21649-17-2

Basic information

• Product Name: tetraethyldiborane
• Synonyms: tetraethyldiborane
• CAS NO: 21649-17-2
• Molecular Weight: 137.869
• Mol File: 21649-17-2.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: tetraethyldiborane(CAS DataBase Reference)
• NIST Chemistry Reference: tetraethyldiborane(21649-17-2)
• EPA Substance Registry System: tetraethyldiborane(21649-17-2)

Safety Data

• Hazardous Substances Data: 21649-17-2(Hazardous Substances Data)

Upstream product

• 7318-94-7 tetramethoxydiborane 
• 97-93-8 triethylaluminum 

Downstream Products

• 22603-90-3 N-methyl-2-phenylethylaminoethylborane 
• 97-94-9 triethyl borane 
• 22603-89-0 N-methylbenzylaminoethylborane 
• 55482-87-6 Diaethyl-(cyclohexyl)-boran 
• 60218-08-8 2-Ethyl-4-(1-methylvinyl)-5-methyl-5-propyl-1,3,2-dioxaborinan 

Relevant articles and documents

Beitraege zur Chemie des Bors, 120. Tetraorganyldiborane(4): Darstellung und Stabilitaet

tert-Butylation of B2(OCH3)4 by LiC(CH3)3 proceeds via (CH3O)B-B(OCH3) (1) to give tri-tert-butylmethoxydiborane(4) (2).Tetraalkylation of B2(OCH3)4 is achieved by isopropyllithium; no reaction intermediates were found in this case.Al(C2H5)3 reacts with B2(OCH3)4 to give B2(C2H5)4 which is stable only below -30 deg C.On the other hand the CH3O group in 2 is replacable by CH3, and the CH3O groups in 1 by ethyl groups.Thus, product control by steric factors is evident.The thermal stability of tetraorganyldiboranes(4) is controlled by the steric screening of the boron atoms: tetraisopropyldiborane(4) decomposes slowly at room temperature, tetraethyldiborane(4) rapidly at -20 deg C.