Cyclopentadienyl Ruthenium(II) Complex-Mediated Oxidation of Benzylic and Allylic Alcohols to Corresponding Aldehydes

Table 2

Oxidation results of alcohols with RuCpCl(PPh₃)₂ at reflux in anhydrous THF solution.

Entry	Alcohols 1b–k		Reaction time (h)	Yields of products 2b–k		Yields (%)
1	1b		∼48 h	2b		73
2	1c		∼48 h	2c		80
3	1d		∼48 h	2d		68
4	1e		∼48 h	2e		82
5	1f		∼48 h	2f		86
6	1g		∼48 h	2g		68
7	1h		∼48 h	2h		69
8	1i		∼48 h	2i		17^a
9	1j	CH3(CH2)5CH2OH	∼48 h	2j	CH3(CH2)5CHO	35
10	1k		∼48 h	2k	—	—^a

^aThe starting material was recovered.