Processes for the preparation of pesticidal compounds

A process comprising:

• (a) halogenating and reducing 4-nitropyrazole to produce
• 3-chloro-1H-pyrazol-4-amine hydrochloride (1a)
• with concentrated hydrochloric acid at a temperature between about 10° C. and about 20° C. with between about 1 and about 4 equivalents of triethylsilane and about 1 to 10 weight percent palladium on alumina;
• (b) mono-acylating 3-chloro-1H-pyrazol-4-amine hydrochloride (1a) with acetic anhydride in the presence of a base to yield
• (c) reacting 1(b) with a suitable halopyridine in the presence of a copper salt, an amine, and a base, to yield N-(3-chloro-1-(pyridin-3-yl)-1H-pyrazol-4-yl)acetamide (1c)
• (d) reacting 1(c) with a suitable reducing agent in the presence of an acid to yield 3-chloro-N-ethyl-1-(pyridin-3-yl)-1H-pyrazol-amine (1d)
• (e) reacting 1(d) with a suitable activated carboxylic acid, carboxylic acid anhydride, or acid chloride of a carboxylic acid to yield thioether (1e)
• wherein, R1 is selected form the group consisting of C1-C4 haloalkyl and C1-C4 alkyl-C3-C6 halocycloalkyl.