76347-13-2Relevant articles and documents
Preparation of tungsten-based olefin metathesis catalysts supported on alumina
Yuan, Jian,Townsend, Erik M.,Schrock, Richard R.,Goldman, Alan S.,Mueller, Peter,Takase, Michael K.
, p. 1985 - 1992 (2011)
A new tungsten alkylidene complex, W(NAr)(CHCMe2Ph)(OHIPT- NMe2)(pyrrolide) {Ar=2,6-(i-Pr)2C6H 3; HIPT-NMe2=2,6-[2,4,6-(i-Pr)3C 6H2]2-4-NMe2-C6H 2}, has been synthesized and shown to be highly selective for Z homocoupling metathesis of selected terminal olefins in pentane, as is W(NAr)(CH2CH2CH2)(OHIPT)(pyrrolide) (5). Both 5 and W(NAr)(CHCMe2Ph)(OHIPT-NMe2)(pyrrolide) (6) are adsorbed onto calcined alumina. Control experiments and metathesis homocoupling of four substrates lead to the conclusions that 5 is largely adsorbed in a reaction that liberates HIPTOH, while 6 is adsorbed largely through an interaction between the dimethylamino group and an acidic site on the surface. There is no evidence that any adsorbed catalyst can give rise to Z selectivity of a magnitude equal to that found in a homogeneous reaction involving 5 or 6. Copyright
SYNTHESIS OF BORONIC ESTERS AND BORONIC ACIDS USING GRIGNARD REAGENTS
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Paragraph 0123, (2013/03/26)
Boronic esters and boronic acids are synthesized at ambient temperature in an ethereal solvent by the reaction of Grignard reagents with a boron-containing substrate. The boron-containing substrate may be a boronic ester such as pinacolborane, neopentylglycolborane, or a dialkylaminoborane compound such as diisopropylaminoborane. The Grignard reagents may be preformed or generated from an alkyl, alkenyl, aryl, arylalkyl, heteroaryl, vinyl, or allyl halide compound and Mg°. When the boron-containing substrate is a boronic ester, the reactions generally proceed at room temperature without added base in about 1 to 3 hours to form a boronic ester compound. When the boron-containing substrate is a dialkylaminoborane compound, the reactions generally proceed to completion at 0°C in about 1 hour to form a boronic acid compound.
Reaction of grignard reagents with diisopropylaminoborane. Synthesis of alkyl, aryl, heteroaryl and allyl boronic acids from organo(diisopropyl)- aminoborane by a simple hydrolysis
Bailey, Christopher L.,Murphy, Chris L.,Clary, Jacob W.,Eagon, Scott,Gould, Naomi,Singaram, Bakthan
, p. 331 - 341 (2013/08/23)
Diisopropylaminoborane (BH2-N(iPr)2) is prepared by reacting lithium diisopropylaminoborohydride (iPr-LAB) with trimethylsilyl chloride (TMSCl). Aliphatic, aromatic, and heteroaromatic (diisopropylamino) boranes are readily synthesiz
