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- W2078902026 abstract "Non stabilized α-lithio-α-substituted alkanephosphonates (RO)2P(O)CHR1Li (R1 = H, alkyl, C1) are commonly used as phosphonoalkylating agents. The strength of the conjugated acids (RO)2P(O)CH2R1 is estimated by concurrent metallation. The data checked range from phenylacetylene to toluene in relation with the inductive electronic effects of R and R1. Most of the α-phosphonyl carbanions give stable dimers via thermal self-condensation which is steric (R) and electronic (R1) effects dependent. In addition preparative conditions for some phosphonate precursors are reexamined. Les carbanions phosphonates α-lithiés α-substitués non stabilisés (RO)2P(O)CHR1Li (R1 = H, alkyle, Cl) sont des agents de phosphonoalkylation fréquemment utilisés. Nous èvaluons la force des acides conjugués (RO)2P(O)CH2R1 par métallation compétitive; elle s'étend du phénylacétylène au toluène, en fonction des effets électroniques inductifs de R et R1. Ces carbanions subissent dans leur grande majorité une autocondensation thermique en dimères stables qui est liée essentiellement à l'encombrement stérique de R et à la nature de R1. Cette étude est complét'e par une mise au point sur la préparation de quelques phosphonates précurseurs." @default.
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- W2078902026 date "1986-10-01" @default.
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- W2078902026 title "Carbanions phosphonates α-lithiés: synthèse, basicité comparée et stabilité à l'autocondensation" @default.
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- W2078902026 doi "https://doi.org/10.1016/0022-328x(86)80314-x" @default.
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