(RS)-6-ethyl 2-carboxy-1,2,3,4-tetrahydroazulene-6-carboxylate.
The title compound, C(14)H(16)O(4), was obtained during the synthesis of 2,6-disubstituted azulene derivatives. In the partially reduced azulene skeleton, the absence of a H atom at the ester substitutent position of the seven-membered ring, as well as lengthened double bonds, indicate a conjugative stabilized system with two overlaid tautomers.
Hussain
Zakir
Z
Institut für Organische Chemie, TU Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany.
Oeser
Thomas
T
Hopf
Henning
H