Synthesis and reactivity of compounds with cyclobutane ring(s). 11. [2 + 2] Cycloadditions of tetraalkoxyethylenes with ketenes: a general route to 2-substituted 1-hydroxycyclobut-1-ene-3,4-diones
Synthesis and reactivity of compounds with cyclobutane ring(s). 11. [2 + 2] Cycloadditions of tetraalkoxyethylenes with ketenes: a general route to 2-substituted 1-hydroxycyclobut-1-ene-3,4-diones