Structures of Addition Products of Acetylenedicarboxylic Acid Esters with Various Dinucleophiles. An application of C, H-spin-coupling constants
作者:Ulrich Vögeli、Wolfgang von Philipsborn、Kuppuswamy Nagarajan、Mohan D. Nair
DOI:10.1002/hlca.19780610207
日期:1978.3.8
Heterocyclic compounds obtained by addition of acetylenedicarboxylicacidesters to thioureas, cyclic amidines and o-difunctionalized aromatic systems have been studied by 13C-NMR. In particular, C, H-spin-coupling constants over two and three bonds were used to differentiate between the various constitutional isomers and to establish the configuration of trisubstituted exocyclic C, C-double bonds
Acetylenic esters. Part III. Reactions of thiocarbonyl compounds with methyl propiolate, methyl methylpropiolate, and methyl phenylpropiolate
作者:G. Dallas、J. W. Lown、J. C. N. Ma
DOI:10.1039/j39680002510
日期:——
Non-terminal acetylenic esters react with many thiocarbonyl compounds to form heterocycles or 1 : 1 addition products. Propiolic esters in most cases form isomeric mixtures of dimethyl 3,3′-thiodiacrylates (I). The stereochemical course of the thiolic nucleophilic additions may be controlled for preparative purposes by changes in solvent polarity. All three stereoisomers of (I) have been prepared.