9-METHTLENETRICYCLO[4.3.1.0]DECA-2,4,7-TRIEEE DERIVATIVES

9-Methylenetricyclo[4.3.1.0]deca-2,4,7-triene (3a) and its derivatives possessing electron releasing group such as bis(dimethylamino)- and bis(methylthio)-groups at the exo-methylene carbon atom (3b and 3c) were synthesized from bicyclo[4.3.1]decatetraenyl anion (2). It has been shown that the closed norcaradiene tautomers (3a, 3b and 3c) are preferable to the opened nonafulvene tautomers (4a, 4b, and 4c).