381-59-9

Basic information

• Product Name: methyl borodifluoridate
• Synonyms: Methoxydifluoroborane; Methyl borodifluoridate
• CAS NO: 381-59-9
• Molecular Formula: CH₃BF₂O
• Molecular Weight: 79.8417
• Mol File: 381-59-9.mol
• Article Data: 1

Chemical Properties

• Density: 0.947g/cm³
• Vapor Pressure: 6870mmHg at 25°C
• Refractive Index: 1.227
• CAS DataBase Reference: methyl borodifluoridate(CAS DataBase Reference)
• NIST Chemistry Reference: methyl borodifluoridate(381-59-9)
• EPA Substance Registry System: methyl borodifluoridate(381-59-9)

Safety Data

• Hazardous Substances Data: 381-59-9(Hazardous Substances Data)

Upstream product

• 186808-85-5 C₃H₈FO₃Si^(1-) 
• 7637-07-2 boron trifluoride 
• 121-43-7 Trimethyl borate 
• 124-41-4 sodium methylate 
• 27109-34-8 WF₄(OCH₃)2 
• 367-46-4 fluorodimethoxyborane 
• 353-42-4 boron trifluoride dimethyl etherate 

Downstream Products

• 1092538-47-0 boron trifluoride amine 
• 121-43-7 Trimethyl borate 
• 7637-07-2 boron trifluoride 
• 367-46-4 fluorodimethoxyborane 
• 7664-39-3 hydrogen fluoride 
• 13460-50-9 metaboric acid 

Relevant articles and documents

Experimental and theoretical characterization of FSi(OCH3)2(OCH2)-: A gas phase fluoride-siloxirane adduct

The structural characteristics and reactivity of the gas-phase FSi(OCH3)2(OCH2)- ion were investigated by a combination of ab initio calculations and FT-ICR techniques. The theoretical calculations for different possible structures reveal that carbanion and alkoxide ion type structures lead to ring closure upon geometry optimization to yield two different cyclic fluoride-siloxirane structures. The FSi(OCH3)2(cyc-OCH2)- ions containing the elusive siloxirane ring are estimated to be extremely stable with respect to F- (69 kcal mol-1) dissociation in agreement with earlier calculations on simpler systems. Experimentally, this ion is formed as a minor product (7%) in the gas-phase ion/molecule reaction of F- with Si(OMe)4 and is observed to undergo readily fluoride transfer to the parent neutral. This strongly suggests an ion with a structure corresponding to a fluoride adduct of a siloxirane species. Reaction of FSi(OCH3)2(OCH2)- with BF3, hexafluorobenzene, and gas-phase acids more acidic than ethanol further suggests that this ion is capable of reacting as an alkoxide type nucleophile or base. This latter behavior has been associated with the possibility of ring opening of the siloxirane in the collision complex that mediates this ion/molecule reaction.