Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
A process for the preparation of a tertiary alkyl cyanide of the formula ##STR31## in which R 1 , R 2 and R 3 each independently is an alkyl group or, together with the tertiary carbon atom to which they are bonded, form a polycycloalkyl group, or R 1 and R 2 , together with the tertiary carbon atoms to which they are bonded, form a cycloalkyl group or a bicycloalkyl group, comprising reacting a tertiary alkyl halide of the formula ##STR32## in which X is a chlorine, bromine or iodine atom, with trimethylsilyl cyanide of the formula (CH 3 ) 3 SiCN in the presence of a Lewis acid selected from the group consisting of SnCl 4 , TiCl 4 and BiCl 3 .
Claim 2
Dependent Claim
125 words
A process for the preparation of a tertiary alkyl cyanide of the formula ##STR31## in which R 1 , R 2 and R 3 each independently is an alkyl group or, together with the tertiary carbon atom to which they are bonded, form a polycycloalkyl group, or R 1 and R 2 , together with the tertiary carbon atoms to which they are bonded, form a cycloalkyl group or a bicycloalkyl group, comprising reacting a tertiary alkyl halide of the formula ##STR32## in which X is a chlorine, bromine or iodine atom, with trimethylsilyl cyanide of the formula (CH 3 ) 3 SiCN in the presence of a Lewis acid selected from the group consisting of SnCl 4 , TiCl 4 and BiCl 3 .
Claim 3
Dependent Claim
21 words
A process according to claim 1, wherein the reaction is carried out at a temperature between about 10° and 40° C.
Claim 4
Dependent Claim
23 words
A process according to claim 1, wherein about 1 to 1.8 mols of trimethylsilyl cyanide are employed per mol of tertiary alkyl halide.
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein about 10 to 40 mol% of the Lewis acid is employed per mol of tertiary alkyl halide.
Claim 6
Dependent Claim
15 words
A process according to claim 1, wherein SnCl 4 is employed as the Lewis acid.
Claim 7
Dependent Claim
18 words
A process according to claim 1, wherein the reaction is carried out in the presence of a diluent.
Claim 8
Dependent Claim
22 words
A process according to claim 6, wherein the diluent is a chlorinated hydrocarbon free from chlorine bonded to a tertiary carbon atom.
Claim 9
Dependent Claim
15 words
A process according to claim 6, wherein dichloromethane or 1,2-dichloroethane is used as the diluent.
Claim 10
Dependent Claim
86 words
A process according to claim 1, in which R 1 , R 2 and R 3 each independently is an alkyl group having 1 to 10 carbon atoms, or, together with the tertiary carbon atoms to which they are bonded, form a polycycloalkyl group having up to 20 carbon atoms; or R 1 and R 2 together with the carbon atom to which they are bonded, form a cycloalkyl group having 3 to 12 carbon atoms or a bicycloalkyl group having 6 to 10 carbon atoms.
Claim 11
Dependent Claim
16 words
A process according to claim 1, wherein the tertiary alkyl halide is a tertiary alkyl chloride.
Claim 12
Dependent Claim
14 words
A process according to claim 1, wherein the tertiary alkyl halide is tert.-butyl chloride.
Claim 13
Dependent Claim
62 words
A process according to claim 11, wherein about 1.2 to 1.6 mols of trimethylsilyl cyanide and 20 to 30 mol % of the Lewis acid are employed per mol of tertiary alkyl halide, SnCl 4 is employed as the Lewis acid, and the reaction is carried out at about 15° to 25° C. in the presence of dichloromethane or 1,2-dichloroethane as diluent.