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.
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