223769-13-9Relevant articles and documents
Formation of chelated counteranions using lewis acidic diboranes: Relevance to isobutene polymerization
Chai, Jianfang,Lewis, Stewart P.,Collins, Scott,Sciarone, Timo J.J.,Henderson, Lee D.,Chase, Preston A.,Irvine, Geoffrey J.,Piers, Warren E.,Elsegood, Mark R.J.,Clegg, William
, p. 5667 - 5679 (2008/10/09)
The reactions of chelating diboranes with PhCMe2Cl and related initiators were studied by variabletemperature NMR spectroscopy. Although thermally stable ion-pairs featuring weakly coodinating anions (WCA) are formed, isobutene polymerization is complicated by the tendency of these WCA to act as hindered bases toward Bronsted acidic chain ends.
Bifunctional perfluoroaryl boranes: Synthesis and coordination chemistry with neutral lewis base donors
Chase, Preston A.,Henderson, Lee D.,Piers, Warren E.,Parvez, Masood,Clegg, William,Elsegood, Mark R. J.
, p. 349 - 357 (2008/10/09)
A practical synthetic route for the preparation of the known bifunctional perfluoroaryldiborane C6F4-1,2-[B(C6F 5)2]2,1, and the new diborane C 6F4-1,2-[B(C12F8)]2, 2, that circumvents the use of toxic mercury reagents has been developed. Key intermediates and 2 have been fully characterized in solution and the solid state. Solution and structural investigations of their MeCN and THF adducts have shown that 2 is a superior Lewis acid to 1, primarily owing to the reduction in steric pressure afforded by the planar 9-borafluorene rings in 2 versus the freely rotating set of pentafluorophenyl rings in 1. The two compounds bind Lewis bases via differing coordination modes, as demonstrated by the solid-state structures of the Lewis base adducts 1·MeCN, 2·THF, and 2·MeCN. Solution studies suggest that bis Lewis base adducts are also accessible; the structures of two examples (1·(MeCN)2 and 2·(THF)2) have been determined, and their role in the dynamic solution behavior of these systems is discussed.
1,2-bis(9-bora-1,2,3,4,5,6,7,8-octafluorofluorenyl)-3,4,5,6-tetrafluorobenzene and related compounds and methods
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Page/Page column 5; Sheet 2, (2010/02/14)
The compound 1,2-bis(9-bora-1,2,3,4,5,6,7,8-octafluorofluorenyl)-3,4,5,6-tetrafluorobenzene, analogs of the compound, and methods for making the compound and its analogs.
Isobutene Polymerization Using a Chelating Diborane Co-Initiator
Lewis, Stewart P.,Taylor, Nicholas J.,Piers, Warren E.,Collins, Scott
, p. 14686 - 14687 (2007/10/03)
Lewis acidic diborane 1 (J. Am. Chem. Soc. 1999, 121, 3244?3245) is highly effective for both proton- and cationogen-initiated isobutene polymerization in hydrocarbon media at low temperature. Reactions of diborane 1 with cumyl chloride and cumyl methyl ether were studied by variable-temperature 1H and 19F NMR spectroscopy. At low temperatures stable ion pairs 2a and 2b are formed; at higher temperatures these ion-pairs form phenyl-1,3,3-trimethylindan (3) with concomitant release of HCl to form 1 in the case of 2a or degradation of the anion (2b). Reaction between Ph3C-Cl and diborane 1 resulted in the generation of an ion-pair 4 consisting of the Ph3C cation very weakly associated with the chelated, μ-Cl counteranion as revealed by X-ray crystallography. Copyright
