I. SYNTHESIS OF (4.2.2), (4.2.1), AND (3.3.1) PROPELLANES. II. SOLVENT EFFECTS IN THE REACTION OF DIETHYLMALONATE ANION WITH STYRENE OXIDE. III.SYNTHESIS OF FIVE-MEMBERED AND SIX-MEMBERED OXYGEN AND SULFUR HETEROCYCLES VIA CONCOMITANT MICHAEL AND DIECKMANN CONDENSATIONS.