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Date: 6-4-2016
3007
Date: 25-7-2017
1016
Date: 31-8-2017
842
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CYCLIC OLIGOMERS OF BUTADIENE
Butadiene could be oligomerized to cyclic dienes and trienes using certain transition metal complexes. Commercially, a mixture of TiCl4 and Al2Cl3(C2H5)3 is used that gives predominantly cis, trans, trans- 1,5,9-cyclododecatriene along with approximately 5% of the dimer 1,5-cyclooctadiene :
1,5,9-Cyclododecatriene is a precursor for dodecane-dioic acid through a hydrogenation step followed by oxidation. The diacid is a monomer for the production of nylon 6/12. Cyclododecane from cyclododecatriene may also be converted to the C12 lactam, which is polymerized to nylon 12.
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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اتحاد كليات الطب الملكية البريطانية يشيد بالمستوى العلمي لطلبة جامعة العميد وبيئتها التعليمية
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