How Much Does the Hybridization of a Carbon Atom Affect the Transmission of the Substituent Effect on the Chemical Shift?
作者:Eun Jeong Jeong、In-Sook Han Lee
DOI:10.1002/bkcs.10067
日期:2015.1
systematically examined to find out the substituent effect on the chemical shift. The values of the chemical shift of the carbonyl carbon showed an inverse correlation with the Hammett σ values, and the magnitude of the slope was the largest with the propiolates. The α carbons of acrylates and propiolates also showed an inverse correlation with much smaller values of the slopes than those of the carbonyl carbons;
1 H和13系统检查了丙酸,丙烯酸和丙酸的芳基酯的13 C NMR光谱,以了解取代基对化学位移的影响。羰基碳的化学位移值与Hammettσ值呈反比关系,且斜率的大小与丙酸酯的比值最大。丙烯酸酯和丙酸酯的α碳也显示出负相关,其斜率值比羰基碳小得多。但是那些丙酸的人绝对没有关联。但是,丙烯酸酯和丙酸酯的β碳与较大的斜率值呈正相关。斜率的符号和大小可以通过取代基电子效应通过键和空间的传递来理解。苯环的13 C化学位移值。
Krausz,F.; Martin,R., Bulletin de la Societe Chimique de France, 1965, p. 2192 - 2197
作者:Krausz,F.、Martin,R.
DOI:——
日期:——
Synthesis and activity of 2-methyl-3-aminopropiophenones as centrally acting muscle relaxants
Some novel 2-methyl-3-aminopropiophenones were synthesized and their centrally acting muscle relaxant activities were evaluated for an inhibitory effect on the flexor reflex in rats. The structure-activity relationships are discussed. In this series, 2-methyl-3-pyrrolidino-1-(4-trifluoromethylphenyl)-propan-1-one (28) showed significant centrally acting muscle relaxant activity. In addition, the activities of each enantiomer (28-(S) and (R)) were studied along with their acute toxicities. Compound 28-(R) was found to exhibit more potent activity and weaker acute toxicity than 28-(S). Accordingly, compound 28-(R) (NK433) is under development as a novel centrally acting muscle relaxant.
Preparation of aryl esters
申请人:DU PONT
公开号:US02467206A1
公开(公告)日:1949-04-12
Sen; Tiwari, Journal of the Indian Chemical Society, 1952, vol. 29, p. 419,421,423