1025-13-4Relevant academic research and scientific papers
REGENERATION OF A HYDROFORMYLATION CATALYST DURING HYDROFORMYLATION
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Page/Page column 16-17, (2011/04/14)
A method for hydroformylating or hydrocarbonylating a substrate having a carbon-carbon double or triple bond or both is described. The method comprises exposing the substrate to a hydroformylation catalyst under an atmosphere comprising carbon monoxide and hydrogen in the presence of a regeneration reagent so as to form a product. The regeneration reagent is such that it is capable of at least partially reversing poisoning of the hydroformylation catalyst by a diene or an alkyne or both.
Methyleneketones and Methylenecarbenes. XVI. The Formation of Diphenylfuran-2-ones and 3-Phenylphthalide as Minor Products of the Pyrolysis of Diphenylmethyl Propiolate
Brown, Roger F. C.,Eastwood, Frank W.,Chaichit, Narongsak,Gatehouse, Bryan M.,Pfeiffer, Jan M.,Woodroffe, David
, p. 1467 - 1481 (2007/10/02)
The formation of a mixture of lactones as a minor product of the flash vacuum pyrolysis of diphenylmethyl propiolate (1) has been investigated further.The diphenylfuran-2-ones (3), (4), and (5) are shown to be formed through an intramolecular insertion reaction of the methylenecarbene (2), formed from (1) at 640 deg, which leads to 5,5-diphenylfuran-2(5H)-one (3) as the primary product. 3-Phenylphthalide (8) is apparently formed by intramolecular Diels-Alder addition of the CC bond of (1) to one phenyl ring which acts as the diene component, followed by loss of acetylene from an intermediate barrelene derivative (10).This is confirmed by a deuterium labelling experiment. 1-Phenyl-2-benzoxepin-3(1H)-one (7), considered at first as a possible intermediate in the pyrolysis of (1), is synthesized in six steps from 2-aminobenzophenone, and its X-ray structure determination is reported.On pyrolysis at 640 deg/0.07 mm (7) decarbonylates smoothly to give 2-vinylbenzophenone.
