Abstract
C-Alkyl-bis-phosphoryl chelating systems for the potential recovery of strategic metals
Highlights
Bisphosphonates (BPs) were introduced first in 1865 by Nikolay Menshutkin, a Russian scientist from Saint Petersburg State University.[1]
At the end of the reaction, the 31P NMR spectrum indicated that fairly large amounts of by-products were formed, most of which was a byproduct of the Arbuzov reaction, diethyl ethylphosphonate (69%)
The chemical shifts are expressed in parts per million referenced to residual chloroform-d1 (CDCl3, 7.27 ppm), DMSO-d6 ((CD3)2SO, 2.50 ppm), D2O (4.79 ppm), methanol-d4 (CD3OD, 3.31 ppm) or acetonitrile-d3 (CD3CN, 1.94 ppm)
Summary
Bisphosphonates (BPs) were introduced first in 1865 by Nikolay Menshutkin, a Russian scientist from Saint Petersburg State University.[1]. Scheme 1: Tetraethyl methylene bis(phosphonate) synthesis by direct double Arbuzov reaction. Tetraethyl methylene bis(phosphonate), synthesis by double Michaelis-Becker reaction on dichloromethane.
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