Reaction of Thiobenzophenones with Norbornadiene: Unusual Formation of a Seven-membered Cyclic Sulfide

Heterocycles ◽  
1997 ◽  
Vol 45 (7) ◽  
pp. 1281 ◽  
Author(s):  
Kentaro Okuma ◽  
Kyoko Shiki ◽  
Takafumi Shirokawa ◽  
Kazuki Kojima ◽  
Kosei Shioji
Keyword(s):  
Cyclic Sulfide ◽  
Unusual Formation

ChemInform Abstract: Reaction of Thiobenzophenones with Norbornadiene: Unusual Formation of a Seven-Membered Cyclic Sulfide.

ChemInform ◽  
2010 ◽  
Vol 28 (47) ◽  
pp. no-no
Author(s):  
K. OKUMA ◽  
K. SHIKI ◽  
T. SHIROKAWA ◽  
K. KOJIMA ◽  
K. SHIOJI
Keyword(s):  
Cyclic Sulfide ◽  
Unusual Formation

An Unusual Formation of the Superficial Palmar Arch and its Clinical Significance

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Georgi Kotov ◽  
Alexandar Iliev ◽  
Georgi P. Georgiev ◽  
Boycho Landzhov
Keyword(s):  
Clinical Significance ◽  
Superficial Palmar Arch ◽  
Palmar Arch ◽  
Unusual Formation

Unusual formation of α-Fe2O3 hexagonal nanoplatelets in N-doped sandwiched graphene chamber for high-performance lithium-ions batteries

Nano Energy ◽  
2013 ◽  
Vol 2 (2) ◽  
pp. 257-267 ◽  
Author(s):  
Xi Wang ◽  
Wei Tian ◽  
Dequan Liu ◽  
Chunyi Zhi ◽  
Yoshio Bando ◽  
...  
Keyword(s):  
High Performance ◽  
Lithium Ions ◽  
Unusual Formation

scholarly journals Frontispiece: Unusual Formation of CoSe@carbon Nanoboxes, which have an Inhomogeneous Shell, for Efficient Lithium Storage

2016 ◽  
Vol 55 (33) ◽  
Author(s):  
Han Hu ◽  
Jintao Zhang ◽  
Buyuan Guan ◽  
Xiong Wen David Lou
Keyword(s):  
Lithium Storage ◽  
Inhomogeneous Shell ◽  
Unusual Formation

XIII. A description of a very unusual formation of the human heart

1798 ◽  
Vol 88 ◽  
pp. 346-356 ◽  
Keyword(s):  
Human Body ◽  
Human Heart ◽  
Natural Form ◽  
Perfect Knowledge ◽  
Learned Societies ◽  
Circulation Of The Blood ◽  
Unusual Formation

T he heart is an organ of so much importance in the animal oeconomy, and is so immediately concerned in the support of life, that any unusual deviation from its natural form and situation in the human body, has always been considered as a subject of some interest by the physiologist; such deviations have, therefore, not unfrequently been submitted to the consideration of this and other learned Societies. Many circumstances respecting the circulation of the blood, and respiration, wholly unknown to our ancestors, have lately been ascertained; but we are not as yet arrived at a perfect knowledge of these important actions. Difficulties yet remain; more information may still be acquired; and the reasoning upon these subjects will be less liable to fallacy, in proportion to the number of facts which have been observed, and the accuracy of the observations.

Solid State Carbon-13 NMR Studies of Vulcanized Elastomers. II, Sulfur Vulcanization of Natural Rubber

1987 ◽  
Vol 60 (2) ◽  
pp. 252-277 ◽  
Author(s):  
A. M. Zaper ◽  
J. L. Koenig
Keyword(s):  
Solid State ◽  
Nmr Spectra ◽  
Molecular Motion ◽  
Main Chain ◽  
Repeat Unit ◽  
Crosslinking Agent ◽  
Nmr Studies ◽  
Structural Modifications ◽  
Chain Isomerization ◽  
Cyclic Sulfide

Abstract In summary, the solid-state C-13 NMR technique has proven to be a significant method for the detection of crosslinks and other structural modifications in sulfur-vulcanized NR systems. The use of sulfur as a crosslinking agent by itself generates a considerable amount of main-chain structural modifications. Cyclic sulfide structures and cis-to-trans chain isomerization are detected in addition to polysulfidic crosslinks which are found attached to different carbons of the NR repeat unit. The phenomenon of reversion has also been detected in this study. The nature of the spectral broadening in the NMR spectra of the highly cured vulcanizates has two origins. The broadening arises from lack of molecular motion in the system and from an increase in chemical shift dispersion due to the new structures formed with crosslinking.

The Reaction of Sulfur and Sulfur Compounds with Olefinic Substances. IV. The Thermal Decomposition of Organic Polysulfides, and Its Contribution to the Sulfur Olefin-Reaction

1949 ◽  
Vol 22 (2) ◽  
pp. 348-355
Author(s):  
George F. Bloomfield
Keyword(s):  
Thermal Decomposition ◽  
Major Part ◽  
Fission Products ◽  
Sulfur Compounds ◽  
Considerable Proportion ◽  
Elementary Sulfur ◽  
Cross Links ◽  
Organic Polysulfides ◽  
Cyclic Sulfide

Abstract At temperatures in the region of 140°, organic polysulfides undergo disproportionation resulting from thermal fission of S—S bonds and recombination of the fission products. In the presence of olefins a considerable proportion of the fission products become attached to ethylenic centers of the olefin, forming mixed mono- and polysulfides. The major part of the monosulfide product is fully saturated, hydrogen capture occurring during, or subsequent to the formation of adducts from the olefin and sulfurated fragments; unsaturation, however, appears in the polysulfide portion. The polysulfides are capable of producing monothio cross-links between the original olefinic molecules only in so far as they are able to yield up elementary sulfur to the olefin, and when the original olefin is a polyisoprene, the tendency towards the formation of a high proportion of intramolecular cyclic sulfide still further reduces the opportunity for formation of intermolecular sulfur-cross-linked products.

Unusual formation of N-(1-isoquinolinyl)benzamide from 1-o-and 1-m-chlorobenzoylisoquinolines

1977 ◽  
Vol 55 (3) ◽  
pp. 435-437 ◽  
Author(s):  
D. Prasad Aysola ◽  
Martin S. Gibson
Keyword(s):  
Unusual Formation

Syntheses of 1-o- and 1-m-chlorobenzoylisoquinolines are described, (a) from 2-benzoyl-1,2-dihydroisoquinoline-1-carbonitrile and the appropriate chlorobenzaldehyde, and (b) from 2-o- and 2-m-chlorobenzoyl-2-dihydroisoquinoline-1-carbonitrile. Treatment of either ketone with potassamide - potassium tert-butoxide in ammonia gives N-(1-isoquinolinyObenzamide. The mechanism of this reaction is discussed.

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