The reaction of bis(trifluoromethyl) disulfide with organolithium reagents at −78 °C results in simultaneous scission of both the CS and SS bonds. Under similar conditions, the alkyl and aryl disulfides undergo only SS bond cleavage. This unusual behavior of bis(trifluoromethyl) disulfide is due to the presence of the trifluoromethyl function. The product distribution, the mechanism of bond fission
PREPARATION AND USE OF MIXED MODE SOLID SUBSTRATES FOR CHROMATOGRAPHY ADSORBENTS AND BIOCHIP ARRAYS
申请人:Boschetti Egisto
公开号:US20070015143A1
公开(公告)日:2007-01-18
For certain mixed mode resins having anionic character, a ligand is joined to a solid support via a linkage that includes a mercapto-, ether- or amino-containing moiety. A suitable ligand comprises an aromatic group, a heteroaromatic group, or a heterocyclic group, optionally fused, that is sulfate-, sulfonate-, phosphonate- or phosphate-substituted and that is linked to such a moiety. These resins possess an anionic character under conditions prescribed for their use. Separation of a biological substance, such as a peptide or protein, can be accomplished with a resin of this type via a change in the pH of eluants, thereby effecting adsorption and desorption.
Process For Producing Polydienes
申请人:Bridgestone Corporation
公开号:US20150031845A1
公开(公告)日:2015-01-29
A method for producing a polydiene, the method comprising the steps of (i) forming an active catalyst by combining a lanthanide-containing compound, an alkylating agent, and a halogen source in the substantial absence of an organosulfide; and (ii) polymerizing conjugated diene monomer in the presence of the active catalyst and an organosulfide.