Process for the preparation of polyalkyl-1-oxa-diazaspirodecane

Details Process for the preparation of polyalkyl-1-oxa-diazaspirodecane Process for the preparation of polyalkyl-1-oxa-diazaspirodecane

1995-02-16

1996-08-27

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

525403, C07D49810

Patent

active

055502423

ABSTRACT:
The invention relates to a process for the preparation of polyalkyl-1-oxa-diazaspirodecane compounds, which can be used as highly active light stabilizers for polymers. The reaction is carried out in an inert organic solvent in the presence of solid alkali metal hydroxide or of the corresponding amount of a mixture of solid alkali metal hydroxide and water as the sole catalyst. The process offers the advantage that, by changing the reaction procedure in a multiphase system and avoiding the use of a phase transfer catalyst, equally good results are achieved with regard to product quality and yield. Additionally, it is possible to reduce the reaction time from over 6 hours to 30 minutes. This results in a considerable rise in the space-time yield and consequently contributes, in addition, to an increase in the economy of the process of the invention.

REFERENCES:
patent: 4107139 (1978-08-01), Mayer et al.
patent: 4110334 (1978-08-01), Mayer et al.
patent: 4771091 (1988-09-01), Ertl
patent: 5169925 (1992-12-01), Schmailzl et al.
Schmailzl et al., Chemical Abstracts, vol. 115 (1991) 10158q.

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