Synthesis and Characterization of the First Double-Bridged Tetraselenafulvalenophanes
摘要:
Recrystallization of the isomeric mixtures of 1 a and 1 b obtained by synthesis gave single crystals of the cis-trans and cis-cis isomers, respectively. The unique stacked structures of these compounds were elucidated by X-ray structure analysis.
The four-component cyclization of dilithium acetylide with dithiocyanatoalkanes yielded the hitherto unknown tetrathiacyclodiynes 34, 38, 41, and 43 in moderate yields. The use of the trimethylsilyl protecting group allowed a more efficient and flexible stepwise approach with good yields. The resulting tetrathiacyclodiynes 25−44 were investigated by X-ray analysis. For ring systems with a twist-chair
Recrystallization of the isomeric mixtures of 1 a and 1 b obtained by synthesis gave single crystals of the cis-trans and cis-cis isomers, respectively. The unique stacked structures of these compounds were elucidated by X-ray structure analysis.