24 research outputs found
P-[N-(DiphenylÂphosphoÂrothioÂyl)isoÂpropylÂamino]-N-isopropyl-P-phenylÂthioÂphosphinic amide
The title compound, C24H30N2P2S2, was obtained by the reaction of Ph2PN(iPr)P(Ph)N(iPr)H with elemental sulfur in tetraÂhydroÂfuran. In the solid state, intraÂmolecular N—H⋯S hydrogen bonding influences the molÂecular conformation; a P—N—P—N torsion angle of 2.28 (9)° is observed. The two phenyl rings attached to one P atom form a dihedral angle of 74.02 (4)°
An Evaluation of Bitcoin From Shariah Perspective
Bitcoin is one of the most successful cases of blockchain use. The objective of this paper is to examine the characteristics of cryptocurrencies, with a specific emphasis on bitcoin. The fundamental attributes, features of bitcoin and how they operate on blockchain are evaluated from the Shariah perspective to determine if they are consistent with Shariah principles. To accomplish the objective, the authors adopted a qualitative secondary analysis (QSA) approach by utilizing the existing data
Synthesis and Reactions of the Homoleptic Chromium(II) Bis-amide [Ph<sub>2</sub>PN(<sup>i</sup>Pr)P(Ph)N(<sup>i</sup>Pr)−]<sub>2</sub>Cr with Relevance to a Selective Catalytic Ethene Trimerization System to 1-Hexene
New organometallic compounds were obtained on the basis
of the
aminodiphosphinoamine ligand Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)-H (<b>1</b>), which is relevant for the selective
ethene trimerization system consisting of ligand <b>1</b>, CrCl<sub>3</sub>(THF)<sub>3</sub>, and Et<sub>3</sub>Al. This catalytic system
produces 1-hexene in more than 90% yield and high purity. Here, we
report a more efficient, high-yield synthesis of the recently published
homoleptic magnesium complex [Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)−]<sub>2</sub>Mg (<b>2</b>) by reaction of <i>n</i>-butylethylmagnesium and <b>1</b> in Et<sub>2</sub>O. Compound <b>2</b> can be used as a reagent to transfer the
amide moiety [Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)−]
effectively to a chromium or aluminum center. <i>In situ</i> synthesis of the magnesium amide <b>2</b> followed by addition
of CrCl<sub>2</sub>(THF)<sub>2</sub> results in the formation of the
homoleptic chromiumÂ(II)Âbis-amide [Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)−]<sub>2</sub>Cr (<b>3</b>) by transmetalation.
The structure of chromium compound <b>3</b> is in some aspects
similar to that of the corresponding homoleptic magnesium complex <b>2</b>. Reacting <b>2</b> with ethylaluminum dichloride results
in the formation of the respective aluminum amide [Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)−]Â[AlEtCl] (<b>4</b>), for which the direct synthesis of <b>1</b> with diethylaluminum
chloride was unsuccessful. Additionally, we investigated compound <b>3</b> with potentially interesting activators such as Et<sub>2</sub>Zn, Et<sub>3</sub>Al, and Et<sub>3</sub>B to obtain more information
about the catalytic properties of these systems
Synthesis and Reactions of the Homoleptic Chromium(II) Bis-amide [Ph<sub>2</sub>PN(<sup>i</sup>Pr)P(Ph)N(<sup>i</sup>Pr)−]<sub>2</sub>Cr with Relevance to a Selective Catalytic Ethene Trimerization System to 1-Hexene
New organometallic compounds were obtained on the basis
of the
aminodiphosphinoamine ligand Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)-H (<b>1</b>), which is relevant for the selective
ethene trimerization system consisting of ligand <b>1</b>, CrCl<sub>3</sub>(THF)<sub>3</sub>, and Et<sub>3</sub>Al. This catalytic system
produces 1-hexene in more than 90% yield and high purity. Here, we
report a more efficient, high-yield synthesis of the recently published
homoleptic magnesium complex [Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)−]<sub>2</sub>Mg (<b>2</b>) by reaction of <i>n</i>-butylethylmagnesium and <b>1</b> in Et<sub>2</sub>O. Compound <b>2</b> can be used as a reagent to transfer the
amide moiety [Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)−]
effectively to a chromium or aluminum center. <i>In situ</i> synthesis of the magnesium amide <b>2</b> followed by addition
of CrCl<sub>2</sub>(THF)<sub>2</sub> results in the formation of the
homoleptic chromiumÂ(II)Âbis-amide [Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)−]<sub>2</sub>Cr (<b>3</b>) by transmetalation.
The structure of chromium compound <b>3</b> is in some aspects
similar to that of the corresponding homoleptic magnesium complex <b>2</b>. Reacting <b>2</b> with ethylaluminum dichloride results
in the formation of the respective aluminum amide [Ph<sub>2</sub>PNÂ(<sup>i</sup>Pr)ÂPÂ(Ph)ÂNÂ(<sup>i</sup>Pr)−]Â[AlEtCl] (<b>4</b>), for which the direct synthesis of <b>1</b> with diethylaluminum
chloride was unsuccessful. Additionally, we investigated compound <b>3</b> with potentially interesting activators such as Et<sub>2</sub>Zn, Et<sub>3</sub>Al, and Et<sub>3</sub>B to obtain more information
about the catalytic properties of these systems
Influence of cultivation sites on sterol, nitrate, total phenolic contents and antioxidant activity in endive and stem chicory edible products
Coordination chemistry of new selective ethylene trimerisation ligand Ph2PN(iPr)P(Ph)NH(R) (R = iPr, Et) and tests in catalysis
Assesssing the survival of transgenic plant DNA in the human gastrointestinal tract
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