Phosphine, triisopropyl

The rate of polymerization can be controlled by a gel modification additive. A gel modification additive is a substance that cooperates with the catalyst to change the rate of the catalyzed reaction. Most generally, a gel modification additive may be any electron donor or Lewis base. Particularity suitable compounds acting in this way are tricyclohexylphosphine, tricyclopentylphosphine, triisopropyl-phosphine, triphenyl phosphine, and pyridine. 

NO2P2CMH2J, Phosphorus( 1 +), p-nitrido-bis(triphenyl-, acetate, 27 296 NO.iP2RhC2jH , Rhodium(I), carbonyl(4-pyridinecarboxylato)bis(triisopropyl-phosphine)-, 27 292... 

RhN03P2C2,H46, Rhodium(I), carbonyl(4-pyridinecarboxylato)bis(triisopropyl-phosphine)-, 27 292... 

HAZARD RISK Slight fire hazard when exposed to heat incompatible with acetone, strong alkalis, chemically active metals, dinitrogen tetraoxide, fluorine, potassium-tert-butoxide, sodium, sodium hydroxide, methanol, sodium methoxide, triisopropyl phosphine decomposition emits toxic fumes of hydrogen chloride gas, phosgene gas, carbon monoxide and carbon dioxide can be explosive when confined with water poses explosive hazard if present in boiler feed or cooling water NFPA code H 2 F 0 R 0. 

PtP3C27Hj3, Platinum(O), tri(triisopropyl-phosphine)-, 28 120 PtPjCj4H45, Platinum(O), tris(triphenyl-phosphine)-, 28 125... 

A similar complex could be isolated by the reaction of palladiumbis-(acetylacetonate) with two moles of triisopropyl phosphine and two moles of 6-lactone (Equation 7). By ring opening of the lactone a palladium complex with two long-chain carboxylate substituents was formed. It is remarkable that the same ring opening reaction which is discussed in the catalytic cycle could be observed in a related stoichiometric experiment. 

With ruthenium catalysts the same products are formed as in palladium catalysis, i.e. the Cg-6-lactone and traces of esters (compare Equation 6). Ruthenium(II)-hydrido-phosphine complexes such as RuH(OAc)-(PPh3)3, RuH2(PPh3)4, RuH(OAc)(CO)(PPh3)2 or RuH (C0)(PPh3)3 can be used as catalyst precursors. When triisopropyl phosphine is added as ligand yields up to 7 5l> are obtained. Of course, the yields are rather low, however, this is the first proof that both rhodium and ruthenium are active catalyst metals in diene/C02 chemistry. 

NOCbHb, Benzoyl isocyanide, chromium complex, 26 32, 34, 35 NOPC23H20, Benzamide, 2-(diphenyl-phosphino)-Al-phenyl-, 27 324 NOI bsHss) nzamide, N-[2-(diphenyl-phosphino)phenyl]-, 27 323 NObCbHb, 4-Pyridinecarboxylic acid, rhodium complex, 27 292 N02P2C3 H33, Phosphorus(l -t-), /i-nitrido-bis(triphenyl)-, acetate, 27 296 N03P2RhC25H4B, Rhodium(I), carbonyl(4-pyridinecarboxylato)bis(triisopropyl-phosphine)-, 27 292... 

Phosphites, such as triisopropyl and triphenyl phosphite, are weaker electron donors than the corresponding phosphines, but they are used in some reactions because of their greater rr-accepting ability. The cyclic phosphite trimethylol-propane phosphite (TMPP) or 4-ethyl-2,6,7-trioxa-l-phosphabicyclo[2.2.2]oc-tane (8), which has a small cone angle and small steric hindrance, shows high catalytic activity in some reactions It is not commercially available, but can be prepared easily[27]. 

A similar reaction sequence of triisopropylphenylphosphole or mesitylphosphole (17b and 17a, respectively) with phosphorus tribromide afforded the corresponding 2-substituted products. The reaction of dibromophosphine 37 with nucleophiles followed by oxidation or hydrolysis gave phosphonic or //-phosphinic derivatives (39 or 41, respectively) (Scheme 9) [48, 49], The regioselectivity is obviously the consequence of the presence or the lack of the steric hindrance with ortho tert-butyl groups, only position 3 is available, while with the smaller triisopropyl substituent, position 2 may be the appropriate reaction site. 

Phosphine, seleno-metal complexes, 664 bidentate, 664 Phosphine, tributyl-, 992 Phosphine, trichloro-, 990 Phosphine, tricyclohexyl-, 992 Phosphine, triethyl-, 992 Phosphine, trifluoro-jt acidity, 1034 Phosphine, triisopropyl-, 992 Phosphine, trimethyl-, 990, 992 oxides... 

C,H,N, Benzene, 2-isocyano-l,3-dimethyl-, iron complexes, 26 53 57 C,H jN, Benzenemethanamine, N,N-di-methyl-, lithium complex, 26 152 Iutetium complex, 27 153 palladium complex, 26 212 QHijP, Phosphine, cthylmethylphenyl-, lithium complex, 27 178 C,H,3P, Phosphorane, dimethylmethylene-diphenyl-, uranium complex, 27 177 C,H P, Phosphine, triisopropyl-, rhodium complex, 27 292 tungsten complex, 27 7 C,Hj7PSi3, Phosphine, tris(trimethylsilyl)-, 27 243... 

Reaction of (l,5-COD)Pt[CH2C(CH3)3]2 with bulky trialkylposphines, e.g., triisopropyl- and tricyclohexylphosphine, leads directly to 1, l-bis(phosphine)-3,3-dimethyl... 

C,H2iP, Phosphine, triisopropyl-, platinum complex, 28 120, 135 rhodium complex, 27 292 tungsten complex, 27 7 C,H27PSij, Phosphine, tris(trimethylsilyl)-, 27 243... 

A number of interesting applications of cycloisomerization to natural product syntheses have been carried out by Trost. As an example, total synthesis of picro-toxinin has been achieved based on cycloisomerization (Alder-ene reaction) of the 1,6-enyne system 141 as a key reaction. No satisfactory cyclization of 141 occurred when phosphine ligands such as P(o-Tol)3, DPPB, and triisopropyl phosphite were used. However, smooth cyclization took place to give the Alder-ene product in a quantitative yield at 50 °C when A,A -bis(benzylidene)ethylenediamine (BBEDA) was used as a ligand, and the triol 142 was obtained in 75 % yield after... 

Triethyl phosphine Triethyl phosphite Triethyl phosphonoacetate Triethyl phosphonoformate Triisopropyl phosphite 3,4,5-Trimethoxybenzoyl chloride 1,2,4-Trimethyl benzene 2,4,6-Trimethylbenzoyldiphenylphosphine oxide Trimethyl phosphite Tripropylene glycol Urethane n-Valeric acid Vinyl bromide p-Xylene D(+)-Xylose intermediate, pharmacologicals... 

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