Lawesson's reagent → N,N-Diethyl-3-fluorobenzenecarbothioamide

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Reaction Steps

A mixture of N,N-diethyl-3-fluorobenzamide (4.69 g, 24 mmol) (cf Mills, et al., "Directed Ortho Metalation of N,N-Diethylbenzamides. Silicon Protection of Ortho Sites and the o-Methyl Group," J. of Organic Chemistry 54: 4372-4385, 1989), Lawesson's reagent (6.47 g, 16 mmol) and xylenes (150 mL) was refluxed overnight, then was concentrated and kugelrohr distilled (105°-110° C. at 0.25 torr) to yield 4.8 g N,N-diethyl-3-(fluoro)thiobenzamide as a yellow oil, a 95% yield.

Provenance & Evidence