Table 1 Optimization of (NHC)Pd(II) catalyzed transfer-dehydroaromatization (TDHA)

^aStandard condition: substrate 1a (0.25 mmol) and regulator R (0.5 mmol) were added to NHC L/PdCl₂ (0.025 mmol) with HSi(OEt)₃ (0.0375 mmol) in 2 mL THF at r.t. and stirred for 24 hrs. The conversion of 1a and selectivity and yield of product 2a were determined by ¹H NMR.
^bUnder O₂ instead of N₂.
^cNo HSi(OEt)₃.
^d~50% benzene based on R5.
^eHBpin was used instead of silane.
^fNo HBpin or silane was used.
n.d. not determined.

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