We have designed, built and tested a hydrogen fuel cell powered vehicle. The vehicle was constructed to specifications set forth for an international competition, which challenges high schools and universities to build and test energy efficient vehicles. We use a commercially available polymer exchange membrane (PEM) fuel cell system with a maximum output of 1.2 kW (1.6HP). The three-wheeled vehicle has a welded frame design utilizing aluminum square tubular components, an Ackermann steering system and an aerodynamically efficient hand-molded fiberglass body. A hub motor/controller powers the single rear wheel. Vehicle performance was determined in the laboratory. Performance curves for fuel consumption, torque and efficiency are presented. The vehicle successfully competed in the hydrogen fuel cell division of the competition.
We describe the synthesis of a family of chiral, nonracemic 3,4-disubstituted 2-N-oxazolidinoyl-1,3-dienes (10 and 15a−15i) via Stille− Furstner coupling. These chiral dienes were converted to the corresponding iron(0) tricarbonyl complexes (11 and 16a−16i) with good to high diastereoselectivity (3:1 to >15:1). The combined chemical yields of these steps, as well as the complexation diastereoselectivities, were generally superior to the analogous chiral 2-sulfinyl-1,3-dienes we reported earlier. Stereochemical assignments of the diene iron(0) tricarbonyl complexes were facilitated by X-ray crystallography and circular dichroism, and a computational search for the lowest energy confirmation of 10 was undertaken to understand the origin of the complexation diastereoselectivity. Complexes 16b and 16e were each carried through synthetic pathways that included RCM to make an initial comparison of the reactivity of this family of diene iron tricarbonyl complexes with the previously reported sulfinyl-1,3-diene iron(0) tricarbonyl complexes. Sidechains of complexes 43 and 44 were each modified for introduction of an α-diazoester unit, and diastereoselective Rh 2 (OAc) 4 -catalyzed intramolecular C−H insertions were carried with to afford pentacyclic complexes 48 and 49. Demetallation of 48, subsequent elaboration of the oxazolidinoyl diene, and intramolecular aza-Michael gave fused N-Ts pyrrolidine 54 as a single diastereomer.
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