Crystal and molecular structures of the pentaacetates of d-gluconic acid and derived tert-butyl- and tert-butylperoxyesters and the tetra-O-acetyl-1,2-O-tert-butyl-peroxyorthoacetyl derivative
作者:Peter Köll、Rainer Bruns、Jürgen Kopf
DOI:10.1016/s0008-6215(97)10019-2
日期:1997.12
Abstract The crystal structures of 2,3,4,5,6- penta -O- acetyl- d -gluconic acid ( 1 ), 2,3,4,5,6- penta -O- acetyl- d -gluconic acid tert -butylester ( 2 ), 2,3,4,5,6- penta -O- acetyl- d -gluconic acid tert -butylperoxyester ( 3 ) and 3,4,5,6- tetra -O- acetyl -1,2-(tert- butylperoxyorthoacetyl)- d -gluconic acid ( 4 ) were determined by X-ray crystallography, using direct methods, and refined to
摘要
2,3,4,5,6-五-O-乙酰基-d-
葡萄糖酸的晶体结构(1),
2,3,4,5,6-五-O-乙酰基-d-
葡萄糖酸叔酸-丁酯(2),
2,3,4,5,6-五-O-乙酰基-d-
葡萄糖酸叔丁基过氧酸酯(3)和3,4,5,6-四-O-乙酰-1,2使用直接方法,通过X射线晶体学测定-(叔丁基过氧原乙酰基)-d-
葡萄糖酸(4),并且将其精炼为最终的常规残留参数,分别为R = 0.050、0.037、0.042和0.042。在所有情况下,均采用碳链的平面之字形构象,从而在O-2和O-4之间产生1,3-平行相互作用。在图2中,观察到O-3与C-1处的酯化氧之间的第二次1,3-平行排列。3中的过氧羰基基团基本上是平面的,其对于O 3 O键的扭转角对于3为-119°,对于4为145°。