133401-36-2Relevant academic research and scientific papers
Formation of dimers that contain unbridged W(IV)/W(IV) double bonds
Lopez, Lourdes Pia H.,Schrock, Richard R.
, p. 9526 - 9527 (2004)
A tungsten neopentylidene complex has been found to decompose to yield a heterochiral dimer that contains a W=W double bond and no bridging ligands. Decompositions of related bisalkoxide complexes also yield compounds that contain an unsupported W=W double bond, while a sample of [Mo(NAr)(CH2-t-Bu)(OC6F5)]2 has been found to be a homochiral species related to [W(NAr)(CH2-t-Bu)(OC6F5)]2. Copyright
Reactions of M(N-2,6-i Pr2C6H3)(CHR) (CH2R′)2 (M = Mo, W) complexes with alcohols to give olefin metathesis catalysts of the type M(N-2,6-i-Pr2C 6H3)(CHR)(CH2R′)(OR″)
Sinha, Amritanshu,Lopez, Lourdes Pia H.,Schrock, Richard R.,Hock, Adam S.,Mueller, Peter
, p. 1412 - 1423 (2008/10/09)
The reaction between M(NAr)(CH-t-Bu)(CH2-t-Bu)2 (M = Mo, W, Ar = 2,6-i-Pr2C6H3) and various alcohols (1-adamantyl-OH, t-BuOH, ArOH, (CF3)2CHOH, (CF 3)2MeCOH, CF3Me2COH, (CF 3)3COH, C6F5OH) in pentane or toluene yields either complexes of the type M(NAr)(CH-t-Bu)(CH 2-t-Bu)(OR), through direct addition of ROH across a Mo-C bond, or complexes of the type M(NAr)(CH2-t-Bu)3-(OR), through direct addition of ROH across a Mo=C bond. The trineopentyl species appear to be formed when the alcohol has a relatively low pKa value. The outcome also can depend on whether the alcohol is employed neat or in benzene, and mixtures are observed in some circumstances. The conversion of M(NAr)(CH 2-t-Bu)3(OR) into M(NAr)(CH-t-Bu)(CH2-t-Bu)(OR) was shown to be unimolecular in several examples. Preliminary experiments have shown that M(NAr)(CH-t-Bu)(CH2-t-Bu)(OR) complexes are surprisingly active catalysts for various metathesis reactions, although conversion is sometimes limited by decomposition of intermediate alkylidenes to yield dimeric species that contain M=M bonds. In contrast, M(NAr)(CH-t-Bu)(CH 2-t-Bu)2 species are virtually inactive for metathesis. X-ray structures are reported for Mo(NAr)(CH2-t-Bu) 3(OC6F5), Mo(NAr)(CH-t-Bu)(CH 2-t-Bu)[OSi(O-t-Bu)3], [Mo(NAr)(CH-t-Bu)-(CH 2-t-Bu)(OC6F5)]2, and Mo(NAr)(CH-t-Bu)(CH2-t-Bu)(OC6F5)(PMe 3).
Synthesis and study of imidoalkyl complexes of tungsten(VI): Application of 14N NMR spectroscopy
Le Ny, Jean Pierre,Osborn, John A.
, p. 1546 - 1550 (2008/10/08)
Complexes of the type W(NR)(CH2But)3X have been synthetised by reaction of WOCl4 with RNCO, followed by alkylation with dineopentylmagnesium. The structures of these complexes and their adducts with Lewis acids
