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Myers Stereoselective Olefination Reactions: The Wittig ...
hwpi.harvard.eduretrosynthetic analysis of trisubstituted olefins: • Phosphonium ylides react with aldehydes to produce oxaphosphetane 1Z or 1E, which decomposes by a syn-cycloreversion process to the alkene. In the formation of Z-alkenes, an early, four-centered transition state …
Challenges in Public Procurement: A Comparative …
www.ippa.org22 WITTIG & JENG continued improvements in local infrastructure projects. Funded through a World Bank program, The Gambia Public Procurement Authority1 (GPPA) was established as the focal point for improvement in this area of public