472967-70-7

Upstream product

• 472967-63-8 ((C(CH₃)3)3C₆H₂PCBr(CH₃))W(CO)5 
• 865-47-4 potassium tert-butylate 
• 811-98-3 d⁽⁴⁾-methanol 
• 472967-63-8 pentacarbonyl((Z)-2-bromo-1-(2,4,6-tri-t-butylphenyl)-1-phosphapropene)tungsten⁽⁰⁾ 
• 36477-75-5 tungsten pentacarbonyl tetrahydrofuran 
• 122279-50-9 1-(2,4,6-tri-tert-butylphenyl)-1-phosphaallene 
• 100281-28-5 (Z)-2-bromo-1-(2,4,6-tri-t-butylphenyl)-1-phosphapropene 

Relevant academic research and scientific papers

Preparation and properties of kinetically stabilized phosphaethene derivatives carrying the methylsulfanyl group

1-Methylsulfanyl-2-(2,4,6-tri-t-butylphenyl)-2-phosphaethenyllithiums, prepared from (Z)-2-bromo-2-methylsulfanyl-1-(2,4,6-tri-t-butylphenyl)-1-phosphaethene, displayed an E/Z isomerization upon warming to room temperature. The copper-mediated coupling reaction afforded (Z,Z)-2,3-bis(methylsulfanyl)-1,4-diphosphabuta-1,3-diene. The reaction of the phosphaethenyllithiums with dimethyl disulfide and iodomethane gave the corresponding bis(methylsulfanyl)phosphaethene and a methylated E-isomer, respectively. On the other hand, the latter methylated Z-isomer was alternatively prepared from (Z)-2-bromo-1-(2,4,6-tri-t-butylphenyl)-1-phosphapropene. Both methylated E- and Z-isomers were allowed to react with W(CO)5(thf) to give the corresponding pentacarbonyltungsten(0) complexes, either of which was deprotonated to give the 3-phospha-2-propenyllithium derivative leading to the formation of a homocoupled (Z,Z)- 1,6-diphosphahexa-1,5-diene complex. Some key compounds were analyzed by X-ray crystallography, revealing the effect of the methylsulfanyl group on the structures. A straightforward preparation of 1-(2,4,6-tri-t-butylphenyl)-1-phosphaallene as well as its carbonyltungsten(0) complex is also described.

Copper-mediated coupling reaction of kinetically stabilized 1-methyl-2-phosphaethenyllithiums involving an isomerization to a 3-phospha-2-propenyllithium derivative

Copper-mediated coupling reaction of 1-methyl-2-(2,4,6-tri-t-butylphenyl)-2-phosphaethenyllithiums afforded 1,4-dipho-sphabuta-1,3-diene or 1,6-diphosphahexa-1,5-diene derivatives, depending upon non-coordinated or coordinated to W(CO)5, which facilitates an isomerization to a 3-phospha-2-propenyl-lithium.