Tris 2-methoxyphenyl

Fig. 5 Crystal structures of a type B complex [Pd(l,2,3,8-r 4-octadiene-l,8-diyl)(PMe3)] (left) and type C complex [Pd(l,2,3,7,8-r 5-octa-2,7-dien-l-yl)(tris(2-methoxyphenyl)phosphine)]BF4 (right). The BF4 anion and hydrogen atoms are omitted for clarity [51, 53]...

Cationic methylplatinum(ii) complexes with an aqua ligand 146 and 147 are obtained by protonation of the dimethyl complexes having tris(///-sulfonatephenyl)phosphine and tris(2-methoxyphenyl)phosphite as the ligands 146 is in equilibrium with a neutral complex having a hydroxo ligand. Protonation of the Pt-Me bond has been studied in aqueous solutions. 

A well-stirred solution of 6.8 g of the mixed isomers of 1 -(2,3,6-tri-methoxyphenyl)propene in 40 g of dry acetone was treated with 3.2 g pyridine and cooled to 0 °C with an external ice bath. There was then added 6.5 g tetranitro-methane over the course of 1 min, the stirring was continued for an additional 2 min, and then the reaction mixture was quenched by the addition of 2.2 g KOH in 40 mL H20. There was additional H,0 added, and the organics were extracted with 3x75 mL CH,C12. The solvent from the pooled extracts was removed under vacuum, and the 5.3 g residue distilled at 0.2 mm/Hg. A fraction boiling at 150-170 °C proved to be largely 2,3,6-trimethoxybenzaldehyde. A second fraction (170-200 °C at 0.2 mm/Hg) also spontaneously crystallized to a yellow solid. This was recrystallized from MeOH to provide, after drying to constant weight, 2.8 g of 2-nitro-1 -(2,3,6-trimethoxyphenyl)propene with a mp of 73-74 °C. Anal. (C 2H N05) C,H. 

A gold(I)/tri(methoxyphenyl) phosphine complex incorporated into PVC membranes led to formulation of ISEs with fast (14 s) Nernstian response (10 2-10 6 M) to perchlorate, with excellent selectivity even over chlorate in both water and urine [28]. Chromium porphyrins in PVC gave ISEs with near-Nernstian response to salicylate (10 2-10 6 M) with UV spectra confirming binding of salicylate to the chromium atom [29]. 

Among the amines that have been resolved with (-)-DAG are a-phenylethylamine (a-methylbenzenemethanamine), [R-(R, R )]-2-amino-l-(4-nitrophenyl)-l,3-propanediol, 1,2,3,4,5,6,7,8-octahydro-l-(4-methoxyphenylmethyl)isoquinoline, 3-methoxymorphinan, 1,2,3,4-tetrahydro-7-methoxy-4-phenylisoquinoline, 3-hydroxy-i 7-methyl-morphinan, l,2,3,4-tetrahydro-6,7-dimethoxy-l-[3,4-(methylenedi-oxy)phenyl]isoquinoline, l,2,3,4-tetrahydro-6,7-dimethoxy-l-(3,4,5-tri-methoxyphenyl)isoquinoline, 2-[4-(phenylmethoxy)phenyl]-2-(3,4-di-methoxyphenyl)ethanamine, A-norlaudanosine (tetrahydropapaver-ine), and l,2,3,4-tetrahydro-6,7-dimethoxy-l-[3-methoxy-4- phenyl-methoxy)phenyl]isoquinoline. 

The alkaloid piplaitine XII-834, isolated from the roots of Piper hngum I. inn., is identical with piperlongumine. A 3,4-dihydro-2-pyridone structure was first proposed, but a detailed NMR study has shown it to be/V-[ 3,4,5-tri-methoxyphenyl)acrylyl]-5,6-dihydro-2 )yridone (XlI-834) Blastidone... 

Addition of tris(/)-methoxyphenyl)phosphine to the dinuclear Pt(ii)-cod complex with a bridging l,T-ferrocenyl-ene ligand 241 produces a paramagnetic Pt-phosphine complex with a bridging hydroxo ligand (242, Equation (68)). Oxidation of the Fe center by air and coordination of the OH ligand, formed from water impurity, take place during the reaction. 

Obtained by hydrolysis of l-(2,4-diacetoxy-3,5,6-tri-methoxyphenyl)ethanone (SM) with aqueous 10% sodium hydroxide at r.t. for 10-15 min. SM was obtained by Friedel-Crafts acylation of 2,3,5,6-tetramethoxyphenylacetate(m.p. 97-98°) with acetic anhydride/acetic acid in the presence of excess boron trifluoride at 50-60° for 5 h (65%, m.p. 82-84°) [3316]. 

Obtained by reaction of 3,4,5-tri methoxyphenyl-acetonitrile with phlo-roglucinol monomethyl ether (Hoech reaction) [5559]. 

The monosubstituted selenido-carbonyl open-triangular mdo-c ustcv Ru3(/i3-Se)2(GO)s(L) (L = tripyrrolidino-phosphine, tpnp), formed from the reaction of Ru3(GO)i2 with tpnpSe, reacts with tris(/ -methoxyphenyl)phosphine and l,2-bis(diphenylphosphinomethyl)benzene (dpmb), giving respectively, the di- and trisubstituted Ru3(/i3-Se)2(GO)6(tpnp)(dpmb) and Ru3(//3-Se)2(G0)7(tpnp) P(G6H40Me)3 clusters. 

The following method is described in U.S. Patent 2,430,891. To a solution of 10 parts of tris-p-methoxyphenyl ethylene in 35 to 40 parts of carbon tetrachloride Is added a solution of 2.0 parts of chlorine in 50 parts of carbon tetrachloride, with stirring, and over a period of Vj hour. The carbon tetrachloride is then removed by distillation on a steam bath and the residual oil is recrystallized from 250 to 400 parts of methanol, decolorizing with charcoal or the like if necessary. Tris-p-methoxyphenyl chloroethylene is obtained in a yield of 65 to 75%. It melts at 113° to 114°C. 

Unlike such unstable intermediates, the first, rare example of reversible dissociation of a carbon-carbon a bond into a stable carbocation and carbanion was reported for a nitro-dicyano compound (20) prepared from trimethyl- and triphenyl-cyclopropenylium tetrafluoroborate ([4" ]BF4 and [5 JBFJ) with the potassium salt of p-substituted-phenylmalononitrile anions (Arnett et al., 1983 Troughton et al., 1984 Arnett and Molter, 1985). Other ionically dissociative malononitrile derivatives have been prepared from such carbocations as the tropylium [S ] (Arnett and Troughton, 1983) and the tris(p-methoxyphenyl)methylium [93 j (Arnett and Troughton, 1983) ions. 

Monofunctional 2-bromo-2-methylpropionic acid 4-methoxyphenyl ester and difunctional l,4-(2/-bromo-2/-methyl-propionate)benzene initiators, given in Scheme 26, were employed for the polymerization of n-BuMA followed by the addition of DMAEMA, thus leading to the formation of PnBuMA-fo-PDMAEMA block and PDMAEMA-b-PnBuMA-h-PDMAEMA tri-... 

The triaryltin hydroxides and the bis(triaryltin) oxides are readily interconverted, and have sometimes been confused. Tris(o-methoxyphenyl)tin hydroxide can be identified in solution, but when it is isolated, it rapidly loses... 

Bis(2 -methoxyphenyl)-l,10-phenanthroline, bmpphen (2), forms a high-spin bis- but not a low-spin tris-ligand iron(II) complex due to interligand repulsion. ... 

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