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

1997-01-14

Shah, Mukund J.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548225, 528367, C07D49810

Patent

active

055941427

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 a solvent mixture of at least one alcohol and if appropriate an inert organic solvent in the presence of solid alkali metal hydroxide or a corresponding amount of a mixture of solid alkali metal hydroxide and water as the sole catalyst. The process offers the advantage that, by using a solvent mixture and dispensing with a phase transfer catalyst, a higher rate of reaction and therefore higher product quality with the same yield are achieved. By dispensing with a phase transfer catalyst, which remains in the waste water and must be disposed of expensively, and by the reusability of the solvent mixture, the process is more environment-friendly and more economical than processes known to date.

REFERENCES:
patent: 4771091 (1988-09-01), Ertl
patent: 5169925 (1992-12-01), Schmailzl et al.
March, J. Advanced Organic Chemistry (John Wiley, New York), p. 391 (1992).
Pascal, J. et al. J. Med. Chem. 28, 647-652 (1985).
Bernauer, K. et al. Helvetica Chimica Acta 76, 2263-2273 (Oct. 1993).

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