3466-00-0Relevant articles and documents
Efficient one-pot synthesis of secondary cyclic phosphanes with easy regeneration of the phosphorus-donor reagent used
Baccolini, Graziano,Boga, Carla,Galeotti, Matteo
, p. 3058 - 3060 (2004)
Phosphanes: No pain, all gain. A regenerable phosphorus donor is the key to an efficient and economic one-pot synthesis of five- and six-membered secondary cyclic phosphanes. The reaction, at room temperature, of 1 with 1 equivalent of bis(Grignard reagent) 2 followed by treatment with aqueous acid gives cyclic phosphanes 3 in 70-80% yield and the new compound 4. Simply treating 4 with PCl3 quantitatively regenerates the starting reagent 1, which can be reused without further purification.
Flash vacuum pyrolysis of dichlorophosphines over magnesium: Generation and reactivity of simple phosphinidenes
Aitken, R. Alan,Masamba, Wayiza,Wilson, Neil J.
, p. 8417 - 8420 (2007/10/03)
Flash vacuum pyrolysis of dichlorophosphines over magnesium at 500-600 °C gives the products expected from intramolecular CH insertion of the corresponding phosphinidenes.
Process for preparing cyclic phosphinic acid esters
-
, (2008/06/13)
Process for preparing cyclic phosphinic acid esters of the formula (I) STR1 wherein R1 is an alkyl radical having up to 18 carbon atoms or a phenyl radical being optionally substituted by alkyl, halogen or alkylated amino groups, R2 stands for a hydrogen atom or has the same meaning as R1 and n is 1 or 2, which comprises reacting phosphinic acid monoesters of the formula (II) STR2 wherein R3 is an alkyl radical having up to 8 carbon atoms optionally substituted by chlorine atoms and R1 has the meaning given above, with an alkenol of the formula (III) STR3 wherein R2 and n have the aforesaid meaning, in the presence of catalytic quantities of free radical forming agents, splitting off the alcohol of formula (IV) simultaneously or subsequently and separating the reaction products, preferably by distillation.
