This paper presents a character table of S<sub>4</sub> wr S<sub>2</sub> wreathproduct group.Using this character table,<sup>1</sup>H or <sup>13</sup>C NMR spect
Cyclopropanedicarboxylic anhydride can be converted to 4-substituted (or 4-spiro-)3-oxabicyclo[3.1.0]hexan-2-one by addition of Grignard (or α,ω-di-Crignard)