Efficient helicene synthesis: Friedel-Crafts-type cyclization of 1,1-difluoro-1-alkenes.
Ichikawa
Junji
J
Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan. junji@chem.tsukuba.ac.jp
Yokota
Misaki
M
Kudo
Takao
T
Umezaki
Satoshi
S