Process for the preparation of aromatic carbonic diesters
First Claim
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1. Process for the preparation of carbonic diesters containing at least one aromatic ester group from carbonic diesters containing at least one aliphatic ester group by catalysed transesterification with a phenol, characterised in that the catalyst used is a titanium dioxide having a surface area of at least 90 m2 /g as determined by the BET method in an amount of 0.1 to 200% by weight, relative to the carbonic diester used, which contains at least one aliphatic ester group.
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Abstract
Carbonic diesters containing at least one aromatic ester group can be prepared from carbonic diesters containing at least one aliphatic ester group by transesterification using a phenol, titanium dioxide having a surface area of at least 20 m2 /g as determined by the BET method being used as catalyst.
41 Citations
10 Claims
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1. Process for the preparation of carbonic diesters containing at least one aromatic ester group from carbonic diesters containing at least one aliphatic ester group by catalysed transesterification with a phenol, characterised in that the catalyst used is a titanium dioxide having a surface area of at least 90 m2 /g as determined by the BET method in an amount of 0.1 to 200% by weight, relative to the carbonic diester used, which contains at least one aliphatic ester group.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- 4. Process according to claim 2, characterised in that the carbonic diesters contain at least one aliphatic ester group of the formula
- space="preserve" listing-type="equation">R.sup.3 O--CO--OR.sup.4
in which R3 and R4, independently of one another, denote straight-chain or branched C1 -C8 -alkyl, cyclopropyl, cyclopentyl or cyclohexyl, in which furthermore R3 can denote substituted or unsubstituted phenyl.
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5. Process according to claim 1, characterised in that a phenol of the formula ##STR6## in which R5 denotes hydrogen, C1 -C4 -alkyl, C2 -C4 -alkenyl, C1 -C4 -alkoxy, C5 -C6 -cycloalkyl, phenyl, fluorine, chlorine, bromine or cyano;
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R6 represents hydrogen C1 -C4 -alkyl, C2 -C4 -alkenyl, C1 -C4 -alkoxy, fluorine, chlorine, bromine and R7 represents hydrogen, C1 -C4 -alkyl or the group ##STR7## in which X denotes a single bond, --CH2 --, C2 -C5 -cycloalkylidene, oxygen, sulphur, --CO--, --SO-- or --SO2 --, in which R6 and R7 together can also denote a fused benzene ring, is used for transesterification.
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6. Process according to claim 1, characterised in that a phenol of the formula ##STR8## in which R8 and R9, independently of one another, denote hydrogen, C1 -C4 -alkyl or chlorine, is used.
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7. Process according to claim 1, characterised in that the phenol is a bisphenol of the formula ##STR9## in which R10 and R11, independently of one another, can denote hydrogen, C1 -C4 -alkyl, C2 -C4 -alkenyl, C1 -C4 -alkoxy, C5 -C6 -cycloalkyl, fluorine, chlorine or bromine, and
Y represents a single bond, --CH2 --, --C2 --H5 -alkylidene, C5 -C6 -cycloalkylidene, sulphur or --SO2 --. -
8. Process according to claim 1, characterised in that the reaction is carried out at a temperature of 50°
- -300°
C.
- -300°
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9. Process according to claim 1 wherein the catalyst is used in an amount of 2 to 50% by weight relative to the carbonic diester used.
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10. Process according to claim 1 wherein the reaction is carried out at a temperature of 100°
- -250°
C.
- -250°
Specification
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Current AssigneeBayer AG
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Original AssigneeBayer AG
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InventorsKischkewitz, Jurgen, Zirngiebl, Eberhard, Buysch, Hans-Josef, Schon, Norbert
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Primary Examiner(s)Dees, Jose G.
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Assistant Examiner(s)MACMILLAN, KEITH D
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Application NumberUS07/788,959Time in Patent Office1,069 DaysField of Search558/260, 558/270, 558/273, 558/274, 423/610US Class Current558/270CPC Class CodesC07C 68/06 from organic carbonatesC07C 69/96 Esters of carbonic or halof...
