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2. Methyl group - Wikipedia

   en.wikipedia.org/wiki/Methyl_group

   In organic chemistry, a methyl group is an alkyl derived from methane, containing one carbon atom bonded to three hydrogen atoms, having chemical formula CH 3 (whereas normal methane has the formula CH 4). In formulas, the group is often abbreviated as Me. This hydrocarbon group occurs in many organic compounds. It is a very stable group in ...

3. Miter saw - Wikipedia

   en.wikipedia.org/wiki/Miter_saw

   A motorized miter saw. A miter saw or mitre saw is a saw used to make accurate crosscuts and miters in a workpiece by positioning a mounted blade onto a board. A miter saw in its earliest form was composed of a back saw in a miter box, but in modern implementation consists of a powered circular saw that can be positioned at a variety of angles and lowered onto a board positioned against a ...

4. 3-(Difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylic acid ...

   en.wikipedia.org/wiki/3-(Difluoromethyl)-1...

   The first reported synthesis of the pyrazole acid was in 1993, by chemists at Monsanto. [7]The ethyl ester of difluoroacetoacetic acid is treated with triethyl orthoformate in the presence of acetic anhydride [8] and then with methyl hydrazine, which forms mainly the required pyrazole ring, in addition to its isomer with the methyl group on the alternative nitrogen atom.

5. Gilman reagent - Wikipedia

   en.wikipedia.org/wiki/Gilman_reagent

   A conjugated 1,4 addition using a Gilman reagent with an arbitrary R group. These reagents are useful because, unlike related Grignard reagents and organolithium reagents, they react with organic halides to replace the halide group with an R group (the Corey–House reaction). Such displacement reactions allow for the synthesis of complex ...

6. Trimethylsilyl chloride - Wikipedia

   en.wikipedia.org/wiki/Trimethylsilyl_chloride

   TMSCl is reactive toward nucleophiles, resulting in the replacement of the chloride. In a characteristic reaction of TMSCl, the nucleophile is water, resulting in hydrolysis to give the hexamethyldisiloxane: + + The related reaction of trimethylsilyl chloride with alcohols can be exploited to produce anhydrous solutions of hydrochloric acid in alcohols, which find use in the mild synthesis of ...

7. Combination square - Wikipedia

   en.wikipedia.org/wiki/Combination_square

   [1] [2] Other names for the tool include adjustable square, combo square, and sliding square. The most common head is the standard head, which is used as a square for marking and testing 90° and 45° angles. [3] The other common types of head are the protractor head, and the centre finder head. [4]