Stereoelectronic control in ring opening of bridge-head nitrogen containing fused azolium salts
作者:András Messner、György Hajós、Géza Tímári
DOI:10.1016/s0040-4020(01)86593-5
日期:1992.9
Reaction of tetrazolopyridinium salts 1 with nucleophiles proceeds through the neutral intermediate 2. Ringopening of this leads to hetarylbutadienes (3,4,5) of different geometries. Experimental support has been provided for the theoretical supposition that 2 before opening up can undergo nitrogen inversion and the two invertomers of this intermediate (2A and 2B) react via the two possible senses
The stereochemistry and mechanism of the ring opening reaction of 3-aryltetrazolopyridinium salts and their v-triazolo analogues
作者:A. Gelléri、A. Messmer、S. Nagy、L. Radics
DOI:10.1016/s0040-4039(01)85587-8
日期:1980.1
Contrary to earlier reports, the title reaction was found to yield both 1E and 1Z configured dienic products predicted for a disrotatory process. A novel degradation giving, via the loss of one carbon unit, tetrazolyl- and triazolyl-acrolein was also observed.