Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1993-06-24
1994-03-08
Evans, Joseph E.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568 14, 5689095, 568918, 570189, 570217, 570238, C07C 2938, C07C 33025, C07C 1726, C07C 2919
Patent
active
052929736
ABSTRACT:
An improvement is proposed for the removal of the precipitates of a phosphine oxide compound as a by-product from a mixture thereof with an olefin compound obtained by the Wittig reaction for the preparation of the olefin compound from a phosphorane compound and a carbonyl compound. Instead of the conventional procedure of filtration to remove the precipitates, the mixture in a hydrocarbon solvent, after replacement of a non-hydrocarbon solvent with a hydrocarbon solvent, if necessary, is admixed with a lower carboxylic acid such as acetic acid so that the precipitates of the phosphine oxide are dissolved forming a viscous fluid which is immiscible with the mixture of the olefin compound and the hydrocarbon solvent. The fluid containing the dissolved phosphine oxide compound can be easily removed by phase separation so that a great increase is obtained in the yield of the desired olefin compound.
REFERENCES:
patent: 2842599 (1958-07-01), Isler et al.
patent: 3006939 (1961-10-01), Pommer et al.
patent: 3072526 (1963-01-01), Butenandt et al.
patent: 3078256 (1963-02-01), Wittig et al.
patent: 3225106 (1965-12-01), Rabinowitz
patent: 3361785 (1968-01-01), McClure
patent: 4206153 (1980-06-01), Grafen et al.
patent: 4544779 (1985-10-01), Bright
patent: 5089659 (1992-02-01), Brueckner et al.
Fukumoto Takehiko
Yamamoto Akira
Evans Joseph E.
Shin-Etsu Chemical Co. , Ltd.
LandOfFree
Phosphine oxide removal from compounds formed by a Wittig reacti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phosphine oxide removal from compounds formed by a Wittig reacti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phosphine oxide removal from compounds formed by a Wittig reacti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-155319