En este artículo se aborda el análisis de las implicaciones, consecuencias y riesgos que conllevaría la inclusión del transporte marítimo en el sistema europeo de comercio de derechos de emisión, tanto a nivel ambiental como económico y operativo en los puertos europeos. Se pone el foco, en primer lugar, en aquellos puertos europeos cercanos a puertos extracomunitarios en los límites de la UE y con una componente fronteriza importante al imperar reglas del juego distintas, y, en segundo lugar, en las consecuencias que tendría sobre una posible deslocalización de las actividades portuarias en la reestructuración de las cadenas de suministro y de transporte en la UE.
Aza Analogs of Stilbene with a Dipolar Character. E-1-Alkyl-(2-(azolyl-2-idene)ethylidene)dihydropyridines and E-2-(2-(1-Alkyl-3pyridinium) vinyl)azolate Inner Salts.-The representatives (V) and (IX) of the title compounds are prepared as outlined in the reaction scheme. Knoevenagel reaction of (VI) with ( VII) is improved using a strongly basic ion-exchange resin. Measurements of the dipole moments of the compounds obtained indicate that they can be considered as a new class of push-pull stilbenes with a betain character. -(ALCALDE, E.; ROCA, T.; FAYET, J. P.; VERTUT, M. C.; Chem.
187ChemInform Abstract Deprotonation of the 1-alkyl-4-azolylpyridinium salts (I) and (IV), prepared from the corresponding 4-pyridylazoles by N-alkylation, yields the mesomeric compounds (II) and (III) or (V) and (VI).
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