Spiro oligothiophenes.
Linear oligothiophenes, containing annelated dithieno[2,3-b:3',2'-d]thiophene units, undergo unexpected spirocyclizations upon treatment with trifluoroacetic acid. The resultant spiro oligothiophenes possess novel structures in which the spiro or dispiro skeleton is within an all-thiophene/dihydrothiophene framework. Racemic dispiro octathiophene is obtained with high diastereoselectivity and in high yield.
Miyasaka
Makoto
M
Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, USA.
Pink
Maren
M
Rajca
Suchada
S
Rajca
Andrzej
A