Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Reexamination Certificate
2005-07-05
2005-07-05
Saeed, Kamal A. (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
Reexamination Certificate
active
06914153
ABSTRACT:
A process for the preparation of alkylidene substituted succinates comprising a step (a) in which is carried out the reaction of a carbonilic compound, a succinic and a base in a reaction medium and a step (b) in which the alkylidene substituted product obtained in (a) is esterified, characterized in that the succinic ester is used in a molar amount substantially equal to, or lower than, the amount of compound carbonilic compound, (ii) the base is used in a molar amount substantially equal to the succinic ester and is selected from metal hydrides and metal and alkoxides, and (iii) the reaction medium comprises an aprotic liquid medium or a protic liquid medium having a Ka, measured in water, lower than that of iPrOH.
REFERENCES:
patent: 800227 (1950-10-01), None
patent: 760355 (1997-03-01), None
C. G. Overberger et al., “The Preparation of2-Alkyl-1, 4-butanediols;”J. Am. Chem. Society; vol. 71 (3618-21) 1949.
G. H. Daub et al., “The Stobbe Condensation with Sodium Hydride;”J. Am. Chem. Society; vol. 72 (501-4) 1950.
B. Wojcik et al., “Alkylation of Acetoacetic, Malonic and Succinic Esters,”J. Am. Chem. Society; vol. 56 (2424-25) 1934.
N. R. Guirguis et al., “Synthesis of Enol Lactones of 3-Aroyl-2-(thienylmethylene)-propionic Acids and their Conversion into the Corresponding 4-Arylbenzo[b]thiophene-6-carboxylic Acids;”Liebigs Ann. Chem.; vol. 6 (1003-1011) 1986.
A. Basak et al., “Novel Regioselective Ester Hydrolysis by Pig-Liver Esterase;”Bull. Chem. Soc. of Japan; vol. 70 (2509-2513) 1997.
W. S. Johnson et al., “Organic Reactions;”The Stobbe Condensation; vol. VI, Chapter 1 (50-72) 1951; John Wiley & Sons Inc., NY.
H. Stobbe et al., “Die Dibenzalbernsteinsaure,”Ber., 37 (2240-2249) 1904 (German).
H. Stobbe, “Die Farbe der Fulgensauren und Fulgides,”Ber., 38 (3673-3682) 1905 (German).
Cristofori Antonio
Fachini Marco
Gulevich Yuri
Morini Giampiero
Prini Giansiro
Bassell Poliolefine Italia S.p.A.
Saeed Kamal A.
LandOfFree
Process for preparing alkylidene substituted succinic acid... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparing alkylidene substituted succinic acid..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing alkylidene substituted succinic acid... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3401694