Table 4. Influence of Concentration and Diphenyl Sulfoxide Equivalence on the Coupling of Donor 3 with Diacetone Galactopyranose 31.

entry	[donor] (M)	[acceptor] (M)	[Ph2SO] (M)	[Tf2O] (M)	[TTBP] (M)	36, %yield	36, α/β ratio
1a	0.05	0.05	0.05	0.05	0.075	65%	α only
2b	0.10	0.083	0.20	0.15	0.20	45%	α/β = 1.2:1
3	0.10	0.083	0.10	0.15	0.20	42%	α/β = 1:1
4	0.05	0.05	0.10	0.05	0.075	51%	α/β = 3.2:1

^aReproduced from Table 2, entry 3 for ease of comparison.

^bConditions reported previously.²⁵