TiO₂ Nanoparticles-Photocatalytic Oxidation of Selected Cycloalkanols

Table 1

Photocatalytic oxidation of the investigated cyclalkanols 1–3.

Exp.	Substrate	Solvents	Time (hrs)	Conv. (%)	Products (No, yield%)
1	Cyclohexanol (1)	C${\text{H}}_3$CN	20	71.6	Cyclohexanone (4, 45.6), 1,4-Cyclohexanedione (7, 3.2), Cyclohexyl formate (8, 2.5), 2-Cyclohexenone (9, 1.8), 2-Hydroxycyclohexanone (10, 1.1) n-Hexanoic acid (11, 4.0), Cyclohexyl hexanoate (12, 3.0), 5-Hexenal (16, 2.9), 4-Hydroxycyclohexanone (17, 4.4), Other product (19, 2.9).
2	Cyclohexanol (1)	C${\text{H}}_3$CN+${\text{H}}_2$O (4?:?1)	20	74.3	Cyclohexanone (4, 39.7), 1,4-Cyclohexadione (7, 3.7), Cyclohexyl formate (8, 1.4), 2-Cyclohexenone (9, 2.4), 2-Hydroxycyclohexanone (10, 7.8), 5-Hexenal (16, 1.8), 4-Hydroxycyclohexanone (17, 11.0), 1,4-Cyclohexanediol (20, 6.5).
3	Cyclohexanol (1)	C${\text{H}}_3$CN+${\text{H}}_2$${\text{O}}_2$ (4?:?1)	20	98.0	Cyclohexanone (4, 13.6), 1,4-Cyclohexadione (7, 8.7), 2-Cyclohexenone (9, 5.1), 2-Hydroxycyclohexanone (10, 10.2), 4-Hydroxycyclohexanone (17, 10.5), 1,4-Cyclohexanediol (20, 8.2), Glutaric acid (21, 12.0), Adipic acid (22, 29.8).
4	Cyclohexanol (1)	${\text{H}}_3$CO${\text{H}}_3$	20	45	Cyclohexanone (4, 25.2), 1,4-Cyclohexadione (7, 3.4), Cyclohexyl formate (8, 2.3), 2-Hydroxycyclohexanone (10, 0.5) n-Hexanoic acid (11, 5.4), 5-Hexenal (16, 1.9), 4-Hydroxycyclohexanone (17, 3.5), 1,$1^{\text{'}}$-Bicyclohexyl-1,$1^{\text{'}}$-diol (18, 2.5).
5	Cyclopentanol (2)	C${\text{H}}_3$CN	20	94.2	Cyclopentanone (5, 72.7), n-Pentanoic acid (13, 4.3), Cyclopentyl pentanoate (14, 2.8), 4-Pentenal (23, 3.7), Other products (24, 3.1), (25, 5.8), (26, 1.8).
6	Cycloheptanol (3)	C${\text{H}}_3$CN	20	100	Cycloheptanone (6, 79.9), n-heptanoic acid (15, 3.2), 6-Heptenal (27, 1.8), 4-Hydroxycycloheptanone (28, 4.1), 1,4-Cycloheptadione (29, 4.7), 2-Hydroxycycloheptanone (30, 1.5).