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245	1	0	_aA Rapid and Convenient Technique for converting Ketones into their Ethylenedioxy- or Trimethylenedioxy-derivatives, and for making Acetonides
490	0		_vJournal of Chemical Society Perkin Transation 1, p.158-160, 1979
520	3		_aThe ethylenedioxy-derivatives (ethylene acetals)of unhindered steroid. triterpene. and other ketones can be prepared by running a mixture of the ketone and ethylene glycol in tetrahydrofuran through an acid ion-exchange column and isolating the derivative from the eluate. This technique is particularly appropriate where such compounds are to be subjected to mass spectrometry but can also be used on a larger scale in synthetic sequences where protection of the carbonyl group is desired. The homologous (cyc!ic trimethylenedioxy-)derivatives. better for the latter purpose in certain cases. can be prepared in the same way. as can the acetonides of 1.3-dihydroxycompounds.
700	1	2	_aDann. A.E.
700	1	2	_aDavis. J.B.
700	1	2	_aNagler, M.J.
856	4	0	_uhttps://drive.google.com/file/d/1hKxQOyGV8CeEKvTtXh6zccN5WqBxP1Mq/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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