A novel type rearrangement in cyclic β-dicarbonyl compounds in strong acid media

1981 ◽  
Vol 59 (12) ◽  
pp. 1717-1721 ◽  
Author(s):  
Kimitoshi Saito ◽  
Hidetaka Yuki ◽  
Toshiyuki Ohyama ◽  
Ryohei Nakane ◽  
Katsuyuki Nagumo ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Strong Acid ◽  
Similar Type ◽  
Acid Media ◽  
Dicarbonyl Compounds

5,5-Dimethylcyclohexane-1,3-dione and its derivatives were shown to isomerize to give 5,6-dihydropyran-4-ones on irradiation in FSO3H or 98% H2SO4. The 2,2-dimethyl derivative, lacking hydrogen on C2, failed to give any products under the same conditions. A similar type of isomerization was also observed with thiolane-2,4-dione and its derivatives, while no photoisomerization was observed with their nitrogen or oxygen analogs. A possible reaction mechanism is proposed.

ChemInform Abstract: A NOVEL TYPE REARRANGEMENT IN CYCLIC β-DICARBONYL COMPOUNDS IN STRONG ACID MEDIA

1981 ◽  
Vol 12 (48) ◽  
Author(s):  
K. SAITO ◽  
H. YUKI ◽  
T. OHYAMA ◽  
R. NAKANE ◽  
K. NAGUMO ◽  
...  
Keyword(s):  
Strong Acid ◽  
Acid Media ◽  
Dicarbonyl Compounds

Reaction Mechanism for CCl2F2 Catalytic Decomposition over MoO3/ZrO2

2013 ◽  
Vol 295-298 ◽  
pp. 326-330 ◽  
Author(s):  
Tian Cheng Liu ◽  
Yu Jiao Guo ◽  
Ping Ning ◽  
Ming Long Yuan
Keyword(s):  
Reaction Mechanism ◽  
Main Product ◽  
Solid Acid ◽  
Fixed Bed ◽  
Catalytic Decomposition ◽  
Strong Acid ◽  
Acid Sites ◽  
Fixed Bed Reactor ◽  
Surface Intermediate ◽  
Strong Acid Sites

Catalytic hydrolysis decomposition of dichlorodifluoromethane (CCl2F2) in the presence of water vapor and oxygen was studied over a series of solid acids using a fixed-bed reactor. Solid acid MoO3/ZrO2 displayed the highest activity, over which the conversion of CCl2F2 reached 100 % at 250 °C. CO2 was the main-product and the selectivity to CClF3 remained lower than 28.0 %. CO was not detected as by-product. The decomposition activity depended on the calcination temperature and the ZrO2 content. The activity of solid acid MoO3/ZrO2 correlates well with its specific surface area and the amount of medium-strong acid sites on the surface. To explain the reaction mechanism for CCl2F2 catalytic decomposition over MoO3/ZrO2, a surface intermediate, Osurface-CF2-Osurface is proposed.

Rearrangement of 1-acylaziridines to oxazolinium cations in strong acid media

1970 ◽  
Vol 35 (4) ◽  
pp. 1187-1190 ◽  
Author(s):  
Charles U. Pittman ◽  
Samuel P. McManus
Keyword(s):  
Strong Acid ◽  
Acid Media

Kinetics and mechanism of the formation of methacrylamide from 2-methyl-2-sulphatopropionamide in strong acid media

1991 ◽  
pp. 417 ◽  
Author(s):  
C. Dennis Hall ◽  
Christopher J. Leeding ◽  
Stephen Jones ◽  
Stephen Case-Green ◽  
Ian Sanderson ◽  
...  
Keyword(s):  
Strong Acid ◽  
Kinetics And Mechanism ◽  
Acid Media

Iodosobenzene-Mediated α-Acyloxylation of 1,3-Dicarbonyl Compounds with Carboxylic Acids and Insight into the Reaction Mechanism

2018 ◽  
Vol 83 (5) ◽  
pp. 2904-2911 ◽  
Author(s):  
Chitturi Bhujanga Rao ◽  
Jingwen Yuan ◽  
Qian Zhang ◽  
Rui Zhang ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Carboxylic Acids ◽  
Dicarbonyl Compounds ◽  
Insight Into
Sign in / Sign up

Export Citation Format

Share Document