Morphology-Dependent Ullmann C-O Arylation Using Cu₂O Nanocrystals

Table 3

Catalytic performance of the five different Cu-oxide nanocrystals as catalysts for the Ullmann C-O crosscoupling of phenol with aryl halides.

	Cu-oxide nanocrystal	Atmosphere	Base	Aryl halide	% conversion	Cu^I 2p3/2 (eV)	(eV)	Mean (nm)
1	Oct	Air	t-BuOK	I-Ph	48	933.0	2.11	864
2	Oct	Air	Cs2CO3	I-Ph	54	933.0	2.11	864
3	Oct	Ar	Cs2CO3	Cl-Ph	8	933.0	2.11	864
4	Oct	Ar	Cs2CO3	Br-Ph	16	933.0	2.11	864
5	Oct	Ar	Cs2CO3	I-Ph	69	933.0	2.11	864
6	PC	Ar	Cs2CO3	I-Ph	79	932.9	2.13	701
7	RD	Ar	Cs2CO3	I-Ph	63	933.0	2.14	411
8	TC	Ar	Cs2CO3	I-Ph	85	932.7	2.07	834
9	FS	Ar	Cs2CO3	I-Ph	91	932.2	2.04	427