Theoretical Studies of Hyperconjugation in Guanidine Derivaties
碩士 === 國立成功大學 === 化學系 === 104 === Methylation performed on guanidine would destabilize the energy of the highest occupied molecular orbital (HOMO), as well as found earlier for benzene. The N,N-dimethylated biguanide is known as Metformin, which has currently replaced guanidine and biguanide for bio...
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ndltd-TW-104NCKU50650752017-10-01T04:30:03Z http://ndltd.ncl.edu.tw/handle/47553650272682664472 Theoretical Studies of Hyperconjugation in Guanidine Derivaties 以理論計算研究胍類衍生物的超共軛效應 Wan-NingWu 吳婉寧 碩士 國立成功大學 化學系 104 Methylation performed on guanidine would destabilize the energy of the highest occupied molecular orbital (HOMO), as well as found earlier for benzene. The N,N-dimethylated biguanide is known as Metformin, which has currently replaced guanidine and biguanide for biomedical use in treating type-2 diabetes. Di-methylation, however, result in a node-like Nc in the HOMO plots, namely the HOMO of biguanide is separated into two fragmental π-systems on both ends in Metformin. Moreover, the HOMO-energy in Metformin is unexpected lower than that of the parent biguanide. This observation can be understood based on theoretical studies employing the natural bond orbital method: exclusion of the high-lying lone-pair bond orbital on Nc leads to a stabilized HOMO on going from biguanide to metformin. This might underline the biomedical use of metformin for reducing side-effects found for biguanide. Fu-Yung Huang Shao-Pin Wang 黃福永 王小萍 2016 學位論文 ; thesis 157 zh-TW |
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碩士 === 國立成功大學 === 化學系 === 104 === Methylation performed on guanidine would destabilize the energy of the highest occupied molecular orbital (HOMO), as well as found earlier for benzene. The N,N-dimethylated biguanide is known as Metformin, which has currently replaced guanidine and biguanide for biomedical use in treating type-2 diabetes. Di-methylation, however, result in a node-like Nc in the HOMO plots, namely the HOMO of biguanide is separated into two fragmental π-systems on both ends in Metformin. Moreover, the HOMO-energy in Metformin is unexpected lower than that of the parent biguanide. This observation can be understood based on theoretical studies employing the natural bond orbital method: exclusion of the high-lying lone-pair bond orbital on Nc leads to a stabilized HOMO on going from biguanide to metformin. This might underline the biomedical use of metformin for reducing side-effects found for biguanide.
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Fu-Yung Huang |
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Fu-Yung Huang Wan-NingWu 吳婉寧 |
author |
Wan-NingWu 吳婉寧 |
spellingShingle |
Wan-NingWu 吳婉寧 Theoretical Studies of Hyperconjugation in Guanidine Derivaties |
author_sort |
Wan-NingWu |
title |
Theoretical Studies of Hyperconjugation in Guanidine Derivaties |
title_short |
Theoretical Studies of Hyperconjugation in Guanidine Derivaties |
title_full |
Theoretical Studies of Hyperconjugation in Guanidine Derivaties |
title_fullStr |
Theoretical Studies of Hyperconjugation in Guanidine Derivaties |
title_full_unstemmed |
Theoretical Studies of Hyperconjugation in Guanidine Derivaties |
title_sort |
theoretical studies of hyperconjugation in guanidine derivaties |
publishDate |
2016 |
url |
http://ndltd.ncl.edu.tw/handle/47553650272682664472 |
work_keys_str_mv |
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