Process for the preparation of cis-syn-cis-4,4' (5')-[di-t-butyl

Details Process for the preparation of cis-syn-cis-4,4' (5')-[di-t-butyl Process for the preparation of cis-syn-cis-4,4' (5')-[di-t-butyl

1994-11-03

1995-12-26

Dentz, Bernard

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D32300

Patent

active

054789532

ABSTRACT:
A process for preparing 4,4'(5')-[di-t-butyldicyclohexano]-18-crown-6 containing an enhanced amount of an isomer that extracts strontium ions from aqueous solution is disclosed. According to the process, an anhydrous reaction mixture is prepared containing 4,4'(5')-[di-t-butyldibenzo]-18-crown-6 as substrate dissolved in a C.sub.2 -C.sub.6 alcohol-containing solvent that can also contain benzene, toluene or xylene, a C.sub.2 -C.sub.6 carboxylic acid or anhydride and a 5 percent of rhodium on alumina particle catalyst. The resulting reaction medium is hydrogenated at about 200-1000 psi, at a temperature of about 35.degree.-120.degree. C. for a time period sufficient to reduce at least 90 percent of the substrate.

REFERENCES:
patent: 3687978 (1972-08-01), Pedersen
patent: 5082955 (1992-01-01), Lemaire et al.
patent: 5100585 (1992-05-01), Horivitz et al.
patent: 5110474 (1992-05-01), Horivitz et al.
patent: 5346618 (1994-09-01), Horivitz et al.

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