The 1st International Printing Technology Exhibition of China (Guangdong) will be held at Guangdong Modern International Exhibition Center from April 10 to April 14, 2007. The show space was originally expected to be ...The 1st International Printing Technology Exhibition of China (Guangdong) will be held at Guangdong Modern International Exhibition Center from April 10 to April 14, 2007. The show space was originally expected to be 50000 square meters. At present, more than 75000 square meters have been booked. The organizers are considering building tent to展开更多
The China National Industrial Machinery Import & Export Company, a wholly-owned subsidiary of the China National Machinery Import & Export Corporation, has established longterm cooperative relations with busin...The China National Industrial Machinery Import & Export Company, a wholly-owned subsidiary of the China National Machinery Import & Export Corporation, has established longterm cooperative relations with business people in dozens of countries and regions around the world. Between 1988 and 1994, the imports and exports handled by the company totalled US$2.5 billion. Since the 1950s, the company has imported quantities of machine tools and processing equipment for the China No. 1 Automobile Plant, the China No.2 Automobile Plant, various heavy-duty machinery plants, machine-tool factories and textile mills in China. The company’s traditional imports are展开更多
The Beijing Light Industrial Products Import and Export Corporation is under the Beijing Municipal Foreign Economic and Trade Commission. It is a state-owned specialized foreign trading corporation founded in 1964. Th...The Beijing Light Industrial Products Import and Export Corporation is under the Beijing Municipal Foreign Economic and Trade Commission. It is a state-owned specialized foreign trading corporation founded in 1964. Through constant development and growth, the corporation has established business relations with over 2,000 customers in over 100 countries and regions worldwide. Domestically,展开更多
The syntheses of carbon dioxide(CO_(2))based industrially important chemicals have gained considerable interest in view of the sustainable chemistry and“green chemistry”concepts.In this review,recent developments in...The syntheses of carbon dioxide(CO_(2))based industrially important chemicals have gained considerable interest in view of the sustainable chemistry and“green chemistry”concepts.In this review,recent developments in the chemical fixation of CO_(2)to valuable chemicals are discussed.The synthesis of five-member cyclic carbonates via,cycloaddition of CO_(2)to epoxides is one of the promising reactions replacing the existing poisonous phosgene-based synthetic route.This review focuses on the synthesis of cyclic carbonates,vinyl carbamates,and quinazoline-2,4(1H,3H)-diones via reaction of CO_(2)and epoxide,amines/phenyl acetylene,2-aminobenzinitrile and other chemicals.Direct synthesis of dimethyl carbonate,1,3-disubstituted urea and 2-oxazolidinones/2-imidazolidinones have limitations at present because of the reaction equilibrium and chemical inertness of CO_(2).The preferred alternatives for their synthesis like transesterification of ethylene carbonate with methanol,transamination of ethylene carbonate with primary amine and transamination reaction of ethylene carbonate with diamines/β-aminoalcohols are discussed.These methodologies offer marked improvements for greener chemical fixation of CO_(2)in to industrially important chemicals.展开更多
文摘The 1st International Printing Technology Exhibition of China (Guangdong) will be held at Guangdong Modern International Exhibition Center from April 10 to April 14, 2007. The show space was originally expected to be 50000 square meters. At present, more than 75000 square meters have been booked. The organizers are considering building tent to
文摘The China National Industrial Machinery Import & Export Company, a wholly-owned subsidiary of the China National Machinery Import & Export Corporation, has established longterm cooperative relations with business people in dozens of countries and regions around the world. Between 1988 and 1994, the imports and exports handled by the company totalled US$2.5 billion. Since the 1950s, the company has imported quantities of machine tools and processing equipment for the China No. 1 Automobile Plant, the China No.2 Automobile Plant, various heavy-duty machinery plants, machine-tool factories and textile mills in China. The company’s traditional imports are
文摘The Beijing Light Industrial Products Import and Export Corporation is under the Beijing Municipal Foreign Economic and Trade Commission. It is a state-owned specialized foreign trading corporation founded in 1964. Through constant development and growth, the corporation has established business relations with over 2,000 customers in over 100 countries and regions worldwide. Domestically,
基金the All India Council for Technical Education(AICTE),India through Grant No.8023/BOR/RID/RPS-58/2008-09 for providing financial support for this work.
文摘The syntheses of carbon dioxide(CO_(2))based industrially important chemicals have gained considerable interest in view of the sustainable chemistry and“green chemistry”concepts.In this review,recent developments in the chemical fixation of CO_(2)to valuable chemicals are discussed.The synthesis of five-member cyclic carbonates via,cycloaddition of CO_(2)to epoxides is one of the promising reactions replacing the existing poisonous phosgene-based synthetic route.This review focuses on the synthesis of cyclic carbonates,vinyl carbamates,and quinazoline-2,4(1H,3H)-diones via reaction of CO_(2)and epoxide,amines/phenyl acetylene,2-aminobenzinitrile and other chemicals.Direct synthesis of dimethyl carbonate,1,3-disubstituted urea and 2-oxazolidinones/2-imidazolidinones have limitations at present because of the reaction equilibrium and chemical inertness of CO_(2).The preferred alternatives for their synthesis like transesterification of ethylene carbonate with methanol,transamination of ethylene carbonate with primary amine and transamination reaction of ethylene carbonate with diamines/β-aminoalcohols are discussed.These methodologies offer marked improvements for greener chemical fixation of CO_(2)in to industrially important chemicals.
