Wet Silica-Supported Permanganate for the Cleavage of Semicarbazones and Phenylhydrazones under Solvent-Free Conditions
摘要:
Wet silica-supported potassium permanganate was used as an inexpensive and efficient reagent for conversion of semicarbazones and phenylhydrazones to the corresponding carbonyl compounds under solid-state conditions.
Union presence and executive compensation: An exploratory study
作者:Parbudyal Singh、Naresh C. Agarwal
DOI:10.1007/s12122-002-1032-4
日期:2002.12
While executive compensation has historically attracted considerable attention and controversy, this issue is becoming increasingly more contentious as organizations attempt to cut labor costs through reengineering and downsizing. Unions, governments, and workers are becoming critical of seemingly excessive executive compensation while employees are asked to make concessions. In fact, many labor organizations are specif-ically targeting executive compensation for criticisms: Witness their web sites tracking executive pay and numerous press releases and public statements. However, do unions, through their presence in a firm, affect executive compensation? While there is con-siderable research on the determinants and correlates of executive compensation, the literature is silent on the role of unions. We investigate the distinctive effects of union presence with data on a sample of Canadianbased metalmining firms. The differences between union and nonunion firms, as well as the unique effects of union presence, are analyzed and future research suggested.
The 13C, 15N and 77Se NMR data (chemical shifts and coupling constants) of some cycloakeno‐1,2,3‐selenadiazoles are presented. Extremely large 77Se chemical shifts are found. 15N, 77Se coupling constants, obtained at natural abundance, are reported for the first time. Strong signal shifts due to different sizes of the cycloakeno rings can be qualitatively rationalized in terms of electron transfer
Interrupted Dance of Five Heteroatoms: Reinventing Ozonolysis to Make Geminal Alkoxyhydroperoxides from C═N Bonds
作者:Ivan A. Yaremenko、Dmitri I. Fomenkov、Roman A. Budekhin、Peter S. Radulov、Michael G. Medvedev、Nikolai V. Krivoshchapov、Liang-Nian He、Igor V. Alabugin、Alexander O. Terent’ev
DOI:10.1021/acs.joc.4c00233
日期:2024.4.19
Four heteroatoms dance in the cascade of four pericyclic reactions initiated by ozonolysis of C═N bonds. Switching from imines to semicarbazones introduces the fifth heteroatom that slows this dance, delays reaching the thermodynamically favorable escape path, and allows efficient interception of carbonyl oxides (Criegee intermediates, CIs) by an external nucleophile. The new three-component reaction