X-Ray Crystallographic Structures of 9-Methyl-3-oxa-2,6,8-triphenyl-5-azatricyclo[4,2,1,02,6]non-7-ene 6-Hydroxy-1,6,7-triphenylazabicyclo[3,3,0]octa-2,7-diene and 6-Hydroxy-4-methyl-1,6,7-triphenylazabicyclo[3,3,0]oct-7-ene: Products Formed by Rearrangements of N-Vinylpyridinium Pseudobases