Process for the preparation of .alpha.,.beta.-dihaloalkyl isocya

Details Process for the preparation of .alpha.,.beta.-dihaloalkyl isocya Process for the preparation of .alpha.,.beta.-dihaloalkyl isocya

1979-10-18

1981-03-24

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453AP, 260453AL, 260453AR, C07C119042, C07C119045, C07C119048

Patent

active

042579740

ABSTRACT:
.alpha.,.beta.-Dihaloalkyl isocyanates and a process for the preparation of such compounds by reacting .alpha.,.beta.-unsaturated alkyl isocyanates with halogen in the presence of an organic solvent which is inert under the reaction conditions, at from -35.degree. to +90.degree. C. The .alpha.,.beta.-dihaloalkyl isocyanates thus obtainable correspond to the formula ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are identical or different and each is hydrogen, a saturated aliphatic radical of 1 to 10 carbon atoms, a cycloaliphatic radical of 3 to 12 carbon atoms, an araliphatic radical of 7 to 11 carbon atoms or an aromatic radical of 6 to 10 carbon atoms, or R.sup.1 and R.sup.2 together with the carbon atom on which they are present as substituents are cycloalkyl of 3 to 7 ring members, and X is halogen. The compounds are valuable intermediates for the preparation of dyes, surface-coating intermediates, crop protection agents and drugs.

REFERENCES:
patent: 3468923 (1969-09-01), Koenig et al.
patent: 3472886 (1969-10-01), Harper et al.
patent: 3535360 (1970-10-01), Holtschmidt et al.
patent: 3862201 (1975-01-01), Koenig et al.

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