... Soc. Chim. Belg. vd. 99 I no 9 I 1990 EUROPEAN SECTION 0037-9646 I90 I $2.00 + 0.00 Q 1990 ComM van Beheer van het Bulletin v.2.w Lecture given at the XiVth European Colloquium on Heterocyclic Chemistry CSIC and Universldad Aut6noma de Madrid. ... 680 - Page 9. ...