21458-48-0Relevant academic research and scientific papers
Turn-on fluorescence sensor for mono- and di-phosphonic acid derivatives using anthracene-based diamidine and its detection of amidinium-phosphonate and amidinium formation
Kusukawa, Takahiro,Nagano, Hitoshi,Nakaguchi, Keita,Takeshita, Shota,Harumoto, Yuya
, p. 465 - 476 (2018)
The fluorescence detection of di-phosphonic acid and mono-phosphonic acid derivatives using the anthracene-based diamidine 1 has been investigated. The diamidine 1 forms 1:1 and 1:2 complexes with the di-phosphonic acid and mono-phosphonic acid derivative
Medium-ring diphosphines from diphosphabicycloalkanes: stereoselective syntheses, structure and properties
Alder, Roger W.,Ganter, Christian,Gil, Michelle,Gleiter, Rolf,Harris, Christopher J.,et al.
, p. 1643 - 1656 (2007/10/03)
A series of 1,k+2-diphosphabicycloalkanes 2b-e are prepared by n-BuLi-promoted cyclisation of 1,ω-diphosphinoalkanes, followed by alkylation and cycloalkylation with 1,ω-dihaloalkanes.These compounds appear to be exclusively cis-isomers except 1,6-diphosphabicycloundecane 2e which is a 3:1 cis/trans mixture.Mono-quaternisation of cis-1,k+2-diphosphabicycloalkanes, followed by treatment of the mono-quaternary salts with alkyllithium or Grignard reagents produces cis-1,n-disubstituted-1,n-diphosphacycloalkanes 4 exclusively; examples containing 8-, 9- and 10-membered rings and a range of substituents on phosphorus are described.Di-quaternisation of 1,k+2-diphosphabicycloalkanes, followed by hydrolysis, yields the trans-isomers of 1,n-disubstituted-1,n-diphosphacycloalkane monooxides 6 exclusively; reduction of these with LiAlH4 in benzene gives largely trans-1,n-disubstituted-1,n-diphosphacycloalkanes 7, but is not completely stereoselective.The structure and properties of these diphosphacycloalkanes are discussed.He(I) photoelectron spectra of 1,5-diphosphabicyclooctane, 1,6-diphosphabicyclononane and 1,6-diphosphabicyclodecane show little evidence of interaction between phosphorus lone pairs, unlike the corresponding hydrazines.The medium-ring diphosphacycloalkanes, 1,5-dimethyl-1,5-diphosphacyclooctane and 1,6-dimethyl-1,6-diphosphacyclodecane also show little evidence of interaction between phosphorus lone pairs.
