Starting from the thiacalix[4]arene tetraacetate, novel derivatives bearing four ureido or thioureido functions on the lower rim have been prepared. As proven by NMR titrations, these compounds can bind anions via hydrogen bonding interactions and represent the first example of anion receptors in the thiacalixarene series. (C) 2004 Elsevier Ltd. All rights reserved.
Reactions of Diamines with Isocyanates and Isothiocyanates
作者:OLIVER STOUTLAND、LON HELGEN、COURTLAND L. AGRE
DOI:10.1021/jo01088a022
日期:1959.6
Reaction Discovery by Using a Sandwich Immunoassay
Mmm, a reaction sandwich…︁ Using an immunoassay‐based technique able to monitor any kind of cross‐coupling reaction, a systematic and rapid evaluation of a large panel of random reactions was carried out. This approach led to the discovery of two new copper‐promoted reactions: a desulfurization reaction of thioureas leading to isoureas and a cyclization reaction leading to thiazole derivatives from