Process for the preparation of hemiaminals, and the use thereof
AssigneeCiba-Geigy Corporation
InventorRobert W. Lang
Life of this patent
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Abstract
The reaction of dimethylformamide, R.sup.1 R.sup.2 R.sup.3 SiX and RY in the presence of zinc or the reaction of dimethylformamide, R.sup.1 R.sup.2 R.sup.3 SiX and a zinc compound RZnY.yL affords hemiaminals of formula I ##STR1## R is e.g. polyhalogenated alkyl containing at least one fluorine atom; R.sup.1, R.sup.2 and R.sup.3 are e.g. alkyl; L is a ligand; X is chlorine or bromine; Y is chlorine, bromine or iodine and y is 1 or 2.
Claims13
A process for the preparation of a hemiaminal of formula I ##STR4## wherein R is unsubstituted or substituted polyhalogenated alkyl, cycloalkyl or aralkyl containing at least one fluorine atom and R.sup.1, R.sup.2 and R.sup.3 are each independently a hydrogen atom, alkyl, cycloalkyl or aryl, which process comprises
- (a) reacting with one another at least equimolar amounts of dimethylformamide, a silane of formula II
- R.sup.1 R.sup.2 R.sup.3 SiX (II)
- wherein X is chlorine or bromine and R.sup.1, R.sup.2 and R.sup.3 are as defined above, and a compound of formula III
- RY (III)
- wherein R is as defined above and Y is chlorine, bromine or iodine, in the presence of zinc, or
- (b) reacting with one another at least equimolar amounts of dimethylformamide, a silane of formula II and a zinc compound of formula IV
- RZnY.yL (IV)
- wherein R and Y are as defined above, L is a ligand and Y is 1 or 2.
A hemiaminal of formula I ##STR5## wherein R is unsubstituted or substituted polyhalogenated alkyl, cycloalkyl or aralkyl containing at least one fluorine atom and R.sup.1, R.sup.2 and R.sup.3 are each independently a hydrogen atom, alkyl, cycloalkyl or aryl.
Dependencies are inferred from the claim text.