Process for the preparation of 5,6-dihydro-2H-thiopyran-3-carbox

Details Process for the preparation of 5,6-dihydro-2H-thiopyran-3-carbox Process for the preparation of 5,6-dihydro-2H-thiopyran-3-carbox

1985-07-25

1987-06-02

Jiles, Henry R.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D33502

Patent

active

046705678

ABSTRACT:
5,6-Dihydro-2H-thiopyran-3-carboxaldehydes of the formula ##STR1## where R denotes hydrogen or methyl, are prepared by a method in which acrolein or crotonaldehyde is reacted with hydrogen sulfide in a mineral oil whose boiling point is higher than those of the starting materials and of the end product, and the 5,6-dihydro-2H-thiopyran-3-carboxaldehyde is obtained by distillation. These aldehydes are important intermediates for the preparation of some crop protection agents.

REFERENCES:
patent: 3733336 (1973-05-01), Wagner et al.
patent: 4289777 (1981-09-01), Albrecht et al.
patent: 4438282 (1984-03-01), Lardon et al.
J. Chem. Soc., 1941, 404-408.
J. Org. Chem., 42, 2123-2126 (1977).
J. Chem. Soc., 1951, 2123-2125.
Z. Lebensm. Unters. Forsch, 170-34-35 (1980).

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