies of 0.906 (4) and 0.094 (4). In the crystal, molecules are linkedviaN—H...O hydrogen bonds formingC(4) chains along [001].

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