Spielman, M. A. published the artcileMesitylmagnesium bromide as a reagent in the acetoacetic ester condensation, SDS of cas: 5340-78-3, the publication is Journal of the American Chemical Society (1937), 2009-10, database is CAplus.
Et isovalerate (I), Et tert-butylacetate (II) and Et isobutyrate (III), 3 esters which do not undergo the acetoacetic ester type of condensation with EtONa, do so with mesitylmagnesium bromide (IV). Since the resulting β-keto esters give no color with FeCl3, their failure to be formed in the presence of EtONa is attributed to their inability to enolize as do ordinary β-keto esters. I (24 g.) in 2 volumes Et2O and 0.189 mole of IV in 170 cc. Et2O give 10 g. (51%) of Et α-isovalerylisovalerate, b32 128-33°; if the ester is added to the IV, the yield is substantially the same, but the product is more difficult to purify; iso-PrMgBr gave 1.2% yields. II (27 g.) and 0.194 mole of IV give 32% of Et α,γ-di-tert-butylacetoacetate, b32 138-40°, nD25 1.4389; hydrolysis at 200° with 8% KOH in 50% EtOH yields dineopentyl ketone, b740 185°, nD25 1.4210; semicarbazone, m. 178-9°. III gives 26.5% of Et tetramethylacetoacetate, b33, 105-9°. Et stearate gives 27% of Et α-stearylstearate, m. 48-9°.
Journal of the American Chemical Society published new progress about 5340-78-3. 5340-78-3 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is Ethyltert-butylacetate, and the molecular formula is C6H12N2O, SDS of cas: 5340-78-3.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics