Os. Maslennikova et al., Cycloaddition of dialkylgermoles: synthesis and structures of 2,2,3,3-tetracyano-1,4,5,6-tetraphenyl-7-germanorborn-5-enes, RUSS CHEM B, 49(7), 2000, pp. 1275-1281
Cycloaddition reactions of 1,1-dicyclopropyl-2,3,4,5-tetraphenyl-1-germacyc
lopentadiene (3) with dehydrobenzene, tetracyanoethylene, cyclooctyne, or d
imethyl acetylenedicarboxylate as well as of 1,1-dimethyl-2,3,4,5-tetraphen
yl-1-germacyclopentadiene (4) and 2,3,4,5-tetraphenyl-1-germacyclopentadien
e (5) with tetracyanoethylene or cyclooctyne were studied. Diels-Alder addu
cts of germoles 3, 4, and 5 with tetracyanoethylene were prepared. The stru
ctures of these adducts were established by X-ray diffraction analysis and
their thermal and photochemical stabilities were examined.