Accepted Manuscript Regio- and stereoselective cleavage of steroidal 22-oxo-23-spiroketals cata- lyzed by BF 3 ·Et 2 O Alejandro Corona Díaz, J. Pablo García Merinos, Yliana López, J. Betzabe González Campos, Rosa E del Río, Rosa Santillan, Norberto Farfán, Jacek W. Morzycki PII: S0039-128X(15)00133-6 DOI: http://dx.doi.org/10.1016/j.steroids.2015.04.004 Reference: STE 7777 To appear in: Steroids Received Date: 24 November 2014 Revised Date: 5 April 2015 Accepted Date: 14 April 2015 Please cite this article as: Díaz, A.C., Pablo García Merinos, J., López, Y., Betzabe González Campos, J., Río, R.E.d., Santillan, R., Farfán, N., Morzycki, J.W., Regio- and stereoselective cleavage of steroidal 22-oxo-23-spiroketals catalyzed by BF 3 ·Et 2 O, Steroids (2015), doi: http://dx.doi.org/10.1016/j.steroids.2015.04.004 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.