Dibenzyl- phosphine

In the course of this study, the authors determined /Lvalues for dibenzyl, methyl phenyl, methyl p-nitrophenyl, di-p-tolyl, di-isopropyl and tetramethylene sulphoxides and for diethyl, dipropyl and dibutyl sulphites. The /Lscales are applied to the various reactions or the spectral measurements. The /Lscales have been divided into either family-dependent (FD) types, which means two or more compounds can share the same /Lscale, family-independent (FI) types. Consequently, a variety of /Lscales are now available for various families of the bases, including 29 aldehydes and ketones, 17 carboxylic amides and ureas, 14 carboxylic acids esters, 4 acyl halides, 5 nitriles, 10 ethers, 16 phosphine oxides, 12 sulphinyl compounds, 15 pyridines and pyrimidines, 16 sp3 hybridized amines and 10 alcohols. The enthalpies of formation of the hydrogen bond of 4-fluorophenol with both sulphoxides and phosphine oxides and related derivatives fit the empirical equation 18, where the standard deviation is y = 0.983. Several averaged scales are shown in Table 1588. 

Partial desulfurization. Disulfides (cyclic, benzylic, aralkyl, and dialkyl) are converted into sulfides by reaction with the reagent at 25-80°.3 For example, when dibenzyl disulfide is treated with a 10% excess of the phosphine in refluxing benzene... 

Many communications have concentrated on specific amino phosphonic acids or derivative types. Thus, esters of phosphonoaminoacetic add were obtained by the reactions between trialkyl (ethyl) phosphite and (218) and which are thought to proceed via the phosphorane (219). A sequence has been presented for the preparation of the mono- and di-benzyl esters of N-chz protected (a-aminoben-zyl)phosphonic acid. A synthesis of (aminomethylene)bisphosphonic acid from dibenzylamine, dibenzyl hydrogenphosphonate and triethyl orthoformate has been noted and the asymmetric hydrogenation of (220) in the presence of chiral phosphine catalysts yields samples of (221) with e.e.s of 63-96%. The pyrrolidine-based compound (222) has been prepared from methyl S)-N-methoxycarbonyl-4-oxo-2-pyrrolidinecarboxylate and iV-coupled 4-amino-butanal diethyl acetals were the starting materials in syntheses of the pyrrolidine-2-phosphonic add derivatives (223) in which Z represents the iV-protected amino add or peptide moiety. ... 

The reaction of the dialdehyde, obtained by a double ozonolysis of 118, with dibenzyl aspartate afforded the cyclic benzyl phosphinate 119. A pallado-catalyzed hydrogenolysis produced 4-azaphosphinane 107 in 85% yield (Scheme 24). 

The phosphinate 121 was formed by alkylation of isoprenyl-//-phosphinic acid 120 using A-bromoacetyl aspartic acid dibenzyl ester under silyl-Arbusov conditions. The resulting phosphinic acid was esterified using benzylbromide in the presence of silver oxide [105]. In one way, an ozonolysis of 121 followed by a... 

Benzenenitrile. See Benzonitrile Benzene, (2-nitroethenyl)-. See 8-Nitrostyrene Benzene, pentabromoethyl-. See Pentabromoethyl benzene Benzene, (phenylethyl)-. See Dibenzyl Benzene phosphinic acid CAS 644-97-3 Synonyms BPA... 

A single short H bond links two phosphine oxide molecules in (Ph3PO)2H+ AuClj (13.34a) and two acid phosphate ions in KH5(P04)2 (13.34b). Continuous chains are formed in p-dichlorophenyl phosphate (13.34c), dimer rings in dibenzyl phosphoric acid (13.34d) and rings in the ruthenium complex (13.34e). 

With the complex containing (R)-MeO-BiPHEP the results with mono- and dibenzylic substrates were similar to those obtained with complex 94 (Table 6.14) but at room temperature instead of at 30 °C. Interestingly, in contrast to 94 it was found that the complex with the phosphine (i )-DIFLUORPHOS is active in the phosphination of aliphatic substrates (Table 6.15). ... 

Extrusion of sulphur from disulphides " and trisulphides gives sulphides and disulphides, respectively, by treatment with phosphines (a polymeric aminophosphine has been advocated ), phosphites, and MeHgOAc. Ionic pathways continue to be preferred for these reactions, and concurrent electrophilic and nucleophilic mechanisms are in operation, according to interpretations of kinetic data for the reaction with dimethyl disulphide. A new view on nucleophilic attack is advanced in this work, where the encounter involves the o orbital of the S—S bond. Further support is given by c.i.d.n.p. to a radical mechanism that involves PhCHjSe for the reaction of dibenzyl selenide with PhjP. The process PhTeTePh + RN2 Cl - RTeCljPh in the presence of lCu(OAc)2l may be more easily understood on this basis. 

C3ftH28Cl20ftU 2 C2Hft02, trans-Dichlorobis(trans,trans-dibenzyl-ideneacetone)dioxouranium(VI) acetic acid solvate, 45B, 1223 C3 5H50F6NO2P5RU, Carbonyl(dimethylcarbamato)tetra(dimethylphenyl-phosphine)ruthenium(II) hexafluorophosphate, 44B, 861 C36H22O10R62 f Bis(M 0 l,3-diphenylpropane-l,3-dionatotricarbonyl-rhenium(D), 39B, 774... 

A new phosphorylating reagent, dibenzyl phosphorofluoridate, has been introduced. In the presence of caesium fluoride as base it reacts with primary and anomeric hydroxy groups preferentially. Secondary hydroxy groups, e.q.. those of partially protected myo-inositol, can be phosphorylated after deprotection with butyl lithium. 1,2-Di-phosphates were obtained in good to excellent yields by treatment of vicinal diols with diethyl phosphorochloridate and butyl lithium there was no evidence of formation of cyclic phosphates, the predominant products when other bases are used. Q-Glycosylation of phosphonic and phosphinic acids has been achieved by the trichloroacetimidate method examples are given in Scheme 4. ... 

---