Process for the preparation of substantially pure cyclo aliphati

Details Process for the preparation of substantially pure cyclo aliphati Process for the preparation of substantially pure cyclo aliphati

1979-10-15

1981-02-10

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453A, 528 45, 528 48, C07C119045

Patent

active

042501067

ABSTRACT:
The instant invention is directed to a novel process for the separation of substantially pure cycloaliphatic diisocyanate reactive (cis-form) stereoisomers from cycloaliphatic diisocyanate non-reactive (trans-form) stereoisomers comprising reacting cycloaliphatic diisocyanates of the formula ##STR1## where R can be hydrogen or an aliphatic hydrocarbon group having from 1 to 4 carbon atoms, at least one of said R's being an aliphatic hydrocarbon having from 1 to 4 carbon atoms and wherein the isocyanato groups are both positioned axially or equatorially in the presence of catalysts selected from the group consisting of lead catalysts, tertiary amines, alkali metal hydroxides and sodium methoxide, thereby producing a cyclic nylon-1 type linear polymer having regularly reoccurring bicyclic structural units of the formula ##STR2## precipitating said cyclic nylon-1 type linear polymers, filtering and washing said precipitated cyclic nylon-1 type linear polymers, then decomposing said precipitated polymer using distillation, thereby producing a distillate and collecting said distillate containing a substantially pure monomer consisting of reactive (cis-form) stereoisomers. The instant invention also relates to the novel process outlined above wherein the decomposition by distillation is performed under conditions of reduced pressure.

REFERENCES:
patent: 2965614 (1960-12-01), Shashoua
patent: 3048566 (1962-08-01), Beaman
patent: 3163624 (1964-12-01), Black et al.
patent: 3450676 (1969-06-01), Grogler et al.
patent: 3644459 (1972-02-01), Cross
Corfield et al., Chemical Communications, No. 4, pp. 85-86, (1966).

Affiliated with

Also associated with

Rating

Process for the preparation of substantially pure cyclo aliphati does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of substantially pure cyclo aliphati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of substantially pure cyclo aliphati will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1665107