Preparation of dihalovinyl compounds
AssigneeShell Oil Company
InventorPetrus A. Kramer
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Abstract
A process for the preparation of dihalovinyl compounds of the formula ##STR1## wherein each Hal is fluorine, chlorine or bromine, R.sup.1 is an optionally substituted hydrocarbyl group, R.sup.2 is a methyl group or a hydrogen atom, or R.sup.1 and R.sup.2 together with the carbon atom to which they are attached form cycloalkylidene group, which process comprises treating a trihalo compound of the formula ##STR2## wherein Hal, R.sup.1 and R.sup.2 have the above meanings and R.sup.3 is a hydrogen atom or ##STR3## in which M is an alkali atom, with PHal.sub.3.
Claims9
A process for the preparation of a 2,2-dihalovinyl compound of the formula:
- ##STR7## wherein R.sup.1 represents a 2'-(2,2-dimethoxyethyl)-3',3'-dimethylcyclopropyl group, a 2'-(2-oxopropyl)-3',3'-dimethylcyclopropyl group or a 2'-(alkoxycarbonyl)-3,3-dimethylcyclopropyl group in which the alkoxy group contains from 1 to 10 carbon atoms;
- R.sup.2 represents a hydrogen atom;
- and each Hal is selected from fluorine, chlorine or bromine, which process comprises reacting a trihalo compound of the formula:
- ##STR8## wherein R.sup.1 and R.sup.2 have the same meaning as in formula I, at least one Hal is bromine, the other Hal's having the same meaning as in formula I, and R.sup.3 is hydrogen, or ##STR9## wherein M is an alkali metal atom, with PHal.sub.3, wherein Hal is selected from bromide and chlorine.
Dependencies are inferred from the claim text.