Preparation and Use of a Polymer Supported BINAP Hydrogenation Catalyst

MoO2(acac)2 immobilized on polymers as catalysts for cyclohexene epoxidation: Effect of the degree of crosslinking

“…Such polymers are generally insoluble, with divinylbenzene crosslinked polystyrene as typical support. Bayston et al 9 prepared a bis(diphenylphosphino)-1,1Ј-binaphthyl (BINAP)-based diphosphine containing a functional group in the 6-position of the naphthalene ring. This diphosphine was then attached to an aminomethyl derivative of polystyrene (1 mol % DVB crosslinking) via this carboxylic acid group.…”

“…Highly crosslinked polymers (e.g., macromolecular polystyrenes) and inorganic supports (alumina or silica) hardly swell and can be efficiently used in different solvents without changes of texture or mass transport properties. 9,10 Immobilization via entrapment or intercalation in materials having well-defined pores and cavities such as zeolites or clays can also be used to produce reliable confinement of the metal complex. Whatever the used procedure, it is necessary to provide an appropriate anchorage of the active phase to the carrier surface to avoid leaching during catalytic reaction.…”

Aspects of Immobilisation of Catalysts on Polymeric Supports

“…From the 0.21 mmol g À1 amine functionalised PS, 0.18 mmol g À1 could be ligated. [54] Via an alternative procedure dihydroxy-functionalised BINAP was reacted with acidderived Tentagel (8). With Tentagel -Br an ether linkage is formed with dihydroxy-functionalised BINAP (9).…”

“Catalyst Analogue”: A Concept for Constructing Multicomponent Asymmetric Catalysts (MAC) by Using a Polymer Support

“…IR(neat): ñ max = 1070. 4 Polymer 6 A from 1 b: EGDMA (8 mL, 0.044 mmol) and MMA (430 mL, 4 mmol) were added to a cooled solution (0 8C) of 1 b (0.2 mmol) and AIBN (36 mg, 0.22 mmol) in THF (3.7 mL). The reaction mixture was heated at 70 8C for 10 h under Ar, then H 2 O was added to cleave the SiÀO bonds.…”

“…The binaphthol derivative 2 [4] was coupled with acryloyl chloride to give the ester 3. After removal of the TBS group of 3, the catalyst analogue 1 b was almost quantitatively prepared by the reaction of 4 with SiCl 4 in THF, and used directly in subsequent experiments.…”