Selective Acetylation of 2-Naphthol to 2-Naphthyl Acetate with Ni Homogeneous Catalysts: An Environmentally Friendly Protocol
Ateeq Rahman,
Veikko Uahengo,
Daniel Shipwiisho Likius,
Mathew Mupa
Issue:
Volume 5, Issue 4, August 2017
Pages:
47-50
Received:
2 June 2017
Accepted:
11 July 2017
Published:
10 August 2017
Abstract: An efficient, selective and simple route for the synthesis of 2-Naphthyl acetate has been developed. In reflux conditions the acetylation of 2-naphthol acetylation with a catalytic amount of Nickel nitrate catalysts afforded 2-Naphthyl acetate in moderate to excellent yields. Nickel nitrate showed the best catalytic performance compared to other Nickel salts. Different weights of nickel salts have been evaluated for the title reaction with 30mg NiNO3 afforded the Best conversions. Different acylating reagents were evaluated acetic acid, acetyl chloride and acetic anhydride, and it was observed that acetic acid was the best acetylating reagent. The protocol has advantages including short reaction times, high chemoselectivity towards acylated product simple work-up. Additionally, nickel nitrate, other additives are not required to enhance the reactions.
Abstract: An efficient, selective and simple route for the synthesis of 2-Naphthyl acetate has been developed. In reflux conditions the acetylation of 2-naphthol acetylation with a catalytic amount of Nickel nitrate catalysts afforded 2-Naphthyl acetate in moderate to excellent yields. Nickel nitrate showed the best catalytic performance compared to other Ni...
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Measurement of Different Heavy Metals Concentration in Roadside Dust in the Vicinity of Gujrat, Pakistan
Nusrat Bashir,
Mujahid Farid,
Rashid Saeed,
Hafiz Muhammad Tauqeer,
Shafaqat Ali,
Muhammad Rizwan,
Ayesha Siddiqua,
Rasham Sallah-Ud-Din
Issue:
Volume 5, Issue 4, August 2017
Pages:
51-57
Received:
18 December 2016
Accepted:
7 March 2017
Published:
29 August 2017
Abstract: Due to rapid urbanization and industrialization in many countries of the world, heavy metals are continuously emitted into the terrestrial environment and posing great threat to human health. The present study was conducted to measure the concentration of six heavy metals, chromium (Cr), nickel (Ni), cobalt (Co), zinc (Zn), cadmium (Cd) and lead (Pb) in roadside dust of five major roads in Gujrat city. The dust samples were collected from five different locations in the vicinity of Gujrat. The results showed that the average concentrations of Cr, Ni, Co, Zn, Cd, and Pb in the dust samples were higher than their permissible limits. The concentrations of Cu, Zn, Cd and Pb were much higher than those in the background value of Gujrat soil. Results clearly concluded that the heavy traffic and transportation is the major responsible source of these heavy metals in the road dust of Gujrat city along with the transportation of sewage sludge, surface runoff from agricultural land and discharge of sewage water from drains.
Abstract: Due to rapid urbanization and industrialization in many countries of the world, heavy metals are continuously emitted into the terrestrial environment and posing great threat to human health. The present study was conducted to measure the concentration of six heavy metals, chromium (Cr), nickel (Ni), cobalt (Co), zinc (Zn), cadmium (Cd) and lead (P...
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Gold Chloride (AuCl3) Catalyzed Expeditious Homocoupling of Terminal Alkynes at Ambient and Solvent Free Conditions: Impact of Sodium Acetate on the Reaction Yield
Saleem Farooq,
Bashir Ahmad Dar,
Mushtaq Ahmad Tantaray,
Mushtaq Ahmad Lone,
Nuzhat Rehman
Issue:
Volume 5, Issue 4, August 2017
Pages:
58-61
Received:
2 July 2017
Accepted:
12 July 2017
Published:
30 August 2017
Abstract: Homocoupling of terminal alkynes to 1, 3-diynes has been investigated, using AuCl3 as catalyst under mild and operationally simple conditions. Effect of different organic and inorganic bases on the product yield and the reaction time were also studied. The catalyst is efficient, furnishes good to excellent yield of the desired products with organic bases and Sodium acetate was found to be the most effective base under solvent free conditions at room temperature.
Abstract: Homocoupling of terminal alkynes to 1, 3-diynes has been investigated, using AuCl3 as catalyst under mild and operationally simple conditions. Effect of different organic and inorganic bases on the product yield and the reaction time were also studied. The catalyst is efficient, furnishes good to excellent yield of the desired products with organic...
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