DR ANTHONY MELVIN CRASTO,WorldDrugTracker, helping millions, A 90 % paralysed man in action for you, I am suffering from transverse mylitis and bound to a wheel chair, With death on the horizon, nothing will not stop me except God................DR ANTHONY MELVIN CRASTO Ph.D ( ICT, Mumbai) , INDIA 25Yrs Exp. in the feld of Organic Chemistry,Working for GLENMARK GENERICS at Navi Mumbai, INDIA. Serving chemists around the world. Helping them with websites on Chemistry.Million hits on google, world acclamation from industry, academia, drug authorities for websites, blogs and educational contribution
Showing posts with label epoxidation of styrene. Show all posts
Showing posts with label epoxidation of styrene. Show all posts

Monday, 18 May 2015

Cobalt nanoparticles in hollow mesoporous spheres as a highly efficient and rapid magnetically separable catalyst for selective epoxidation of styrene with molecular oxygen

.



Cobalt nanoparticles in hollow mesoporous spheres as a highly efficient and rapid magnetically separable catalyst for selective epoxidation of styrene with molecular oxygen

Zhi-Qiang Shi,ab   Li-Xin Jiao,ab   Jian Sun,ab   Zi-Bao Chen,a  Yuan-Zhe Chen,ab   Xiao-Hang Zhu,ab   Jing-Hui Zhou,ab  Xin-Chun Zhou,ab   Xin-Zhe Liab and   Rong Li*ab  

*
Corresponding authors
a
State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, China 
E-mail: liyirong@lzu.edu.cn
Fax: +86 0931 891 2582 
Tel: +86 0931 891 2311
b
The Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering Lanzhou University, Lanzhou 730000, China
RSC Adv., 2014,4, 47-53

DOI: 10.1039/C3RA45383A



























Uniform rattle-type hollow mesoporous spheres (HMS) with large cavities have been successfully prepared by the colloidal carbon spheres as templates. The spheres are well monodispersed and nearly uniform in dimension with particle size of ca. 150 nm. Co nanoparticles composed of HMS were found to be a highly efficient catalyst for selective epoxidation of styrene under mild reaction conditions. The catalysts can be easily separated from the reaction mixtures by an external magnet, and reused five times without significant loss of catalytic activity.







Graphical abstract: Cobalt nanoparticles in hollow mesoporous spheres as a highly efficient and rapid magnetically separable catalyst for selective epoxidation of styrene with molecular oxygen
..............

 STYRENE OXIDE



 













 EXTRAS FROM NET
Chiral GC
Column: Supelco (#24301): -DEX 110 30 m capillary column
Carrier Gas: Helium
Pressure: 22 psi
Split Ratio: 50:1
Detector: Flame Ionization Detector (FID)
Styrene Oxide Analysis:
Oven Temperature: 100 °C
Retention times of the two enantiomers: 10.3 and 10.6 min
Typical percentages of the two enantiomers using catalyst synthesized using L-Tartaric acid: 92.7% (10.3 min RT), 7.3% (10.6 min RT)
Typical percentages of the two enantiomers using catalyst synthesized using D-Tartaric acid: 2.7% (10.3 min RT), 97.2% (10.6 min RT)
1-Phenyl-1,2-ethanediol Acetonide Analysis:
Oven Temperature: 130 °C
Retention time of the two enantiomers: 9.6 and 9.9 min
Typical percentages of the two enantiomers using catalyst synthesized using L-Tartaric acid: 4.7% (9.6 min RT), 95.3% (9.9 min RT)
Typical percentages of the two enantiomers using catalyst synthesized using D-Tartaric acid: 96.0% (9.6 min RT), 4.0% (9.9 min RT)
Optical Rotation
Jacobsen reports that the R enantiomer of styrene oxide is the major one remaining using the (R,R) catalyst. (This is the catalyst produced using the L-Tartaric acid.) For a sample with >99% ee he reports: []23D +28.6° (neat).
Jacobsen reports that the S enantiomer of the diol is the major one produced using the (R,R) catalyst. (This is the catalyst produced using the L-Tartaric acid.) For a sample with 95% ee he reports: []23D +38.4° (c 4.38, EtOH).






tirupati, india
Map of tirupati town.





Tirupati
తిరుపతి
City
Clockwise from top: Tirumala Venkateswara Temple, Tirumala ghat road, City skyline and Chandragiri fort
Clockwise from top: Tirumala Venkateswara Temple, Tirumala ghat road, City skyline and Chandragiri fort
Tirupati is located in Andhra Pradesh
Tirupati
Tirupati
Location in Andhra Pradesh, India
Coordinates: 13.65°N 79.42°ECoordinates: 13.65°N 79.42°E
Country India
State Andhra Pradesh
Region Rayalaseema
District Chittoor
Government
 • Member of Parliament Varaprasad Rao Velagapalli
Area
 • City 24 km2 (9 sq mi)
Elevation 161 m (528 ft)
Population (2011)[1]
 • City 287,035
 • Density 12,000/km2 (31,000/sq mi)
 • Metro[2] 459,985
Languages
 • Official Telugu
Time zone IST (UTC+5:30)
PIN 517501
Telephone code +91–877
Vehicle registration AP 03
Website Tirupati Mucnicipal Corporation
 




.


.
Kapila Theertham in Tirupati


 



 

 

 
 

 


 

Food Service During Tirumala Tirupati Devastanam's 'Srinivasa Kalyanam Utsavam' at MARG Swarnabhoomi


 

 




/////////////