Reillex resin

Reillex 425-HCl, dihydropyran, 86°, 1.5 h, 84-98% yield. The Reillex resin is a macroreticular polyvinylpyridine resin and is thus an insoluble form of the PPTS catalyst. 

Epoxy resin (Tufnol, Bakelite, Epophen) Styrene divinylbenzene ion exchange resins Reillex HPQ anion exchange resin Phenol/formaldehyde cation exchange resin Polyurethane Cellulose (as tissues)... 

A number of efforts have been devoted to the simplified, acid catalyzed reaction between dihydropyran and alcohols to form THP-ethers. Thus, employing the hydrochloride salt of Reillex 425 (34) [a cross-linked macroreticular poly(4-vinylpyri-dine) resin] the tetrahydropyranylation even of hindered alcohols proceeds under mild conditions in high yields without side-reactions (Scheme 4.20) [107]. 

Approximately half of the better resins were then tested for successive loading of succinic acid in simulated medium and regeneration using hot water. The final pH was near pH 5.0 This cycle was repeated for multiple cycles. Some of the hot water regeneration results are excerpted in Table 2. The best resins (Reillex 425, XUS 40285, and XUS 40091) have a stable capacity of about 0.06 g of succinic acid/g of resin. MWA-1 was not included in these tests because of its lower capacity however, it was reexamined in later... 

In a similar manner, the sorbents were tested for their capacity for the substrate of the planned fermentation, glucose. Glucose was found to adsorb with all tested resins (data not shown). Maximum glucose capacities ranged from 0.01 to 0.04 g/g. However, the resinpreferred succinic acid at a ratio near 4 1 for Reillex 425,4 1 for XUS 40091, and 8 1 for XUS 40285. Sorbents that preferentially sorbed glucose over succinic acid were eliminated from further testing. 

The solid supports used in this study were macroporous co-polymers of vinylpyridine and styrene crosslinked with divinylbenzene. Polymers of this type in the form of beads are available commercially (e.g. Reillex 425) and were also prepared for this study by Purolite. For spectroscopic studies, a more convenient sample morphology was required and thin-film polymers of similar stoichiometry were synthesised by the group of Sherrington at the University of Strathclyde. Full details of the methods used to prepare thin film polymers are reported elsewhere.11 To generate the ion exchange resin, the pyridyl functionalities of the polymer were quatemised with methyl iodide (Eq 1). 

N. Schroeder, S. Radinski, J. Ball, K. Ashley, S. Cobb, B. Cutrell, J. Adams, C. Johnson, and G. Whitner, Technetium partitioning for the Hanford tank waste remediation system anion exchange studies for partitioning technetium from synthetic DSSF and DSS simulants and actual Hanford wastes (101-SY and 103-SY) using Reillex -HPQ resin. Annual Report, LA-UR-95-4440 (Los Alamos National Laboratory, 1995). 

The criteria for selecting the proper adsorbent are capacity, specificity, ease of regeneration, and the ability to withstand repetitive regeneration. Although a resin exhibiting all of the desired properties has yet to be found, one specific resin, polyvinylpyridine (PVP) Reillex 425, appears satisfactory and has been tested for the recovery of lactic acid [13]. 

This adsorption technology uses polymer resins as sorbents (Amberlite, Am-bersorb, XUS, Reillex). The polymers consist of polystyrene, polyvinylepyri-dine and polymethylacrylats. In addition, carbonate resins and zeolithes (sili-... 

The same homogenous anionic rhodium catalyst is also active for the carbonylation of methyl acetate to acetic anhydride. The "immobilized" form on Reillex , a polyvinyl pyridine resin, has been reported for the carbonylation of methyl acetate to acetic anhydride. Literature procedures readily allow for the preparation of 2 to 5% by weight of rhodium on Reillex " (7). These catalysts... 

The chemisorption bond between the ligand and support is rather strong and cannot be easily broken by a simple solvent extraction. ISEC-determined swollen-state morphologies of the Reillex HP in THF resin without and with the ligand are shown in Figure 9.5. It is evident that the chemisorption of the ligand on the polyvi-nylpyridine chains induces substantial expansion of the polymer network. 

Protocols have been developed which utilize an insoluble solid catalyst in combination with dihydropyran to effect the protection of alcohols as their corresponding THP ethers. These procedures are advantageous in that the catalyst may be recovered by simple filtration and the products isolated by evaporation of volatiles. In many cases the catalyst can be reused without regeneration. Reaction of alcohols with dihydropyran in the presence of Amberlyst H-15 (25 °C, 1 h, 90-98%) yields THP derivatives. Alternatively, a solution of dihydropyran and the alcohol may be passed slowly through a column of silica overlaid with Amberlyst H-15 to yield the THP ethers directly (73-97%). The acidic clay Montmorillonite KIO (25 °C, 15-30 min, 63-95%) is similarly applicable, Reillex 425 resin (86 °C, 1,5 h, 84-98%) is applicable with the advantage that it does not promote the sometimes troublesome polymerization of dihydropyran. Polymeric derivatives of pyridinium p-toluenesulfonate are also effective. Poly(4-vinylpyridinium p-toluenesulfonate) and poly(2-vinylpyridinium p-toluenesulfonate) catalysts yield tetrahydropyranyl derivatives of primary, secondary, and tertiary alcohols (24 °C, 3-8 h, 72-95%). ... 

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