Patent · US Expired

Process for the preparation of 5,6-dihydro-2H-thiopyran-3-carboxaldehyde derivatives wherein the reactions are conducted in a high boiling mineral oil without a catalyst

US4670567A · kind A · utility

0Cited by

3References

7Claims

0Family size

Assignee

BASF SE

Inventors

Manfred Sauerwald · Meckenheim, DE
Toni Dockner
Wolfgang Rohr · Mannheim, DE
Gernot Reissenweber · Haßloch, DE

Key dates

Filing date	Jul 25, 1985
Grant date	Jun 2, 1987
Priority date	—
Expiry date	Jul 25, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D335/02
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.