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The crystal structures of two endo-endo-dienes, 5,6,7,8,9,9-hexachloro-1,4,4a,5,8,8a-hexahydro-endo-endo-1,4-ethano (and propano)-5,8-dimethanonaphthalene, 1band 1chave been determined. These, together with the methano-homolog 1a(of known structure), are shown to exhibit decreasing across-space double-bond/double-bond repulsion which correlates with the observed decrease in the ease of cyclization in solution.

Fourteen acylhydrazides such as (II) are condensed with pyridoxal (I), salicylaldehyde (IV), and hydroxynaphthaldehyde (VI) to give 42 acylhydrazones of type (III), (V) and (VII), respectively, of which 38 are new.