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PubMed:16084504 JSONTXT

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sentences

Id Subject Object Predicate Lexical cue
TextSentencer_T1 0-169 Sentence denotes Regioselective synthesis of long-chain ethers and their sulfates derived from methyl beta-D-galactopyranoside and derivatives via dibutylstannylene acetal intermediates.
TextSentencer_T2 170-387 Sentence denotes A number of different conditions were investigated for the alkylation of the dibutylstannylene acetals of methyl beta-d-galactopyranoside with long-chain primary alkyl bromides, decyl, dodecyl, and tetradecyl bromide.
TextSentencer_T3 388-645 Sentence denotes The best yields of the major products, the 3-O-alkyl ethers, were obtained by reaction of the alkyl bromide with the monodibutylstannylene acetal in DMF in the presence of cesium fluoride for extended periods of time at moderate temperatures (65 degrees C).
TextSentencer_T4 646-735 Sentence denotes These products were always accompanied by minor amounts of the 3,6-di-O-alkyl derivative.
TextSentencer_T5 736-957 Sentence denotes Performing the reaction with excess alkyl halide on the bis(dibutylstannylene) acetal resulted in more of the 3,6-di-O-alkyl derivative, particularly for the shorter alkyl bromides, but this product was never predominant.
TextSentencer_T6 958-1089 Sentence denotes Sulfation of the dibutylstannylene acetal of methyl 3-O-tetradecyl-beta-D-galactopyranoside resulted in the 6-sulfate in 96% yield.
T1 0-169 Sentence denotes Regioselective synthesis of long-chain ethers and their sulfates derived from methyl beta-D-galactopyranoside and derivatives via dibutylstannylene acetal intermediates.
T2 170-387 Sentence denotes A number of different conditions were investigated for the alkylation of the dibutylstannylene acetals of methyl beta-d-galactopyranoside with long-chain primary alkyl bromides, decyl, dodecyl, and tetradecyl bromide.
T3 388-645 Sentence denotes The best yields of the major products, the 3-O-alkyl ethers, were obtained by reaction of the alkyl bromide with the monodibutylstannylene acetal in DMF in the presence of cesium fluoride for extended periods of time at moderate temperatures (65 degrees C).
T4 646-735 Sentence denotes These products were always accompanied by minor amounts of the 3,6-di-O-alkyl derivative.
T5 736-957 Sentence denotes Performing the reaction with excess alkyl halide on the bis(dibutylstannylene) acetal resulted in more of the 3,6-di-O-alkyl derivative, particularly for the shorter alkyl bromides, but this product was never predominant.
T6 958-1089 Sentence denotes Sulfation of the dibutylstannylene acetal of methyl 3-O-tetradecyl-beta-D-galactopyranoside resulted in the 6-sulfate in 96% yield.