The fraction of membrane surface covered by chitosan is estimated to be lower than 40 %, which corresponds to the formation of a flat layer of chitosan on the membrane surface on an electrostatic basis. 展开 关键词: gamma-Spirolactones benzofuran-2,3-diones acetylenic esters triphenylphosphine ...
Similar procedure was applied using tetrakis- (triphenylphosphine)palladium(0) (2.0 mg, 0.003 mmol, 5 mol%) to yield deep blue powder PTB7-3 (63 mg, 98% yield). GPC: Mn = 108900, Mw/Mn = 2.56. PTB7-1 obtained from Pd2(dba)2 catalyst showed lower molecular weight of Mn = 41k ...
Part II. Isomerisation of n-pentenes and hex-1-ene Hydridocarbonyltris(triphenylphosphine)rhodium(I), RhH(CO)(PPh3)3, in benzene solutions is an homogeneous catalyst for the rapid isomerisation of alk-1-enes. Rate studies have been made with pent-1-ene, which gives a mixture of cis- ...
We have developed a method to obtain a polymer gel consisting of a relatively homogeneous network structure composed of polymers with a narrow molecular weight simply by mixing the necessary compounds. In this method, a radical chain polymerization reaction with a fast reaction rate is combined with...
(2-pyridyl)pyrazine (Pypy), n = 1, m = 0 or 1; L = imidazole (Him), 1-methylimidazole (1-MeIm), 2-methylimidazole (2-MeImH), 1,10-phenanthroline (phen), 2,2′-bipyridyl (bipy), 2,9-dimethyl-1,10-phenanthroline (Cupr) and triphenylphosphine oxide (PPh3O), n = 2, m = ...
Onset points correspond to work function of the materials. tpp: triphenylphosphine, PVP: polyvinylpyrrolidone, PhB(OH)2: phenylboronic acid, and TCNQ: tetracyanoquinodimethane. (d) A plausible n-type doping mechanism; left panel: the pristine SWNTs are p-doped with oxygen and/or defects ...
After elimination of the allyloxycarbonyl (alloc) group on lysine at the middle of the peptides with tetrakis (triphenylphosphine palladium), biotin was conjugated to the free epsilon amine group at lysine. For simplicity, the bivalent cotinine-conjugated peptides crosslinked with biotin are ...
Experimental Material and general procedures All starting materials were of reagent grade and were used as received, except that triphenylphosphine was recrystallized from etha- nol. Literature methods were used from the synthesis of Bi(OAc), ( 3 , Bi(SPh), (6), Pb(SPh), (7), Ph,As[Pb(...
N-dimethylaniline, p-nitro-N,N-dimethylaniline, phosphoniums from triethylphosphine, triphenylphosphine, and diphenylphosphine, oxoniums from ethers such as dimethyl ether diethyl ether, tetrahydrofuran and dioxane, sulfoniums from thioethers, such as diethyl thioethers, tetrahydrothiophene, and mixtures ...
To the iodonaphthalene (50 mg, 0.16 mmol) in dry triethylamine (5 mL) was added bis(triphenylphosphine)-palladium (II) chloride (5 mg, 4 mol %), excess p-methoxyphenylacetylene (32 mg, 0.24 mmol, 1.5 eq) and a catalytic amount of cuprous iodide (3 mg, 10 mol %). The mixture was...