21321-31-3Relevant academic research and scientific papers
Generation and spectroscopic observation of a tungsten-carbene-alkene intermediate in cyclopropane formation
Casey, Charles P.,Shusterman, Alan J.
, p. 736 - 744 (1985)
The alkoxide-catalyzed reaction of but-3-en-1-ol with (CO)5W=C(OCH3)C6H4-p-CH3 gives the (butenyloxy)carbene complex (CO5)W=C(OCH2CH2CH=CH2)C 6H4-p-CH3, 1, which possesses a carbene ligand and an uncomplexed alkene. Upon heating at 38°C in benzene-d6, 1 is converted to the cyclopropane 1-(4-methylphenyl)-2-oxabicyclo[3.1.0]hexane, 10. During the conversion of 1 to 10, an intermediate tetracarbonyltungsten-carbene-alkene complex 15 was detected by 1H NMR and IR spectroscopy. Intermediate 15 reacted with CO to regenerate 1 and with PEt3 to give cis-(CO)4(PEt3)W=C-(OCH2CH 2CH=CH2)C6H4-p-CH3,18. The kinetics of the conversion of 1 to 10 are very complex. After an initial induction period, an accelerating autocatalytic decomposition of 1 occurs. A detailed mechanism for the autocatalysis is proposed in which the key steps are decomposition of tungsten-carbene-alkene intermediate 15 which reacts successively with two molecules of starting material 1 to generate W(CO)6 and 2 equiv of tungsten-carbene-alkene intermediate 15.
Structural Differences in η5-C5H5 and η5-P3C2But2 Tetrametallic Complexes. Synthesis of t2)(CO)8(PEt3)2> and t2)2(CO)6(PEt3)2>, (M= Cr, Mo, W). Crystal and Molecular Structure of
Hitchcock, Peter B.,Meidine, Mohamed F.,Nixon, John F.,Sillet, Gary J.D.
, p. 317 - 319 (2007/10/02)
The two tetrametallic complexes and 5-P3C2But2)2(CO)6(PEt3)2> have copletely different molecular structures.
Hitchcock, Peter B.,Meidine, Mohamed F.,Nixon, John F.,Sillet, Gary J.D.
, p. 317 - 319 (2007/10/02)
The two tetrametallic complexes and 5-P3C2But2)2(CO)6(PEt3)2> have copletely different molecular structures.
