甲基取代不同类型碳原子上的氢原子所表现出的诱导效应强度  

INDUCTIVE EFFECT OF METHYL RELATIVE TO H OF DIFFERENT CARBON ATOM

作　　者：杨金瑞[1] 余尚先[1] 顾江楠[1] 

机构地区：[1]北京师范大学应用化学研究所,北京100875

出　　处：《北京师范大学学报（自然科学版）》2006年第3期283-286,共4页Journal of Beijing Normal University(Natural Science)

摘　　要：通过13CNMR测定的碳原子化学位移,计算不同类型碳原子上的氢原子被甲基取代后,该碳原子化学位移的变化值Δδ,Δδ多在-(9.0±3.0)之间,证实甲基相对于氢原子,是一个具有吸电子诱导效应的基团,吸电子诱导效应强度随碳原子类型的不同而略有不同.The difference between chemical shifts of a carbon and the value when one H of the carbon is substituted by methyl is denominated as △δ, which represents the ability of inductive effect of the methyl. △δ can be calculated in different conditions based on ^13CNMR, and most of them are between -6. 0 and -12. 0, which indicates that methyl is electron-withdrawing relative to H. △δ changes little because of the type of carbon bonded to methyl.

关 键 词：13CNMR 化学位移 甲基 诱导效应 

分 类 号：O621.23[理学—有机化学]