Screening studies for nonclassical Corey–Chaykovsky ring-closing reaction^a.

Entry	Base	Global yield [ratio 22(a+b)b : 22c]
1	KOH (2.0 equiv.)	95% [76 : 24]
2	KOH (1.0 equiv.)	83% [82 : 18]
3	K2CO3 (1.2 equiv.)	97% [100 : 0]

^aAll reactions were performed in CH₃CN : MeOH (9 : 1), for 4 hours at room temperature.

^b22(a+b) was obtained in a 73 : 27 dr.