-
公开(公告)号：CA1242197A
公开(公告)日：1988-09-20
申请号：CA484951
申请日：1985-06-24
Applicant: HOECHST AG
Inventor： PIEPER WERNER
IPC: C07D251/32 , C07D251/36
Abstract: PROCESS FOR MAKING CHLOROISOCYANURIC ACIDS Chloroisocyanuric acids are made by reacting an aqueous suspension of cyanuric acid while stirring with an alkali metal compound in the presence of chlorine gas between 0 and 40.degree.C at a pH of less than 7. More particularly, the reaction is effected in a system gas tightly sealed with respect to the outside; a chlorine gas atmosphere with pressure of more than 500 millibars is established above the continuously renewed (by agitation) surface of the cyanuric acid suspension, and the pressure is maintained; the alkali metal compound is an alkali metal hydroxide solution which is added to the cyanuric acid suspension at a rate sufficient for the resulting reaction mixture to always present a pH of less than 7. The process of invention obviates problems in known processes regarding the formation of gaseous by-products, foaming and the use of excess alkali metal compound.
-
公开(公告)号：DD239215A5
公开(公告)日：1986-09-17
申请号：DD28196485
申请日：1985-10-22
Applicant: HOECHST AG
Inventor： PIEPER WERNER , STAENDEKE HORST , ELSNER GEORG
-
公开(公告)号：DD207914A5
公开(公告)日：1984-03-21
申请号：DD24901183
申请日：1983-03-21
Applicant: HOECHST AG
Inventor： PIEPER WERNER , KRAUSE WERNER
Abstract: The disclosure relates to a process for making derivatives of vinylpyrophosphonic acid, wherein a ketone is reacted with tetraphosphorus hexoxide (P4O6) in the presence of a catalytically active proportion of a proton-yielding substance at elevated temperature. Vinylphosphonic acid derivatives are obtained by hydrolyzing the vinylpyrophosphonic acid derivatives with an equivalent proportion of water. More particularly, the ketone used is a compound of the following general formula in which either R stands exclusively for a halogen and R' either stands for a halogen or hydrogen, a halogen-substituted or unsubstituted alkyl, aryl, alkaryl or aralkyl group having from 1 to 18 carbon atoms, and R'' stands for an alkyl, aryl, alkaryl, aralkyl or alkenyl group having from 1 to 18 carbon atoms, or R'' stands exclusively for an alkenyl group having from 2 to 18 carbon atoms and R and R' being identical or different each stand for hydrogen or a halogen or a halogen-substituted or unsubstituted alkyl, aryl, alkaryl or aralkyl group having from 1 to 18 carbon atoms.
-
公开(公告)号：DD245877A5
公开(公告)日：1987-05-20
申请号：DD29032286
申请日：1986-05-16
Applicant: HOECHST AG
Inventor： PIEPER WERNER
Abstract: Novel mono- or dicarboxytetralinephosphonic acids of the general formula I in which R stands for hydrogen or an alkyl group, X stands for hydrogen or a carboxylic group, and Y stands for hydrogen or an alkyl group are made by reacting 1-phenylvinyl-1-phosphonic acid with an unsaturated carboxylic acid of formula II or with its anhydride.
-
公开(公告)号：DD212965A5
公开(公告)日：1984-08-29
申请号：DD25578283
申请日：1983-10-19
Applicant: HOECHST AG
Inventor： KRAUSE WERNER , PIEPER WERNER
IPC: C07F9/38
Abstract: The disclosure provides a novel process for making 1-hydroxyalkane-1-phosphonic acids by reacting an aldehyde with tetraphosphorus hexoxide.
-
Patent Agency Ranking
公开(公告)号：CA1277334C
公开(公告)日：1990-12-04
申请号：CA522975
申请日：1986-11-14
Applicant: HOECHST AG
Inventor： PIEPER WERNER
Abstract: PROCESS FOR MAKING PHOSPHONIC ACID DICHLORIDES Phosphonic acid dichlorides of the general formula I (I) are made by reacting thionyl chloride with a phosphonic acid dialkylester of the general formula II (II) and using, as the catalyst, a compound of the general formulae III, IV or V R1R2R3R4PX (III) R1R2R3P (IV) R1R2R3PO (V) in which R1, R2 and R3 each stand for identical or different alkyl groups or aryl groups having from 1 to 8 carbon atoms, X stands for chlorine or bromine, R4 has the same meaning as R1 through R3 or stands for chlorine or bromine.
-
公开(公告)号：DD247902A5
公开(公告)日：1987-07-22
申请号：DD29032086
申请日：1986-05-16
Applicant: HOECHST AG
Inventor： PIEPER WERNER
Abstract: Novel-1-phenyltetraline-1,4-diphosphonic acids of the formula are made by reacting 1-phenylvinyl-1-phosphonic acids at temperatures of from 120 DEG -210 DEG C.
-
公开(公告)号：NO851975L
公开(公告)日：1985-11-19
申请号：NO851975
申请日：1985-05-15
Applicant: HOECHST AG
Inventor： GROSSE JUERGEN , PIEPER WERNER , GOHLA WERNER
-
公开(公告)号：DD220605A5
公开(公告)日：1985-04-03
申请号：DD26458984
申请日：1984-06-27
Applicant: HOECHST AG
Inventor： PIEPER WERNER
Abstract: The disclosure relates to a process for making derivatives of vinylphosphonic acid or vinylpyrophosphonic acid by reacting a ketone with phosphorus trichloride in the presence of phosphorous acid by using the ketone, phosphorous acid and phosphorus trichloride in a molar ratio of 2:1:1, 1 mol phosphorous acid being replaceable by a further mol phosphorus trichloride and 3 mols water.
-
公开(公告)号：DD202721A5
公开(公告)日：1983-09-28
申请号：DD24109682
申请日：1982-06-25
Applicant: HOECHST AG
Inventor： KRAUSE WERNER , PIEPER WERNER
Abstract: The disclosure relates to process for making derivatives of vinylphosphonic acid or vinylpyrophosphonic acid. To this end, a ketone is reacted with tetraphosphorus hexoxide in the presence of catalytic proportions of a proton-yielding substance. In the event of the products desired to be produced being vinylphosphonic acid derivatives, the vinylpyrophosphonic acid derivatives first obtained are hydrolyzed with an equivalent quantity of water.
-
-
-
-
-
-
-
-
-
Search Results
12
records
(took 0.019 seconds)
