Studies in the heterophanes field [9]heterophanes of six-membered aromatics

✍ Scribed by A. Marchesini; S. Bradamante; R. Fusco; G. Pagani

• Book ID: 104247455
• Publisher: Elsevier Science
• Year: 1971
• Tongue: French
• Weight: 204 KB
• Volume: 12
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)96527-x

✦ Synopsis

Certain methylene(s) in some l,+hridged five~embered heteroaromatics l-3 have been found to be considerably shielded by the n electron cloud, but the effect is much weaker in a number of l,+bridged six-membered aromatics.

4-6

Observation of strong shielding effects in heterophanes appears to be dependent upon the site of chain junction, chain length, and geometry of the aromatic ring.

In this connection we now report preliminary results of PlIB inveetigation of [912,4_pyridinophane (I) and C9lmetacgclophane (II): new syntheses of (I) and (II) are also outlined.