17O NMR Spectra of Acylated Ureas and Thioureas

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Title:17O NMR Spectra of Acylated Ureas and Thioureas
Creators:
Jirman, Josef
Pech, Pavel
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 57, 6, pp. 1278-1281

Abstract

<sup>17</sup>O NMR spectra of ten acyl- and diacylureas (<i>I-V</i>) and thioureas (<i>VII-X</i>) were measured. <sup>17</sup>O NMR chemical shifts of the ureido oxygen in the ureas range from 240 to 310 ppm, those of the acyl oxygens from 377 to 400 ppm (acetyl groups) and 359 to 389 ppm (benzoyl groups), the half-widths being tens to hundreds Hz. Acylation of urea to the diacyl stage has an almost twice as large effect on the chemical shift of the ureido oxygen than has the monoacylation. From the viewpoint of <sup>17</sup>O NMR shifts, no significant differences has been found in the influence of ureido and thioureido groups on the transfer of electronic effects in 1,3-diacylureas and 1,3-diacylthioureas.

Title:17O NMR Spectra of Acylated Ureas and Thioureas
Creators:
Jirman, Josef
Pech, Pavel
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:57
Number:6
Page Range:pp. 1278-1281
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19921278UNSPECIFIED
ID Code:105
Item Type:Article
Deposited On:06 Feb 2009 16:39
Last Modified:06 Feb 2009 15:40

Citation

Jirman, Josef; Pech, Pavel (1992) 17O NMR Spectra of Acylated Ureas and Thioureas. Collection of Czechoslovak Chemical Communications, 57 (6). pp. 1278-1281. ISSN 0010-0765

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