Photochemistry of 2′-substituted 1,2,3,4-tetrahydronaphthalene-1-spiro-3′oxaziridines. Variable-temperature<sup>1</sup>H nuclear magnetic resonance spectroscopy of 1-substituted 1,3,4,5-tetrahydro-2H-1-benzazepin-2-ones
作者:Graham P. Johnson、Brian A. Marples
DOI:10.1039/p19880003399
日期:——
The lack of regioselectivity of photorearrangement of the title spiro-oxaziridines in which the N-substituent is syn to the aromatic ring suggests that the first formed N–O–bond-cleaved species has a significant lifetime allowing rotation (inversion) to compete with rearrangement. The energy barrier to ring inversion of the title tetrahydro-1-benzazepin-2-ones is significantly influenced by the steric
缺少其中的标题螺-氧氮环丙烷的photorearrangement的区域选择性ñ -取代的顺式与芳香环表明先形成N-O键裂解物种具有显著寿命允许的旋转(反转)与重排竞争。N-取代基与周围氢原子之间的空间相互作用显着影响标题四氢-1-苯并ze庚因-2-酮环转化的能垒。