ChemInform Abstract: MONOMERIC AND DIMERIC IMIDOPHOSPHATES DERIVED FROM ETHYLENE GLYCOL

Abstract

Derivate des Ethylenglykols.

Imide–amide rearrangement of oxazaphosphorimidates: studies towards the application to the synthesis of chiral Lewis bases

“…The first nucleophilic attack of the imidic nitrogen atom of a free oxazaphosphorimidate molecule to the phosphorus atom of a BF 3 -oxazaphosphorimidate adduct (A, Scheme 7) is a process analogous to the dimerization referred previously. [19][20][21] In this case, and in contrast to the dimerization of 19, we predict the migration of the oxygen atom of the attacked molecule instead of the imidic nitrogen, since this last is blocked by the BF 3 . This can explain why the addition of BF 3 to a partially dimerized mixture of 19 and 20 leads to the formation of 21 stopping the formation of more 20.…”

“…[19][20][21] According to the literature, the dimerization is highly dependent on the phosphorus substituents nature, being favoured by electronegative substituents such as fluorine or chlorine, that lead to a higher contribution of the betain (P C -N K ) structure, thus activating the molecule for the dimerization. The reduction of the ring strain when going from 19 to 20, due to the different geometry of the phosphorus atom in the dimeric form, was also pointed out as a factor contributing to this process.…”

Click chemistry on diterpenes: anti-inflammatory activity of the acetylenic derivatives of levopimaric acid and products of their transformations

“…Hexane was added and the resulting precipitate was filtered off to afford of the azide. 4-Azidoanisole (6c), 33 p-azidoacetophenone (6d), 34 1-azido-4-fluorobenzene (6e), 35 n-hexyl azide (6a), 36 benzyl azide (6b) 37 were prepared as described in the literature. 1-(4-Methoxyphenyl)-1H-1,2,3-triazol-4-yl)methyl-16-isopropyl-1,4a-dimethyl-1,2,3,4,4a,4b,5,6a,7,12,12a,13,14,14a-pentadecahydro-2H-(6,12b-etheno …”

Crystal and molecular structure of [W(CH2PMe3)(CO)2Cl(PMe3)3][CF3SO3], a seven-coordinate tungsten(II) complex produced by transfer of a trimethylphosphine to the W:CH2 system

“…Thus, [W(i75-C5H5)2-(=CH2)(CH3)+], which is isoelectronic with Ta(i75-C5H5)2-(=CH2)(CH3), was postulated as an intermediate in the formation of [W(j/5-C5H5)2(C2H4)H+] from [W(775-C5H5)2-(CH3)2+][PF6"] upon treatment of the latter with the trityl radical. 4 A similar species, [W(7/5-C5H5)2(=CH2)H+], has also been proposed.5…”