Photochromism of Dihydroindolizines Part XI: Synthesis of Novel Carbon-Rich Photochromic Dihydroindolizines-Based Potential Electronic Devices

Scheme 1

The synthesis of dimethyl 2^′,7^′-diethynylspiro[cycloprop[2]ene-1,9^′-fluorene]-2,3-dicarboxylate precursor 6.