Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Reexamination Certificate
2007-10-30
2007-10-30
Zucker, Paul A. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
Reexamination Certificate
active
10813696
ABSTRACT:
The present invention relates to a process for the preparation of esters of hydroxy tiglic aldehydes which are the key intermediates for Vitamin-A acetate synthesis and various perfumistic products, said process relates to the hydroformylation of biscarboxylic esters of but-2-ene-1,4-diol, followed by deacetoxylation of its hydroformylation compound, in the presence of heterogeneous catalyst having rhodium complex entrapped, anchored or teethered on the acidic support, said acidic support causes deacetoxylation in the reaction mixture immediately after hydroformylation, to give 100% selectivity to the carboxylic esters of hydroxyl tiglic aldehydes in a single step.
REFERENCES:
patent: 4124619 (1978-11-01), Fitton et al.
El Ali et al, Abtracts of Papers 224th ACS National Meeting, Boston, MA, Hydroformylation and Acetalization of Styrene Derivatives Catalyzed by Rh(III)-phosphite and Rh(III) Supported on MCM-41-phosphite Systems,2002.
Chansarkar Rashmi
Chaudhari Raghunath Vitthal
Kelkar Ashutosh Anant
Mukhopadhyay Kausik
Council of Scientific & Industriual Research
Morgan & Finnegan L.L.P.
Zucker Paul A.
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