Table 2. Scope for the ring expansion of 8-alkyl benzocyclobutenones ^a .

^aAll yields are isolated yields, and the numbers in parenthesis are yields based on recovered starting material. All reactions were carried out in a sealed vial under N₂ atmosphere.

^bThe reaction was run at 110 °C for 48 h.

^cThe reaction was run at 150 °C for 48 h.

^dThe reaction was run at 130 °C for 48 h.