Table 1.

Acceptorless dehydrogenation of 1,2,3,4-tetrahydroquinoline (1a)

Entry	Catalyst	Conversion (%)a	Yield (%)a
1	Fe-Phenb	Trace	Trace
2	Fe-Phen@EGOc	20	16
3	Fe@EGO	17	15
4	Phen@EGO	6	Trace
5	Fe-L1@EGO-400	40	37
6	Fe-L1@EGO-600	52	45d
7	Fe-L1@EGO-900	98	92 (88)d
8	Fe-L2@EGO-900	51	40
9	Fe-L3@EGO-900	30	22
10	—	0	0
11	Fe-L1@Al2O3-900	23	19
12	Fe-L1@SiO2-900	15	11
13	Fe-L1@CeO2-900	8	Trace
14	Fe-L1@TiO2-900	27	16

Reaction conditions: 1a (0.5 mmol), cat. Fe-L₁@EGO-900 (8 mol%), t-BuOK (10 mol%), and mesitylene (2 mL) heated at 145 °C

^aYields of 2a and conversion of 1a were determined by gas chromatography (GC)

^bReaction under homogeneous conditions using the in situ-generated Fe catalyst

^cNon-pyrolyzed materials

^dIsolated yield