Category: 4020-99-9

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Photochemistry of Substituted Benzyldiphenylphosphine Oxides

Photochemical reactions (lambda irr = 54 nm) of substituted benzyldiphenylphosphine oxides 1a-e have been investigated in benzene and acetonitrile. alpha-Cleavage from the singlet excited state is proposed as the primary process, and products formed both before and after escape of the primary intermediates from the solvent cage result. Radicals 2 and 3 are observed by nanosecond flash photolysis following excitation of 1a at 266 nm in acetonitrile. Acetone sensitization of 1a,b fails to improve the efficiency of product formation. The quantum yields of disappearance of 1a,b are unaffected by O2, and mechanisms for product formation from 1a in the presence of oxygen are proposed.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 4020-99-9, Name is Methoxydiphenylphosphine, Formula: C13H13OP.

Preparation and characterization of new C2- and C 1-symmetric nitrogen, oxygen, phosphorous, and sulfur derivatives and analogs of TADDOL. part II

TADDOL (=alpha,alpha,alpha?,alpha?-Tetraaryl-1,3- dioxolane-4,5-dimethanol) and the corresponding dichloride are converted to TADDAMINs (=(4S,5S)-2,2,N,N?-tetramethyl-alpha,alpha,alpha?, alpha?-tetraphenyl-1,3-dioxolan-4,5-dimethanamines) (Scheme 2) and ureas, 12-15, and to TADDOP derivatives with seven-membered O-P-O ester rings (Schemes 3 and 4). Cl/P-Replacement via the Michaelis-Arbuzov reaction (Scheme 7) on mono- and dichlorides, derived from TADDOL, are described. It was not possible to obtain phosphines with the P-atom attached to the benzhydrylic C-atom of the TADDOL skeleton (Schemes 6 and 7). The X-ray crystal structures (Figs. 1 and 2) of ten of the more than 30 new TADDOL derivatives are discussed. Full experimental details are presented. Copyright

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Formula: C13H13OP. In my other articles, you can also check out more blogs about 4020-99-9

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 4020-99-9, Name is Methoxydiphenylphosphine, molecular formula is C13H13OP. In a Article£¬once mentioned of 4020-99-9, Product Details of 4020-99-9

STERIC AND ELECTRONIC EFFECTS IN LIGAND SUBSTITUTION OF METAL CARBONYLS. RAPID KINETICS OF LABILE CARBONYLMANGANESE COMPLEXES BY TRANSIENT ELECTROCHEMICAL TECHNIQUES.

The ligand substitution kinetics of a series of carbonylmanganese cations MeCpMn(CO)//2L** plus with L equals 3- and 4-substituted pyridine ligands are measured for a variety of phosphine nucleophiles N of differing steric and electronic properties. The unified free energy relationship is shown for the first time to accommodate all the extensive rate data, if the steric effect is evaluated by Tolman’s cone angles for the phosphines, and the electronic effects are evluated by the acid-base dissociation constants of the pyridine ligands and the phosphine nucleophiles. The range of second-order rate constants k//1 for ligand substitution of MeCpMn(CO)//2L** plus extends over four decades from 3. 0 to 2 multiplied by 10**4 M** minus **1 s** minus **1. The mechanism of ligand substitution of metal carbonyls is central to the successful catalysis of a variety of important processes leading to the reduction of carbon monoxide.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 4020-99-9, Name is Methoxydiphenylphosphine, molecular formula is C13H13OP. In a Article£¬once mentioned of 4020-99-9, SDS of cas: 4020-99-9

Lewis acid catalyzed room-temperature Michaelis-Arbuzov rearrangement

The taming of the shrew! For the first time, a broadly applicable efficient room-temperature Arbuzov rearrangement is described. This reaction is accomplished through an atom-economical Lewis acid catalyzed process (see scheme, TMSOTf=trimethylsilyl trifluoromethane-sulfonate). The method has been generalized to primary and activated secondary phosphites, phosphinites, and phosphonites.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 4020-99-9, Name is Methoxydiphenylphosphine, molecular formula is C13H13OP. In a Article£¬once mentioned of 4020-99-9, SDS of cas: 4020-99-9

New octahedral RuCl2(CO)(L)[eta2-(P,O)-ketophosphane] complexes containing one hemilabile ketophosphane ligand

The reaction of the ketophosphanes Ph2PCH2C(=O)tBu (1), Ph2PCMe2C(=O)iPr (1?), or Ph2PCMe2CH2C(=O)Me (1?) with a precursor complex RuCl2(L)(eta6-p-cymene) [L = PMe3 (a), PMePh2 (b), PiPrPh2 (c), PPh3 (d), P(OMe)Ph2 (e), P(OMe)3 (f)] in methanol and under carbon monoxide, provides an access to a novel family of complexes (ttt)-RuCl2(CO)(L)[eta2-(P,O)-ketophosphane] (2a-e, 2?a,e,f, and 2?a) with trans-chlorine and trans-phosphorus atoms. Further reaction with carbon monoxide or acetonitrile under thermal activation yields the cis,cis,trans derivatives (cct)-RuCl2(CO)2(L)[eta1-(P)- ketophosphane] 4a,b and 4?a, and (cct)-RuCl2(CO)(MeCN)(L)[eta1-(P)-ketophosphane] 5a,b,d. Complexes 2a,b and 2?a rearrange under thermal activation, or after exposure to sunlight, into the (ctc and ccc)-RuCl2(CO)(L)[eta2-(P,O)-ketophosphane] isomers, with cis-chlorine and cis-phosphorus atoms, 6a,b and 6?a, respectively. Complexes 6a,b reversibly add one molecule of carbon monoxide when forming the all-cis derivatives (ccc)-RuCl2(CO)2(L)[eta1-(P)- ketophosphane] 7a,b, respectively. The removal of one chloride ligand in complexes 4a, 4?a, or 5a with silver tetrafluoroborate affords the stable cationic derivatives {RuCl(CO)(L?)(PMe3)[eta2-(P,O)- ketophosphane]}[BF4], 8a and 8?a (L? = CO) and 9a (L? = MeCN), respectively. Mild basic conditions are sufficient to allow the synthesis of the enolatophosphane derivatives (ttt)-RuCl(CO)2(L)[eta2-(P,O)-Ph2 PCH=C(tBu)O], 10a,c,e, and of the analogous (ccc) and (cct) isomers, 11a,b and 12a, respectively.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

4020-99-9, Name is Methoxydiphenylphosphine, molecular formula is C13H13OP, belongs to chiral-phosphine-ligands compound, is a common compound. In a patnet, once mentioned the new application about 4020-99-9, Computed Properties of C13H13OP

Benzyl diphenyl phosphorusoxychloride of synthesizing method (by machine translation)

The invention provides a synthetic benzyl diphenyl phosphorusoxychloride method of inter, the molar ratio of 1 : 1.1-1.4 diphenyl methoxy phosphorus and between the added to the reaction apparatus for making, to elevate temperature under stirring condition 55-60C, and at this temperature the reaction 10-14h, after the reaction is cooled to room temperature, between to benzyl diphenyl phosphorusoxychloride, the synthetic preparation method is simple, and the mild reaction, it is easy to realize. (by machine translation)

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.4020-99-9, Name is Methoxydiphenylphosphine, molecular formula is C13H13OP. In a Article£¬once mentioned of 4020-99-9, Formula: C13H13OP

On the reactivity of the iminodiphosphane C6H 4(o-CN)N=PPh2-PPh2: Fragmentation versus isomerisation

The reactivity of the iminodiphosphane C6H4(o-CN)N= PPh2-PPh2, which contains an N=P-P unit, has been investigated. Reaction with small molecules, [viz. H2P/O2, H2O2, CH3OH, C6H 4(o-CN)NH2] and elemental sulfur result in cleavage of the P-P bond to give aminophosphane-derivatised compounds. The products from these reactions have been characterized spectroscopically, including two by single-crystal X-ray diffraction. The reactivity of the iminodiphosphane towards the transition metal complexes [M(cod)Cl2] (M = Pd or Pt) has also been investigated. In the reactions, the iminodiphosphane rearranges to form the more common diphosphonylamine (P-N-P) unit which chelates to the metal centres. Three different compounds were isolated from these reactions and they have all been fully characterised by spectroscopy and single-crystal X-ray diffraction. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.

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Reference£º
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Dimethylphosphinate bridged binuclear Rh(i) catalysts for the alkoxycarbonylation of aromatic C-H bonds

A variety of binuclear rhodium(i) complexes featuring two bridging dimethylphosphinate ligands ((CH3)2PO2-) have been prepared and tested in the alkoxycarbonylation of aromatic C-H bonds. The complex [Rh(mu-kappaO,O?-(CH3)2PO2)(cod)]2 has been prepared by a reaction of [Rh(mu-MeO)(cod)]2 with 2 equivalents of dimethylphosphinic acid. Binuclear complexes [Rh(mu-kappaO,O?-(CH3)2PO2)(CO)L]2 (L = PPh3, P(OMe)Ph2 and P(OPh)3) were obtained by carbonylation of the related mononuclear complexes [Rh(kappaO-(CH3)2PO2)(cod)(L)], which were prepared in situ by the reaction of [Rh(mu-kappaO,O?-(CH3)2PO2)(cod)]2 with 2 equivalents of L. Conversely, if L = IPr, the reaction of [Rh(mu-kappaO,O?-(CH3)2PO2)(CO)L]2 with carbon monoxide affords the mononuclear complex [Rh(kappaO-(CH3)2PO2)(CO)2IPr]. The subsequent reaction with trimethylamine N-oxide gives the corresponding binuclear complex [Rh(mu-kappaO,O?-(CH3)2PO2)(CO)(IPr)]2 by abstraction of one of the carbonyl ligands. Complexes [Rh(mu-kappaO,O?-(CH3)2PO2)(cod)]2 and [Rh(kappaO-(CH3)2PO2)(cod)(L)] (L = IPr, PPh3, P(OMe)Ph2, P(OPh)3) are active precatalysts in the alkoxycarbonylation of C-H bonds, with the ligand system playing a key role in the catalytic activity. The complexes that feature more labile Rh-L bonds give rise to better catalysts, probably due to the more straightforward substitution of L by a second carbonyl ligand, since a more electrophilic carbonyl carbon atom is more susceptible toward aryl migration. In fact, complexes [Rh(mu-kappaO,O?-(CH3)2PO2)(CO)2]2 and [Rh(mu-Cl)(CO)2]2, generated in situ from [Rh(mu-kappaO,O?-(CH3)2PO2)(cod)]2 and [Rh(mu-Cl)(cod)2]2, respectively, are the most active catalysts tested in this work.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.4020-99-9, Name is Methoxydiphenylphosphine, molecular formula is C13H13OP. In a Article£¬once mentioned of 4020-99-9, Safety of Methoxydiphenylphosphine

Synthesis of diverse aromatic oxophosphorus compounds by the Michaelis-Arbuzov-type reaction of arynes

Arynes, generated in situ from o-(trimethylsilyl)aryl triflates by treatment with a fluoride, have been shown to react efficiently with various alkoxyphosphines via a mechanism similar to the Michaelis-Arbuzov reaction. Diverse aromatic oxophosphorus compounds, including derivatives with an ortho-ester function, have become easily available from a common aryne precursor by this method.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Electric Literature of 4020-99-9. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 4020-99-9, Name is Methoxydiphenylphosphine

pi-Insertion Reactions of Benzynes into P=N and P=S Double Bonds

The pi-insertion reactions of in situ generated benzynes into the P=N bonds of N-benzyl and N-aryl iminophosphoranes and the P=S bonds of phosphane sulfides have been examined by using the Kobayashi benzyne precursors, (2-trimethylsilyl)phenyl triflates. The reactions with iminophosphoranes afforded (2-aminophenyl)phosphonium triflates under mild conditions, most probably by a [2+2]/retro [2+2] cycloaddition sequence and further N-protonation by the solvent (CH3CN) or N-phenylation by a second molecule of benzyne. The final products of the analogous reactions with P-OCH3-substituted iminophosphoranes were the respective (2-aminophenyl)phosphane oxides, as result of a final O-demethylation event of the putative phosphonium triflate. The reactions with phosphane sulfides involve a final S-phenylation step to yield (2-phenylthio)phenylphosphonium salts. P-Phenylphosphonium triflates functionalized at the ortho position by amino or thio units were obtained by pi-insertion of benzyne into the P=N bond of an iminophosphorane or the P=S bond of a phosphane sulfide.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate