翻訳と辞書 Words near each other ・ Methylenedioxymethoxyethylamphetamine ・ Methylenedioxymethylphenethylamine ・ Methylenedioxyphenethylamine ・ Methylenedioxyphentermine ・ Methylenedioxyphenylpropanone ・ Methylenedioxyphenylpropene ・ Methylenedioxypropargylamphetamine ・ Methylenedioxypyrovalerone ・ Methylenediurea deaminase ・ Methylenetetrahydrofolate dehydrogenase (NAD+) ・ Methylenetetrahydrofolate dehydrogenase (NADP+) ・ Methylenetetrahydrofolate reductase ・ Methylenetetrahydrofolate reductase (ferredoxin) ・ Methylenetetrahydrofolate—tRNA-(uracil-5-)-methyltransferase ・ Methylenetetrahydromethanopterin dehydrogenase ・ Methylenetriphenylphosphorane ・ Methylenolactocin ・ Methylenomycin ・ Methylenomycin A ・ Methylenomycin B ・ Methylephedrine ・ Methylergometrine ・ Methylestrenolone ・ Methylethyl ketone oxime ・ Methylethyltryptamine ・ Methylfentanyl ・ Methylfuran ・ Methylglucoside ・ Methylglutaconyl-CoA hydratase ・ Methylglutamate dehydrogenase Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Methylenetriphenylphosphorane ： ウィキペディア英語版 Methylenetriphenylphosphorane |Section2= |Section7= }} Methylenetriphenylphosphorane is an organophosphorus compound with the formula Ph3PCH2. It is the parent member of the phosphorus ylides, popularly known as Wittig reagents. It is a highly polar, highly basic species. ==Preparation and use== Methylenetriphenylphosphorane is prepared from triphenylphosphine and methyl bromide followed by deprotonation of the resulting phosphonium salt using a strong base like butyllithium: :Ph3PCH3Br + BuLi → Ph3PCH2 + LiBr + BuH The compound is generally not isolated, instead it is used in situ. Methylenetriphenylphosphorane is used to replace oxygen centres in aldehydes and ketones with a methylene group: :R2CO + Ph3PCH2 → R2C=CH2 + Ph3PO The phosphorus-containing product is triphenylphosphine oxide. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Methylenetriphenylphosphorane」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.