Usage of poly-3-hydroxybutyrates in preparation of...

Details Usage of poly-3-hydroxybutyrates in preparation of... Usage of poly-3-hydroxybutyrates in preparation of...

2011-07-26

2011-07-26

Berch, Mark (Department: 1622)

Organic compounds -- part of the class 532-570 series

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

C556S436000, C556S437000

Reexamination Certificate

active

07985857

ABSTRACT:
A method for preparing compounds having the formula(I) by using P(3HB),wherein R isR1, R2, R3are lower linear or branched C1-C4alkyl, comprising the steps of:a: obtaining (3R)-3-RO—CH(CH3)CH2COOCH3by pyrolysis of P(3HB) and protection; b: obtaining (3R)-3-RO—CH(CH3)CH2CHO by reduction of (3R)-3-RO—CH(CH3)CH2COOCH3; c: enolizing (3R)-3-RO—CH(CH3)CH2CHO and then reacting with chlorosulfonyl isocyanate, at last getting the final product by reduction; wherein (3R)-3-RO—CH(CH3)CH2CHO is enolized by reacting (3R)-3-RO—CH(CH3)CH2CHO with isopropenyl acetate and p-toluenesulfonic acid by heating under reflux.

REFERENCES:
patent: 4791198 (1988-12-01), Ohashi et al.

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