Page 1. SYNTHETIC COMMUNICATIONS, 26( 16), 2999-3006 (1996) SILICA GEL PROMOTED SELECTIVE HYDROLYSIS OF ... 557)9-10. The classical synthetic methods of the skeleton were the selective ... 16. Xia, P.; Zhang, Z. G.; Yuan, S. Y. Youji Huaxue 1989,9, 448. 17. ...