Azo Nitriles. VI.1The Preparation of Cyclic Hydrazines from Diketones. A New Type of Seven-Membered Ring

1952 ◽  
Vol 74 (13) ◽  
pp. 3290-3292 ◽  
Author(s):  
C. G. Overberger ◽  
Thomas B. Gibb ◽  
Sheldon Chibnik ◽  
Pao-tung Huang ◽  
John J. Monagle
Keyword(s):  
Membered Ring ◽  
New Type

ChemInform Abstract: 13,14-Secosteroids. A New Type of Modified Steroids Containing a Nine-Membered Ring

ChemInform ◽  
2010 ◽  
Vol 30 (43) ◽  
pp. no-no
Author(s):  
Mira S. Bjelakovic ◽  
Ljubinka B. Lorenc ◽  
Vladimir D. Pavlovic ◽  
Mihailo Lj. Mihailovic ◽  
Bernard Tinant ◽  
...  
Keyword(s):  
Membered Ring ◽  
New Type

13,14-Seco-steroids: A New Type of Modified Steroids Containing a Nine-Membered Ring

1999 ◽  
Vol 82 (5) ◽  
pp. 707-721 ◽  
Author(s):  
Mira S. Bjelaković ◽  
Ljubinka B. Lorenc ◽  
Vladimir D. Pavlović ◽  
Mihailo Lj. Mihailović ◽  
Bernard Tinant ◽  
...  
Keyword(s):  
Membered Ring ◽  
New Type

A new type of phosphole dimer incorporating a seven-membered ring

1998 ◽  
Vol 1 (1) ◽  
pp. 53-56
Author(s):  
Ngoc Hoa Tran Huy ◽  
Louis Ricard ◽  
François Mathey
Keyword(s):  
Membered Ring ◽  
New Type

[5-(Adenin-9-yl)-5-deoxypentofuranosyl]phosphonates - A Novel Type of Nucleotide Analogs Related to HPMPA. I. Derivatives with L-arabino, D-arabino, 2-Deoxy-L-erythro and 2-Deoxy-L-threo Configuration

1993 ◽  
Vol 58 (9) ◽  
pp. 2159-2179 ◽  
Author(s):  
Miroslav Otmar ◽  
Ivan Rosenberg ◽  
Milena Masojídková ◽  
Antonín Holý
Keyword(s):  
Biological Activity ◽  
Sodium Salt ◽  
Triethyl Phosphite ◽  
Membered Ring ◽  
Total Loss ◽  
Arbuzov Reaction ◽  
Partial Structure ◽  
Nucleotide Analogs ◽  
New Type

[5-(Adenin-9-yl)-5-deoxypentofuranosyl]phosphonates, a new type of nucleotide analogs with fixed HPMPA structure, have been prepared. The synthesis of compounds of L-arabino (IIa, IIb), D-arabino(XIVa, XIVb), 2-deoxy-L-erythro(IIIa, IIIb) and 2-deoxy-L-threo(IVa, IVb) configuration is based on the Michelis-Arbuzov reaction of the fully protected methyl glycosides with triethyl phosphite and trimethylsilyl triflate which leads to anomeric mixture of diethyl (L-pentofuranosyl) phosphonates. The protected 5-O-tosyl derivatives react with sodium salt of adenine to give N9-substituted products which after total deprotection afforded the tittle nucleotide analogs. The fixation of the partial structure of HPMPA to form five-membered ring leads to a significant decrease, or a total loss, of biological activity.

5,10-seco-steroids, a new type of steroid derivatives containing a ten-membered ring

1964 ◽  
Vol 5 (28) ◽  
pp. 1867-1870 ◽  
Author(s):  
M.Lj. Mihailović ◽  
M. Stefanović ◽  
Lj. Lorenc ◽  
M. Gašić
Keyword(s):  
Membered Ring ◽  
New Type

Eight-membered-ring diaminocarbenes bearing naphthalene moiety in the backbone: DFT studies, synthesis of amidinium salts, generation of free carbene, metal complexes, and solvent-free copper catalyzed azide–alkyne cycloaddition (CuAAC) reaction

2017 ◽  
Vol 46 (13) ◽  
pp. 4331-4345 ◽  
Author(s):  
Gleb A. Chesnokov ◽  
Maxim A. Topchiy ◽  
Pavel B. Dzhevakov ◽  
Pavel S. Gribanov ◽  
Aleksandr A. Tukov ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Membered Ring ◽  
Solvent Free ◽  
Dft Studies ◽  
Cuaac Reaction ◽  
New Type

A new type of eight-membered NHC.

scholarly journals Noble Gas in a Ring

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4677
Author(s):  
Wei-Te Lin ◽  
Ya-Jyun Shih ◽  
Tzu-Jeng Hsu ◽  
Wei-Ping Hu
Keyword(s):  
Density Functional ◽  
Noble Gas ◽  
Electronic Structure Calculations ◽  
Membered Ring ◽  
Unimolecular Dissociation ◽  
Covalent Bonds ◽  
Functional Theory ◽  
New Type ◽  
Structure Calculations ◽  
Cryogenic Conditions

We have designed a new type of molecule with a noble gas (Ng = Kr and Xe) atom in a six-membered ring. Their structures and stability have been studied by density functional theory and by correlated electronic structure calculations. The results showed that the six-membered ring is planar with very short Ng–O and Ng–N polar covalent bonds. The calculated energy barriers for all the unimolecular dissociation pathways are higher than 20 and 35 kcal/mol for Ng = Kr and Xe, respectively. The current study suggests that these molecules and their derivatives might be synthesized and observable at cryogenic conditions.

ChemInform Abstract: BIS(DIORGANYLPHOSPINODITHIOFORMATO-SP)NICKEL(II) COMPLEXES - A NEW TYPE OF FOUR-MEMBERED RING CHELATES

1977 ◽  
Vol 8 (12) ◽  
pp. no-no
Author(s):  
J. KOPF ◽  
R. LENCK ◽  
S. N. OLAFSSON ◽  
R. KRAMOLOWSKY
Keyword(s):  
Membered Ring ◽  
New Type

The Microstructure of Shock-Synthesized Diamond

1967 ◽  
Vol 25 ◽  
pp. 324-325
Author(s):  
Lucien F. Trueb
Keyword(s):  
Single Crystals ◽  
Preferred Orientation ◽  
High Magnification ◽  
Texture Pattern ◽  
Shock Process ◽  
New Type ◽  
Diffraction Diagram

A new type of synthetic industrial diamond formed by an explosive shock process has been recently developed by the Du Pont Company. This material consists of a mixture of two basically different forms, as shown in Figure 1: relatively flat and compact aggregates of acicular crystallites, and single crystals in the form of irregular polyhedra with straight edges.Figure 2 is a high magnification micrograph typical for the fibrous aggregates; it shows that they are composed of bundles of crystallites 0.05-0.3 μ long and 0.02 μ. wide. The selected area diffraction diagram (insert in Figure 2) consists of a weak polycrystalline ring pattern and a strong texture pattern with arc reflections. The latter results from crystals having preferred orientation, which shows that in a given particle most fibrils have a similar orientation.

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