C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 43/184 (2006.01) C07C 43/305 (2006.01) C07C 45/51 (2006.01) C07C 45/85 (2006.01) C07C 49/39 (2006.01) C07C 49/707 (2006.01) C07D 493/10 (2006.01)
Patent
CA 2092353
ABSTRACT OF THE DISCLOSURE Bisketals of 1,3-cyclobutanedione with monovalent and divalent alcohols are disclosed as well as processes for their production from 1,3-cyclobutanedione or from 3- acetoxy-2-cyclobuten-1-one contained in the distillation residues of the diketene production. The bisketals are suitable intermediate products for the production of squaric acid, for the production and/or purification of 1,3-cyclobutanedione, or as a stable form for storage or substitute for this unstable dione. The 1,3- cyclobutanedione-bisketals according to the present invention have the general formula Image (I) wherein either R1a , R1b , R3a and R3b are the same and each represents a linear or branched lower alkyl group, or R1a and R1b are the same and R3a and R3b are the same and form a five-membered or six-membered spiro-linked ring with the ketal-oxygen atoms and the intermediate carbon atom, respectively, with the cyclobutane ring optionally substituted by one or more lower alkyl groups.
G. Ronald Bell & Associates
Lonza Ltd.
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