Novel Synthesis of Benzalacetone Analogues of Naphth[a]azulenes by Intramolecular Tropylium Ion-Mediated Furan Ring-Opening Reaction and X-ray Investigation of a Naphth[1,2-a]azulene Derivative

2005 ◽  
Vol 70 (22) ◽  
pp. 8902-8906 ◽  
Author(s):  
Kimiaki Yamamura ◽  
Shizuka Kawabata ◽  
Takatomo Kimura ◽  
Kazuo Eda ◽  
Masao Hashimoto
Keyword(s):  
Ring Opening ◽  
Furan Ring ◽  
X Ray ◽  
Novel Synthesis ◽  
Ring Opening Reaction ◽  
Azulene Derivative

scholarly journals Attempted Synthesis and Unexpected β-Fragmentation of a Hindered β-Keto Nitroxide

2017 ◽  
Vol 70 (10) ◽  
pp. 1106 ◽  
Author(s):  
Chris Edwards ◽  
Peter C. Healy ◽  
W. Ken Busfield ◽  
Ezio Rizzardo ◽  
San H. Thang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ring Opening ◽  
Sodium Tungstate ◽  
Crystallographic Analysis ◽  
High Yield ◽  
Fragmentation Mechanism ◽  
Pentanoic Acid ◽  
X Ray ◽  
Ring Opening Reaction

The attempted synthesis of a β-keto imidazolidinone nitroxide by oxidation of the β-hydroxy imidazolidinone precursor with hydrogen peroxide and sodium tungstate led to an unexpected ring-opening reaction to produce 1,4-diazaspiro[4.5]dec-1-en-3-oxo-2-pentanoic acid 1-oxide (13) in high yield. The structure of 13 was confirmed by X-ray crystallographic analysis. A β-fragmentation mechanism is suggested for the oxidative ring-opening reaction.

scholarly journals Femtosecond x-ray spectroscopy of an electrocyclic ring-opening reaction

Science ◽  
2017 ◽  
Vol 356 (6333) ◽  
pp. 54-59 ◽  
Author(s):  
Andrew R. Attar ◽  
Aditi Bhattacherjee ◽  
C. D. Pemmaraju ◽  
Kirsten Schnorr ◽  
Kristina D. Closser ◽  
...  
Keyword(s):  
Ring Opening ◽  
X Ray ◽  
Ring Opening Reaction

scholarly journals Hydrophobic Modification of Nanocellulose via a Two-Step Silanation Method

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1035 ◽  
Author(s):  
Wensheng Lin ◽  
Xiaoyong Hu ◽  
Xueqing You ◽  
Yingying Sun ◽  
Yueqin Wen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Photoelectron Spectroscopy ◽  
Ring Opening ◽  
Chemical Characteristics ◽  
Surface Chemical ◽  
Hydrophobic Modification ◽  
Step Method ◽  
Water Contact ◽  
X Ray ◽  
Ring Opening Reaction

Dodecyltrimethoxysilane (DTMOS), which is a silanation modifier, was grafted onto nanocellulose crystals (NCC) through a two-step method using KH560 (ɤ-(2,3-epoxyproxy)propytrimethoxysilane) as a linker to improve the hydrophobicity of NCC. The reaction mechanism of NCC with KH560 and DTMOS and its surface chemical characteristics were investigated using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and HCl–acetone titration. These analyses confirmed that KH560 was grafted onto the surface of NCC through the ring-opening reaction, before DTMOS was covalently grafted onto the surface of NCC using KH560 as a linker. The grafting of NCC with DTMOS resulted in an improvement in its hydrophobicity due to an increase in its water contact angle from 0° to about 140°. In addition, the modified NCC also possessed enhanced thermal stability.

A Novel Synthesis of 3-Bromo-1,2-Propanediol from 3-Oxetanol

2013 ◽  
Vol 848 ◽  
pp. 219-222
Author(s):  
Jian Sun ◽  
Shan Shan Gong ◽  
Qi Sun
Keyword(s):  
Mild Condition ◽  
Ring Opening ◽  
Experimental Results ◽  
Carbon Tetrabromide ◽  
Reaction Condition ◽  
Novel Synthesis ◽  
Ring Opening Reaction ◽  
Efficient Route ◽  
Bromination Reaction

Treatment of 3-oxetanol with carbon tetrabromide (CBr4) and triphenylphosphine (PPh3) under mild condition provides an efficient route for synthesis of 3-bromo-1,2-propanediol. The experimental results showed that an unexpected ring-opening reaction was selectively achieved under the routine bromination reaction condition.

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