Dibromo methyl ester

Cyclopropane, 1,1 -dibromo-2,2-diplienyl-[Benzene, l,l -(2,2-dibromocyclo-propylidene)bis-], 32 Cyclopropanecarboxyltc acid, 70 Cydopropanes, gem-dihalo, 32 CYCLOUNDECANONE, 107 Cycloundecanone, 2-hydroxy-, 110 Cycloundecene, 1-carboxy- [1-Cyclo-undecene-1-carboxylic acid], 111 Cycloundecene, 1-methoxy-, 111 1-Cycloundecene-l-carboxyhc acid, methyl ester, 108... 

Dibromo-2,4-dideoxy-tetronic acid methyl esters... 

Fig. 1.31. The Wohl-Ziegler bromination of crotonic acid methyl ester D exclusively supplies the bromocrotonic ester G. However, vinyl acetic acid ester C and NBS exclusively yield the dibromo addition product B under Wohl-Ziegler conditions. Here, NBS acts as a Br2 source for addition rather than substitution. The fact that vinyl acetic acid ester and NBS do not react likewise to yield the bromocrotonic ester G is due to an electronic effect discussed in the text.

Aryl ortho thioesters, which can be readily prepared from the corresponding acid chlorides or methyl esters, react with A-halo compounds, such as 1,3-dibromo-5,5-dimethylhydantoin (DBH) or A-bromosuccinimide, and hydrogen fluoridc/pyridine to give aromatic trifluoromethyl compounds,i.e. formation of... 

The action of a Zn/Cu couple on 1,3-dibromo ketones and secondary amides yields 2-dialkylamino-1,3-dioxolanes (451 equation 208). Fluorosulfonic peracid anhydride adds to trifluoroacetonitrile to give an amide acetal (452 equation 209). In the addition of (Z)-2-butene-l,4-diol to trichloroacetoni-trile, catalyzed by sodium, the 1,3-dioxepin (453 equation 210) is produced. Bicyclic amide acetals (454 equation 211) are byproducts in the reaction of lactim ethers with diketene. TTie methyl esters of perfluorinated carboxylic acids react with diethanolamine to afford bicyclic amide acetals (455 equation 212). Heating of maleic anilides (456 equation 213) with acetic acid anhydride/sodium acetate gives heterocyclic compounds (457) containing an amide acetal structure. ... 

Abramov, V.S., and ITina, N.A., Mechanism of the Arbuzov rearrangement. Part 3. Reaction of the nitrile and methyl ester of a,P-dibromo- and a,P-dichloropropionic acids with phosphites, Zh. Obshch. Khim., 26, 2014, 1956 Chem. Abstr., 51, 1822c, 1957. 

It is useful to be aware that diisopropyl esters of phosphonic acids carrying additional functional groups can be dealkylated highly chemoselectively by Me3SiBr in dioxane at 60 A three-step sequence has been devised for the regioselective dealkylation of tetraalkyl esters of dichloro- and dibromo-methyl-enebis(phosphonic) acids to leave the P,P-dialkyl esters. ... 

Benzenesulfonamide, Ar,AT-dibromo-4-methyl-(TsNBr2) bromohydrination with, 287 Benzenesulfonamides reductive cleavage, 247 synthesis of drugs, 301, 307-308 Benzenesulfonic acids. See Sulfonic acids Benzenesulfonic acid, 4-methyl-, esters (tosylates) alkyl a-synthons, 16, 24, 47, 93 fragmentation of, 89 rearrangement of, 32 reductive cleavage of, 114, 202-203 —, 4-methyl-, hydrazide (tosylhydrazine) hydrazones of fragmentation, 89 reduction, 109... 

C2 5H3 6O4, 3,20-Bis(ethylenedioxy)-pregna-5,7-diene, 39B, 390 C25H3sBr203, 11/3,12a-Dibromo-3a,9-oxidocholanic acid methyl ester, 34B, 300... 

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