An AM1 calculational study of the protonation and reactions of 3,4-dihydro-2-oxo-1,4-ethanoquinoline, 3,4-dihydro-2-oxo-1,4-propanoquinoline, 3,3,4,5-tetrahydro-2-oxo-1,5-ethanobenzazepine, 3,3,4,5-tetrahydro-2-oxo-1,5-propanobenzazepine, and <i>N</i>-methyl-4-bromo-2-methylacetanilide
作者:N.H. Werstiuk、R.S. Brown、Q. Wang
DOI:10.1139/v96-057
日期:1996.4.1
of theory with AM1. Calculated enthalpies of N- and O-protonation (proton affinities) indicate that 1a, 1b, and 1c should protonate on nitrogen and 1d, 5a, and 5b on oxygen. A satisfactory straight-line relationship between the calculated proton affinities of 1a, 1b, 1c, and 7 with experimental solution pKa’s is used to estimate the solution pKa of 1d. Results of a calculational study on the gas phase
扭曲酰胺 3,4-dihydro-2-oxo-1,4-ethanoquinoline (1a)、3,4-dihydro-2-oxo-1,4-propanoquinoline (1b) 的气相 N-和 O-质子化, 3,3,4,5-tetrahydro-2-oxo-1,5-ethanobenzazepine (1c) 和 3,3,4,5-tetrahydro-2-oxo-1,5-propanobenzazepine (1d) 和正酰胺 4 -bromo-2,N-二甲基乙酰苯胺 (5a) 和 2,N-二甲基乙酰苯胺 (5b) 以及苯并奎宁环 (7) 的 N-质子化,已在 AM1 的半经验理论水平上进行了计算研究。N-和 O-质子化的计算焓(质子亲和力)表明 1a、1b 和 1c 应在氮上质子化,而 1d、5a 和 5b 应在氧上质子化。1a、1b、1c 和 7 的计算质子亲和力与实验溶液 pKa