97012-38-9

Upstream product

• 1898-77-7 trimethylphosphine-borane 
• 18283-93-7 tetraborane 
• 60-29-7 diethyl ether 
• 594-09-2 trimethylphosphane 
• 71749-92-3 trimethylphosphine-tetraborane adduct 
• 112968-02-2 (B₃H₆N(CH₃)3P(CH₃)3)⁽¹⁺⁾*B₂H₇^(1-)=(B₃H₆N(CH₃)3P(CH₃)3)B₂H₇ 

Downstream Products

• 19624-22-7 pentaborane⁽⁹⁾ 
• 1898-77-7 trimethylphosphine-borane 
• 97551-46-7 trimethylamine-trimethylphosphine-diborane⁽⁴⁾ 
• 75-22-9 trimethylamine-borane 

Relevant academic research and scientific papers

Tetraborane(8) adducts of strongly basic phosphines

Four methods were developed for the preparation of B4H8·P(CH3)3: the removal of one of the trimethylphosphine ligands from B4H8·P(CH3)3 by B2H4, the hydride removal from B4H9·P(CH3)3- by B2H6, the boron framework expansion of B3H7·THF with the use of B2H4·2P(CH3)3, and the reaction of B3H6·2P(CH3)3 +B3H8- with trimethylamine. The yields were better than 90%. The adduct of tris(dimethylamino)phosphine, B4H8·P[N(CH3)2]3, was prepared by the hydride removal reaction of B4H9·P[N(CH3)2] 3-. Two hypho-class bis(base) adducts of B4H8 were prepared from the above mono(phosphine) adducts. These were B4H8·P(CH3)3·N(CH 3)3 and B4H8·P(CH3) 3·P[N(CH3)2]3. The former existed in two isomeric forms, each being different from the other in the positions of the two different ligands. These compounds were characterized by their 11B, 1H, and 31P NMR spectra.

Reaction of tetraborane(10) with trimethylphosphine in tetrahydrofuran

When tetraborane(10) was treated with trimethylphosphine in a 1:1 molar ratio in tetrahydrofuran at -90 to -70°C, (CH3)3P·BH3, THF·B3H7, and H2B(THF)2+B3H8 - were produced. The formation of (CH3)3P·B3H7 was minimal. The same reaction was performed in dimethyl ether, diethyl ether, and dichloromethane, and the patterns of product distribution were compared with each other. The previously proposed mechanism for the B4H10 cleavage reactions was used to explain the observed results by taking the effects of concentrations and strength of the reacting bases into consideration. This mechanistic model explained also the results of the reactions of B4H10 with trimethylamine and phosphine in tetrahydrofuran. The values of 4 ± 1 and 0.41 ± 0.02 were obtained as the equilibrium constants for (CH3)3P·BH3 + THF·B3H7 ? THF·BH3 + (CH3)3P·B3H7 at 25°C and H3P·BH3 + THF·B3H7 ? THF·BH3 + H3P·B3H7 at 0°C, respectively.