Preparation of vinyl ethers

Details Preparation of vinyl ethers Preparation of vinyl ethers

1990-08-09

1992-07-14

Gray, Bruce

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546259, 546266, 546283, 546284, 546290, 546303, 546339, 546343, 549 14, 549 59, 549 60, 549 62, 549 78, 549497, 568579, 568631, 568640, 568647, 568658, 568661, 568664, 568662, 568691, C07D40100

Patent

active

051304350

ABSTRACT:
Vinyl ethers of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are identical to or different from one another, each being hydrogen, straight-chain or branched alkyl or alkenyl of up to 12 carbon atoms, cycloalkyl or cycloalkylene of from 5 to 8 carbon atoms, aryl, alkylaryl, alkenylaryl, aralkyl and aralkenyl of from 6 to 16 carbon atoms, halogen-substituted aryl or heterocyclyl, and in addition the radicals R.sup.1 and R.sup.2 or R.sup.1 and R.sup.3, together with the carbon atom to which they are bonded, can form a cycloalkane, cycloalkene or a heterocycle, and R.sup.4 is alkyl, alkylaryl or aralkyl, are prepared by eliminating an alcohol from an acetal/ketal of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each as defined above, in the presence of a phosphate of zeolite structure and/or a precipitated phosphate of the elements B, Zr, Ce or Fe and/or phosphoric acid or boric acid on carrier material and/or acidic undoped metal oxide as catalyst, the reaction being preferably carried out in the gas phase.

REFERENCES:
patent: 3705924 (1972-12-01), Smith et al.
patent: 4310440 (1982-01-01), Wilson et al.
patent: 4440871 (1984-04-01), Lok et al.
patent: 4473663 (1984-09-01), Patton et al.
patent: 4960954 (1990-10-01), Hoelderich et al.
Chemical Abstract, "The Catalytic Decomposition of Acetals by Metallic Oxides", vol. 24, No. 15 (Aug. 10, 1930).

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