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 ̄(13)C-NMR Chemical Shift Study of Natural Coumarin Derivatives Ⅱ── Additive and Degradative Models of Chemical Shifts

Nie Changming;Liu Yuan;Wen Shongnian;Zhou Ying(Central South Institute of Technology 421001,Hengyang,P R China)  
The increments of 13C-NMR chemical shlfts between coumarin derivatives and their parent having better additivity and degradativity rules are discovered with systematic researches on the data of 13C-NMR chemical shifts of natural coumarinderivatives.The additive and degradative models of chemical shifts and their calculation formulas are established.The results indicate that in most cases, calculated values conform to the found values very well.
【Fund】: 国家教委基金
【CateGory Index】: O62
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