Dimethyl propylphosphonate

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Dimethyl Propylphosphonate (DMPP) [18755-43-6]. This liquid additive was recently introduced by Bayer as LEVAGARD DMRR, an alternative to the chloroalkyl phosphates for flame-retarding rigid polyurethane foams. 

This reaction has been modified by Ohira and Bestmann via the generation of dimethyl(diazomethyl)phosphonate in situ by the treatment of dimethyl-l-diazo-2-oxo-propylphosphonate with methanol and K2CO3. This method, often gives a very high yield of terminal alkynes from aldehydes and is also known as the Bestmann modification. Dimethyl-l-diazo-2-oxopropylphosphonate is referred to as Ohira s reagent. ... 

A diastereomeric mixture of dimethyl 2-formyl-2-methyl-l-phenylcyclo-propylphosphonates (Z)-757a and ( )-757b was obtained by a thermally induced reaction of cyclopropanation of a-methylacrolein (756) with a-diazobenzylphosphonate (755). The reaction the Z/E mixture with a-aminoacids methyl esters (758) gave cyclopropylaldimines, which after reductive amination as the key step, afforded the corresponding iV-substituted 2-aminomethyl-cyclopropylphosphonates (759a-b) (Scheme 192). " ... 

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