On the Pentaphosphacyclopentadienide Ion, P

✍ Scribed by Prof. Dr. Marianne Baudler; Stilianos Akpapoglou; Dimitrios Ouzounis; Prof. Dr. Fritz Wasgestian; Bernd Meinigke; Prof. Dr. Herbert Budzikiewicz; Helmut Münster

• Publisher: John Wiley and Sons
• Year: 1988
• Tongue: English
• Weight: 270 KB
• Volume: 27
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.198802801

✦ Synopsis

The configuration of C-2 of 8 arises because in the transition state 13 the ester function gives way to the bulky dioxolane ring and therefore occupies exchiuely the exo position (cf., however, Ref. [I]).-If the dioxolane ring in 13 is replaced by the smaller methyl group, i.e., in the transition state of the Wittig rearrangement of the (cis-crotyloxyfacetic ester anion, the ester function is no longer forced completely into the ex0 position. Accordingly, the hydroxy ester resulting in /his case, contrary, to 8 , shows only a 2 : 1 preference for the syn arrangement of the hydroxyl group and the vinyl group [2bj.