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Preparation of unsaturated and saturated ketones
| Details |
Inventors: Hoelderich, Wolfgang; Hupfer, Leopold; Schneider, Kurt;
Assignee: BASF Aktiengesellschaft (Ludwigshafen, DE)
Primary Examiner: Reamer; James H.
Assistant Examiner:
Attorney, Agent or Firm: Keil & Weinkauf
Unsaturated ketones of the formula ##STR1## and saturated ketones of the formula ##STR2## where R.sup.1, R.sup.2 and R.sup.3 are each hydrogen, alkyl of 1 to 12 carbon atoms or a cycloalkyl, aryl, aralkyl or alkylaryl radical which inturn may be substituted, or R.sup.1 and R.sup.3 or R.sup.2 and R.sup.3, together with the carbon atoms to which they are bonded, may form a cycloalkane, are prepared by a process in which a 5-methylene-1,3-dioxolanone which is substituted in the 4-position and is of the forumla ##STR3## where R.sup.1, R.sup.2 and R.sup.3 have the above meanings, (a) for the preparation of an unsaturated ketone, is converted in the presence of a zeolite, of a phosphate having a zeolite structure and/or of B, Ce, Fe, Zr or Sr phosphate as catalysts and (b) for the preparation of a saturated ketone, is converted in the presence of the same catalysts which additionally carry one or more hydrogenation components. |
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DETAILED DESCRIPTION We claim: 1.
A process for the preparation of an unsaturated ketone of the formula (I) ##STR9## or a saturated ketone of the formula (II) ##STR10## where R.
sup.
1, R.
sup.
2 and R.
sup.
3 are each hydrogen, alkyl of 1 to 12 carbon atoms or a cycloalkyl, aryl, aralkyl or alkylaryl radical, or R.
sup.
1 and R.
sup.
3 or R.
sup.
2 and R.
sup.
3, together with the carbon atoms to which they are bonded, may form a cycloalkane, wherein a 5-methylene-1,3-dioxolanone which is substituted in the 4-position and is of the formula (III) ##STR11## where R.
sup.
1, R.
sub.
2 and R.
sup.
3 have the above meanings, (a) for the preparation of an unsaturated ketone (I), is converted in the gas phase at a temperature of from 100.
degree.
to 500.
degree.
C.
in a fixed or fluidized catalyst bed, or in the liquid phase at a temperature of from 50.
degree.
to 200.
degree.
C.
in the presence of a zeolite and/or of a B, Ce, Fe, Zr or Sr phosphate as catalysts and (b) for the preparation of a saturated ketone (II), is converted in the gas phase at a temperature of from 100.
degree.
to 500.
degree.
C.
in a fixed or fluidized catalyst bed, or in the liquid phase at a temperature of from 50.
degree.
to 200.
degree.
C.
in the presence of hydrogen over a zeolite and/or a B, Ce, Fe, Zr or Sr phosphate, which carries one or more hydrogenation components, as catalysts.
2.
The process of claim 1, wherein the catalyst used is a zeolite of the pentasil type, which may furthermore carry a hydrogenation component.
3.
The process of claim 1, wherein the catalyst used is an aluminum silicate zeolite of the faujasite type, which may furthermore carry a hydrogenation component.
4.
The process of claim 1, wherein a hydrothermally prepared aluminum phosphate or silicon aluminum phosphate or silicon iron aluminum phosphate or iron aluminum phosphate or boron aluminum phosphate, which may furthermore carry a hydrogenation component, is used as the zeolite.
5.
The process of claim 1, wherein R.
sup.
1, R.
sup.
2 and R.
sup.
3 are each hydrogen, methyl or ethyl
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