Ammonia → 2,2,4,4,6,6-Hexamethylcyclotrisilazane

HRID 129220

Reaction equation

C[Si](C)(Cl)Cl.N.C[Si]1(C)[NH:15][Si:14]([CH3:17])([CH3:16])[NH:13][Si:12]([CH3:19])([CH3:18])[NH:11][Si:10]([CH3:21])([CH3:20])N1>>[CH3:21][Si:10]1([CH3:20])[NH:11][Si:12]([CH3:18])([CH3:19])[NH:13][Si:14]([CH3:16])([CH3:17])[NH:15]1

Participants

Reactant 3

HCID 222Ammonia

HCID 6398Dichlorodimethylsilane

HCID 661002,2,4,4,6,6,8,8-Octamethylcyclotetrasilazane

Product 1

HCID 660942,2,4,4,6,6-Hexamethylcyclotrisilazane

Procedure

The starting octamethylcyclotetrasilazane should effectively be one which is secondarily produced when hexamethylcyclotrisilazane is prepared by reaction between dimethyl dichlorosilane and ammonia. Using such secondarily produced octamethylcyclotetra-silazane, the amount of hexamethylcyclo-trisilazane formed per unit starting material can be maximized. At the same time, some technical problems can be solved including elimination or treatment of octamethylcyclo-tetrasilazane in the form of a solid (melting point of 97° C.) which is left in the distillation column after removal of hexamethylcyclo-trisilazane by distillation.

Sources & evidence

ORD record: ord-182de51c6f4341229b903c3d23e615e8
Source dataset: uspto-grants-1995_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05466847

Linked notes

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