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Web11 jun. 2015 · Compound 1 was obtained as a yellow amorphous powder and was assigned a molecular formula of C 21 H 25 N 3 O 4 based on HRESIMS (m / z 406.1751 [M + Na] +; calcd 406.1737) and NMR data ().The UV spectrum showed maxima ascribable to a substituted benzene ring (213 and 270 nm), and the IR spectrum showed the presence … WebAbstract: Numerous real space functions have been purposed so far for unveiling chemically interesting molecular electronic structure characteristics, such as chemical bonds, lone pairs, and multicenter electronic conjugations. Web六甲苯是一种碳氢化合物，化学式 C 12 H 18 ，结构式 C 6 (CH 3) 6 。 它是由苯的六个氢原子都被甲基取代而生的化合物。 1929年， 凯瑟琳·朗斯代尔 （ 英语 ： Kathleen Lonsdale ） 报告了六甲苯的晶体结构，证明苯环是平面六边形的 ，从而结束了关于苯的结构的持续争论。 无论是对于X射线晶体学抑或研究 ... how to download microsoft teams meeting video