The reaction of 2-methylbenzenethiol with 2 equiv of BuLi followed by (i-Pr) 2 NBCl 2 affords 2,3-dihydro-2-(diisopropylamino)-1,2-benzothiaborole ( 10 ), which can be deprotonated by t-BuLi to form lithium 2-(diisopropylamino)-1,2-benzothiaborolide ( 3 ). The benzothiaborolide was converted to the Cp*ZrCl 2 complex 11 and the Cp*Ru complex 12, in which the thiaborolide ring is η 5 -coordinated to Ru.
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Ashe et al. (2000) studied this question.
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