Multiple-step process for the preparation of 3-isocyanatomethyl-

Details Multiple-step process for the preparation of 3-isocyanatomethyl- Multiple-step process for the preparation of 3-isocyanatomethyl-

1984-04-13

1986-06-24

Siegel, Alan

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

Organic compounds

Isocyanate esters

C07C 6900

Patent

active

045966796

ABSTRACT:
This invention discloses a non-phosgene process for the preparation of 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate by the reaction of the precursor diamine with urea and an aliphatic alcohol in the presence of a dialkyl carbonate and an alkyl carbonate. The intermediate diurethane is separated from starting materials and by-products and thermally cleaved to alcohol and diisocyanate which are separated by fractional condensation of the products from the vapor state. This process gives high yields of the desired diisocyanate and lends itself particularly to continuous processing.

REFERENCES:
Wagner & Zook, Synthetic Org. Chem. (1965) p. 647.
Sandler, Org. Functional Group Prep., vol. 2-II (1971) p. 244.

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