Table 1. Probing the importance of boron positioning and substitution on oxime condensations.

Entry	Ar	X	Product	Conc (µM)	Conv b (%)
1 c	Ph	H		100	<5
2		H		100	>98
3		H		10	>98
4		H		100	>98
5 c		H		100	<5
6 c		H		100	<5
7		Me		100	94
8		H		100	>98 d
9		Me		100	>98

^aTime is approximate since samples are injected directly after mixing.

^bDetermined by reverse phase HPLC analysis under neutral conditions.

^cInjections at 90 minutes still show <5% conversion.

^dAt the first injection approximately 10% of the pinacol ester oxime is observed, but only the hydrolysed product is detected at 90 minutes. KP_i = potassium phosphate buffer.