Pentaborane

Base Information

• Chemical Name: Pentaborane
• CAS No.: 19624-22-7
• Molecular Formula: B5H9
• Molecular Weight: 63.1265
• Mol file: 19624-22-7.mol

Synonyms:Borane(B5H9); Boron hydride (B5H9); Nonahydropentaborane; Pentaborane; Pentaborane(B5H9)

Chemical Property of Pentaborane

Chemical Property:

• Melting Point: -46.6°
• Boiling Point: bp 60°
• PSA: 0.00000
• Density: d40 0.61
• LogP: -3.51020
• Water Solubility.: hydrolyzed if heated [COT88]

Purity/Quality:

Safty Information:

• Pictogram(s): Highly flammable, dangerous fire and explosion risk. Toxic by ingestion and inhalation, strong irritant. TLV: 0.005 ppm; STEL 0.013 ppm.
• Hazard Codes: Highly flammable, dangerous fire and explosion risk. Toxic by ingestion and inhalation, strong irritant. TLV: 0.005 ppm; STEL 0.013 ppm.

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Description: Pentaborane is a nonmetallic, colorless liquid with a pungent odor. It decomposes at 300°F (148°C), if it has not already ignited, and will ignite spontaneously in air if impure. It is a dangerous fire and explosion risk, with a flammable range of 0.46%–98% in air. Boiling point is 145°F (64°C), flash point is 86°F (30°C), and ignition temperature is 95°F (35°C), which is extremely low. Any object that is 95°F (35°C) or above can be an ignition source. Ignition sources can be ordinary objects on a hot day in the summer, such as the pavement, metal on vehicles, and even the air. In addition to extreme flammability, it is also toxic by ingestion or inhalation and is a strong irritant. TLV is 0.005 ppm in air, and it is immiscible in water. The four-digit UN identification number is 1380. The NFPA 704 designation for pentaborane is health 4, flammability 4, and reactivity 2. The primary uses are as fuel for air-breathing engines and as a propellant.
• Uses: There appears to be no commercial market for pentaborane. In the 1950s it was explored as a potential rocket fuel. Reducing agent in propellant fuels

Technology Process of Pentaborane

There total 119 articles about Pentaborane which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield: 99.0%

2,3-μ-(Cp2ClZr)B5H8 → zirconocene dichloride (1291-32-3) + pentaborane(9) (19624-22-7)

Guidance literature:

With HCl;

Reference yield: 95.0%

hydrogenchloride (7647-01-0,15364-23-5) + [2,3-μ-(Cp2ClZr)B5H8] → zirconocene dichloride (1291-32-3) + pentaborane(9) (19624-22-7)

Guidance literature:

In diethyl ether; on standard vac. line; Et2O condensed at -78°C onto Zr complex; cooled to -196°C; HCl gas (1 equiv.) condensed onto frozen mass; warmed to -55°C; stirred for 90 min; volatiles removed in vac. at -55°C; coolected at -196°C over 18 h; detd. by (1)H, (13)C and (11)B NMR spectroscopy;

DOI:10.1021/ic010665h

Reference yield: 25.0%

1-I-B5H8 (30624-33-0) → pentaborane(9) (19624-22-7) + 2-methoxypentaborane(9) (23556-01-6) + Trimethyl borate (121-43-7,63156-11-6)

Guidance literature:

With (CH₃)2O; In Dimethyl ether; byproducts: CH3I, HB(OCH3)2, H2; at -12°C, 15h;;

DOI:10.1021/ja01033a040

upstream raw materials:

diborane

hydrogen

boron trichloride

hydrogenchloride

Downstream raw materials:

trimethylamine-borane

nido-decaborane

hexaborane⁽¹⁰⁾

pentaborane⁽¹¹⁾

Refernces

• 1、 Greenwood, Norman N.,Staves, John. "". . . Retrieved 1977.
• 2、 Kravchenko,Kalinnikov,Shilkin. "Chemical and phase transformations in the systems hydrogen-sorbing intermetallic compound-diborane". . p. 865 - 867. Retrieved 2007/10/03.
• 3、 Thomas, Rhodri Ll.,Rath, Nigam P.,Barton, Lawrence. "Formation of metallaboranes from the group IV transition metals and pentaborane(9): Crystal and molecular structure of [(Cp2Zr)2B5H8] [B11H14]". . p. 67 - 75. Retrieved 2008/10/08.