Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3591663A
Inventor
Matthias Seefelder
Hans-Gerhard Reppe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Badische Anilin and Sodafabrik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE, Badische Anilin and Sodafabrik AGfiledCriticalBASF SE
Priority to GB3591663ApriorityCriticalpatent/GB985157A/en
Publication of GB985157ApublicationCriticalpatent/GB985157A/en
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
4,5-Dihydrouracil is produced by reacting acrylic acid with urea in sulphuric acid as solvent, at a temperature between 100 DEG and 250 DEG C., diluting the reaction mixture with water and separating the 4,5-dihydrouracil. The sulphuric acid may be of 90 to 100% concentration by weight and the ratio by weight of sulphuric acid to urea is between 2: 1 and 1: 1. The ratio by weight of acrylic acid and urea may be between 0.2: 1 and 1: 1. Air is preferably excluded from the reaction which is carried out at a pressure of 0.5 to 10 atmospheres gauge, either by the intrinsic reaction pressure or by using inert gases, e.g. nitrogen or nitrogen monoxide.
GB3591663A1963-09-121963-09-12Production of 4,5-dihydrouracil
ExpiredGB985157A
(en)