Hexamethyldisilazane → Hexamethyldisilazane

HRID 236424Notes

Reaction equation

HRID 236424 reaction equation
[Cl-].[NH4+:2].[NH2-].[Na+:4].[CH3:5][Si:6]([NH:9][Si:10]([CH3:13])([CH3:12])[CH3:11])([CH3:8])[CH3:7]>C1C=CC=CC=1>[CH3:5][Si:6]([N-:9][Si:10]([CH3:13])([CH3:12])[CH3:11])([CH3:8])[CH3:7].[Na+:4].[NH2-:2].[Na+:4].[CH3:5][Si:6]([NH:9][Si:10]([CH3:13])([CH3:12])[CH3:11])([CH3:8])[CH3:7]

Participants

7

Reactant 3

HCID 13838HexamethyldisilazaneHCID 24533Sodium amideHCID 25517Ammonium Chloride

Product 3

HCID 13838HexamethyldisilazaneHCID 24533Sodium amideHCID 2724254Sodium bis(trimethylsilyl)amide

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent

Procedure

The chemistry of the final HMDS filtrate treatment step is complex. The reactions occurring in the final amide treatment and distillation steps are, however, not fully understood. Thus, the following description should be understood as presently incomplete and partly hypothetical. In liquid anhydrous ammonia, sodium amide reacts rapidly with ammonium chloride to form ammonia and sodium chloride according to the formula: ##STR1## This reaction proceeds slowly, if at all, in HMDS. The ammonium chloride appears to react with a reaction product formed when crude HMDS is "treated" with sodium amide. In this regard, literature reports that sodium bis(trimethylsilyl)amide is formed from the reaction of sodium amide and HMDS in benzene as follows: ##STR2## This reaction proceeds moderately at 25°-30° C. with evolution of ammonia without benzene as a solvent.

Workup

  1. customto react with a reaction product
  2. customformed when crude HMDS

Sources & evidence

ORD record
ord-21ffdfdd15734c3ea56443603e78848e
Source dataset
uspto-grants-1987_02
Patent number
US04644076

Reaction notes

Loading…