Sulfuric acid, chloro diethyl ester

Additional peaks and improved resolution of peaks were obtained after cleanup and column chromatography separations. The method of analysis is described by the flow diagram shown in Figure 3. An aliquot of the air-dried dust was slurried with water, adjusted to pH 3 with sulfuric acid, and then repeatedly extracted in a Waring blendor with a solvent mixture of hexane and diethyl ether, 1 + 1 (v./v.). A portion of the extract was used for herbicide analysis in which methylation with diazomethane and gas chromatography were employed for the detection of the methyl ester of the chloro-alkyl phenoxy compounds. 

The condensation of 4-chloro-2-methylphenol with sodium salt of hydroxyl diethyl ester in the presence of a dehydrating agent such as concentrated sulfuric acid gives spirodilactone. A plausible mechanism comprises a transesterification of the oxaloacetate ester and 4-chloro-2-methylphenol to afford the ketoester 44. Then intermediate 36 submits to an intramolecular condensation/dehydration to give 45, which could,... 

The ozonolysis reaction, followed by reductive workup with sulfur dioxide, as described in Part A of the present procedure, illustrates a general method which has been developed for the preparation of acetals. Application of the procedure is illustrated by conversion of the following olefins in alcoholic solution to the corresponding acetals (1) l-chloro-4-(o-nitrophenyl)-2-butene to o-nitrophenylacetaldehyde dimethyl acetal in 84% yield (2) l,4-dibromo-2-butene tobromoacetaldehyde dimethyl acetal in 67% yield (3) 3-butenoic acid to malonaldehydic acid diethyl acetal ethyl ester in 61% yield (4) cyclopentadiene to malonaldehyde bis(diethyl acetal) in 48% yield and (5)... 

---